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A Preliminary Study on Dynamics and Models of N,P,K Absorption for High-Yield Cotton 被引量:6
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作者 WANGKe-ru LIShao-kun +3 位作者 CAOLian-pu SONGGuang-jie CHENGang CAOSuan-zhu 《Agricultural Sciences in China》 CAS CSCD 2003年第7期752-759,共8页
The field experiments were carried out to investigate the dynamics and models of N, P and K absorption for the cotton plants with a lint of 3 000 kg ha-1 in Xinjiang. The main results were as follows: The contents of ... The field experiments were carried out to investigate the dynamics and models of N, P and K absorption for the cotton plants with a lint of 3 000 kg ha-1 in Xinjiang. The main results were as follows: The contents of N, P2O5, K2O in cotton leaves, stems, squares and bolls decreased obviously with the time over the whole growth duration and the falling extent was greater in high-yield cotton than in CK. Contents of N in leaves, squares and bolls, in particular in the leaves of fruit-bearing shoot was higher in high-yield cotton than in CK. Contents of P2O5 in squares and bolls and that of K2O in stems were higher in high-yield cotton than in CK during the whole growing period. The accumulations of N, P2O5 and K2O in the cotton plants could be described with a logistic curve equation. There was the fastest nutrient uptake at about 90 d for N, 92 d for P2O5 and 85 d for K2O after emergence, respectively. Total nutrient accumulation of N, P2O5 and K2O was 385.8, 244. 7 and 340.3 kg ha-1, respectively. Approximately 12. 5 kg N, 8. 0 kg P2O5 and 11.1 kg K2O were needed for producing 100 kg lint with the leaves and stems under the super high yield condition of 3 000 kg ha-1 in Xinjiang. 展开更多
关键词 XInJIAnG Cultivation of high yield COTTOn n p k Absorption dynamics Model
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Macronutrients Uptake in Soybean as Affected by <i>Bradyrhizobium japonicum</i>Inoculation and Phosphorus (P) Supplements
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作者 Eutropia V. Tairo Patrick A. Ndakidemi 《American Journal of Plant Sciences》 2014年第4期488-496,共9页
Field and glasshouse experiments were conducted to study the effect of B. japonicum inoculation and phosphorus supplementation on macronutrient uptake by soybean. The treatments consisted of B. japonicum inoculation (... Field and glasshouse experiments were conducted to study the effect of B. japonicum inoculation and phosphorus supplementation on macronutrient uptake by soybean. The treatments consisted of B. japonicum inoculation (with & without), phosphorus supplementation at the levels of 0, 20, 40 and 80 kg P·ha-1. Both treatments were replicated four times in a split plot design. The macronutrients considered were N, P, K, Ca and Mg. Results showed that inoculation with B. japonicum significantly contribute to the uptake of N, P, K, Ca and Mg in roots, shoots, pods and the whole soybean plant. Likewise, phosphorus supplementation significantly enhanced the uptake of N, P, K, Ca and Mg in roots, shoots, pods and the whole plant. The use of effective strains of rhizobia and P supplementation was an effective way of enhancing the growth of soybean, eventually the uptake of macronutrients in plant organs. 展开更多
关键词 Legumes plant nutrients nitrogen (n) pHOSpHORUS (p) potassium (k) Calcium (Ca) Magnesium (Mg)
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Plant Biomass, Primary Production and Mineral Cycling of a Mixed Oak Forest in Linnebjer, Sweden
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作者 Folke O. Andersson 《Open Journal of Forestry》 2014年第5期570-580,共11页
Plant biomass, primary production and mineral cycling were studied in a mixed deciduous forest (Quercus robur L., Tilia cordata L. and Corylus avellana L.) in southern Sweden. Plant biomass amount above and below grou... Plant biomass, primary production and mineral cycling were studied in a mixed deciduous forest (Quercus robur L., Tilia cordata L. and Corylus avellana L.) in southern Sweden. Plant biomass amount above and below ground was 201 and 37 t&middotha-1, respectively. Primary production above and below ground was an estimated 13.3 and 2.3 t&middotha-1, respectively. Carbon was the dominant element in the forest ecosystem, comprising 133 t&middotha-1. Other major elements were: N > Ca > K > Si > Mg > S > Mn > P > Fe and Na (range 1123 to 18 kg&middotha-1), followed by some trace elements. Yearly litterfall restored 6.0 t&middotha-1 organic matter or 2.3 t&middotha-1 carbon. Approximately 45% decomposed and returned to the soil during the year. Monitoring of other elements revealed that the ecosystem received inputs through dry and wet deposition, in particular 34.4 kg&middotha-1 S and 9.4 kg&middotha-1 of N yearly as throughfall. Determination of yearly biomass increase showed that the oak forest ecosystem was still in an aggradation or accumulation phase. 展开更多
关键词 plant BIOMASS pRIMARY production LITTERFALL DEpOSITIOn CYCLInG of C n p k S
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Effects of Amino Acids Replacing Nitrate on Growth,Nitrate Accumulation,and Macroelement Concentrations in Pak-choi (Brassica chinensis L.) 被引量:12
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作者 WANG Hua-Jing WU Liang-Huan +3 位作者 WANG Min-Yan ZHU Yuan-Hong TAO Qin-Nan ZHANG Fu-Suo 《Pedosphere》 SCIE CAS CSCD 2007年第5期595-600,共6页
A hydroponic experiment was carried out to determine the influence of replacing 20% of nitrate-N in nutrient solutions with 20 individual amino acids on growth, nitrate accumulation, and concentrations of nitrogen (N... A hydroponic experiment was carried out to determine the influence of replacing 20% of nitrate-N in nutrient solutions with 20 individual amino acids on growth, nitrate accumulation, and concentrations of nitrogen (N), phosphorus (P), and potassium (K) in pak-choi (Brassica chinensis L.) shoots. When 20% of nitrate-N was replaced with arginine (Arg) compared to the full nitrate treatment, pak-choi shoot fresh and dry weights increased significantly (P ≤ 0.05), but when 20% of nitrate-N was replaced with alanine (Ala), valine (Val), leucine (Leu), isoleucine (Ile), proline (Pro), phenylalanine (Phe), methionine (Met), aspartic acid (Asp), glutamic acid (Glu), lysine (Lys), glycine (Gly), serine (Ser), threonine (Thr), cysteine (Cys), and tyrosine (Tyr), shoot fresh and dry weights decreased significantly (P ≤ 0.05). After replacing 20% of nitrate-N with asparagine (Asn) and glutamine (Gin), shoot fresh and dry weights were unaffected. Compared to the full nitrate treatment, amino acid replacement treatments, except for Cys, Gly, histidine (His), and Arg, significantly reduced (P ≤0.05) nitrate concentrations in plant shoots. Except for Cys, Leu, Pro, and Met, total N concentrations in plant tissues of the other amino acid treatments significantly increased (P ≤ 0.05). Amino acids also affected total P and K concentrations, but the effects differed depending on individual amino acids. To improve pak-choi shoot quality, Gln and Asn, due to their insignificant effects on pak-choi growth, their significant reduction in nitrate concentrations, and their increase in macroelement content in plants, may be used to partially replace nitrate-N. 展开更多
关键词 amino acids GROWTH n p and k nitrate accumulation pak-choi
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Effect Models of Nitrogen,Phosphorus and Potassium Fertilizer Formulation in Banana 被引量:1
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作者 匡石滋 田世尧 +3 位作者 李春雨 易干军 洪炎龙 万国富 《Agricultural Science & Technology》 CAS 2010年第9期130-135,共6页
[Objective] The aim was to modify the application amount of N,P and K fertilizer so as to provide a reference for establishing balanced fertilization index system of banana.[Method]The N,P and K fertilizer "3414" te... [Objective] The aim was to modify the application amount of N,P and K fertilizer so as to provide a reference for establishing balanced fertilization index system of banana.[Method]The N,P and K fertilizer "3414" test was carried out on banana,and then regression analysis was performed on the fertilizer effect.Ternary quadratic,binary quadric and one-variable quadratic regression equations for the fertilizer effect on the banana yield were constructed.[Result]Suitable amount of N,P and K fertilizer had significant yield improving effect,whereas overdose of fertilizer application led to decreasing of utilization rate of fertilizer.Therefore,suitable amount of N,P and K fertilizer should be selected in production.It could be concluded that one-variable quadratic regression equations was the best model to calculate the suitable fertilizer amount.The best yield range of banana in the tested field was 44.193-45.904 t/hm2,while the corresponding optimum application amount of N,P2O5 and K2O was 795.1,262.3 and 1 236.9 kg/hm2 respectively,and the ratio among nitrogen,phosphorus and potassium are 1∶0.33∶1.55.[Conclusion]The result in this study could provide references for the soil types similar to the tested field. 展开更多
关键词 BAnAnA nITROGEn phosphorus and potassium fertilization Fertilizer application model Optimum application amount
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Effects of Nitrogen,Phosphorus and Potassium Application on Growth and Dry Matter Accumulation in Mulberry 被引量:1
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作者 刘刚 黄盖群 +5 位作者 殷浩 张建华 朱永群 危玲 佟万红 林超文 《Agricultural Science & Technology》 CAS 2013年第6期899-904,共6页
In this paper, the effect of different fertilizer treatments on the main indexes of growth and development and dry matter accumulation of perennial mulberry, which is cut and pruned in summer, were studied with ‘3414... In this paper, the effect of different fertilizer treatments on the main indexes of growth and development and dry matter accumulation of perennial mulberry, which is cut and pruned in summer, were studied with ‘3414’ field experiment design. The results showed that N, P, and K at proper amounts could promote mulberry growth and development, improve its dry matter content, increase its dry matter accumulation. The effects of N, P, K on leaf yield per plant were respectively expressed as follows: N2 N3 N1 N0 , P2 P1 P3 P0 , K2 K1 K3 K0 . It can be concluded that the recommended fertilizer amounts of dry matter accumulations in mulberry leaf were 694.36 kg/hm2 of N, 198.15 kg/hm2 of P, and 274.26 kg/hm2 of K and the dry matter achieved the maximum at 8 045.04 kg/hm2 . The recommended fertilizer amounts of accumulated dry matter in branch were 1 000.05 kg/hm2 of N, 242.04 kg/hm2 of P, and 218.01 kg/hm 2 of K, and the dry matter achieved the maximum at 5 969.05 kg/hm2 . The recommended fertilizer amount in young shoots were 883.76 kg/hm2 of N, 204.48 kg/hm2 of P and 426.59 kg/hm2 of K and dry matter achieved the maximum at 1 410.24 kg/hm2 . This paper could provide reference for the construction of highly-qualified mulberry field in Sichuan hilly area. 展开更多
关键词 MULBERRY n p and k Fertilization Fertilizer amount Growth and development Dry matter accumulation
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Effects of N, P and K on Output and Nutrient Cycle of Vegetables in Greenhouses
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作者 朱静华 李玉华 +1 位作者 李明悦 高伟 《Agricultural Science & Technology》 CAS 2013年第7期1011-1016,共6页
ObjectiveThe aim was to increase farmers’ income and reduce the waste of fertilizer by exploring effects of N, P and K fertilizations on vegetable yields and the accumulation of N, P and K in vegetable and soils. Met... ObjectiveThe aim was to increase farmers’ income and reduce the waste of fertilizer by exploring effects of N, P and K fertilizations on vegetable yields and the accumulation of N, P and K in vegetable and soils. MethodThe fertilization tests were conducted on tomato, cauliflower and celery in greenhouses. ResultWhen N, P and K were not applied in tomato, cauliflower or celery, the yields reduced in 6.0%-13.8% and total annual income reduced by 39 220, 36 902 and 22 023 yuan/hm 2 respectively, suggesting that N, P and K are limiting factors of yield. The absorbed N amounts of tomato and cauliflower were higher compared with celery; the absorbed P amount of cauliflower was higher compared with tomato and celery; the absorbed K amount of tomato was the highest, followed by celery and cauliflower. The absorbed N in tomato fruit was lower than that of cauliflower and the absorbed N amount of other parts of tomato was also lower. Furthermore, the absorbed amounts of P and K by tomato and cauliflower fruits were higher than it absorbed by the other parts, especially the absorbed of K was significantly high. Total absorbed amounts of N, P and K from high to low were cauliflower, tomato and celery. After harvesting of tomato, cauliflower and celery, N, P and K in soils were all higher compared with soils before planting. Influenced by fertilizers, residual N content in soils grown with tomato and residual P content in soils grown with celery both doubled compared with base soils. Cauliflower plants were not applied with organic fertilizer, and residual N and K contents in soils were lower compared with tomato and celery. ConclusionResidual P content in soils is higher, which is a kind of waste and would cause pollution on soils. It is necessary to improve the proportion of organic and inorganic fertilizers in fertilization. 展开更多
关键词 Rotation system of greenhouse vegetable YIELD n uptake p uptake k uptake Soil residues
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Effects of N,P and K Fertilizers on Growth of Clover Nitrogen-fixing Rhizobia and Soil Fertility after Plantation
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作者 刘亚柏 朱庆锋 +1 位作者 毕道杰 王润芳 《Agricultural Science & Technology》 CAS 2016年第4期906-911,915,共7页
In order to develop organic rice and increase paddy soil fertility by cloverorganic rice rotation, the effects of N, P and K fertilizers on growth of clover nitrogen-fixing rhizobia and soil fertility after plantation... In order to develop organic rice and increase paddy soil fertility by cloverorganic rice rotation, the effects of N, P and K fertilizers on growth of clover nitrogen-fixing rhizobia and soil fertility after plantation were investigated, thereby providing certain reference for reasonable cultivation of clover and improvement of soil fertility. A two-year experiment was conducted from 2012 to 2013. The clover was cultivated after rice every year, and different levels of N, P and K fertilizers were applied before winter. In the treatment group, no fertilizer was applied. The effects of different fertilizers and different application amounts on clover yield, nitrogen-fixing rhizobia quantity, nitrogen-fixing rhizobia weight and soil fertility after plantation were analyzed. The results showed that the application of N, P and K fertilizers in the early stage had significantly effect on the growth of clover. When the application amount of N fertilizer was 75 kg/hm^2(N 46%), the clover yield, nitrogen-fixing rhizobia quantity and nitrogen-fixing rhizobia weight were highest. The soil nitrogen content after plantation increased with the increase of the application amount of N fertilizer, while the P and K content decreased and then increased with the increased application amounts. Soil available P content increased with the increased application amounts of N and P fertilizers, but it did not change significantly with the increased application amount of K fertilizer. Soil available K content increased first and then decreased with the increased application amounts of N and P fertilizers.When the application amounts of N and P fertilizers were 150(N 46%) and 300(P_2O_5 12%) kg/hm^2, soil available K content reached the maximum. Soil organic matter content increased with the increased application amounts of N, P and K fertilizers. Therefore, in the cultivation of clover, appropriate application of N, P and K fertilizers in the early stage can improve clover yield and soil fertility. 展开更多
关键词 n fertilizer p fertilizer k fertilizer CLOVER nitrogen-fixing rhizobia Soil fertility
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云南松苗木N、P、K元素含量间异速生长关系对N、P添加的响应 被引量:2
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作者 陆庄跃 汪梦婷 +4 位作者 贺斌 汪啟波 许玉兰 李伟 蔡年辉 《西北林学院学报》 CSCD 北大核心 2024年第3期26-34,共9页
为了解云南松苗木不同器官N、P、K的分布特征,分析云南松不同器官N、P、K含量间的分配差异,进一步探讨各器官N、P、K元素间的异速生长关系。采用N、P二因素三水平的方法开展不同施肥试验,并对苗木采样测定,研究云南松苗木N、P、K元素含... 为了解云南松苗木不同器官N、P、K的分布特征,分析云南松不同器官N、P、K含量间的分配差异,进一步探讨各器官N、P、K元素间的异速生长关系。采用N、P二因素三水平的方法开展不同施肥试验,并对苗木采样测定,研究云南松苗木N、P、K元素含量间异速生长关系对N、P添加的响应。结果表明,云南松苗木对N、P、K在不同器官间具有不同的分配策略,总体K变动较小,N、P波动较大且相似,在各器官中N、K分配表现为萌条>叶>茎>根;P表现为萌条>茎>叶>根。与对照相比,单施N、P和N、P配施均对云南松苗木生长的影响产生一定差异,总体来看N、P配施更能促进苗木的养分合理分配,有效缓解单施N、P对植株的限制作用,使养分处于一个平衡状态,进而促进苗木的生长。随施肥时间的推移,各器官营养元素间的异速生长关系也随之发生变化,且各器官表现为N、P的积累速度相接近,总体表现为K的积累速度低于N、P。总体而言,随施肥时间的改变,云南松苗木各器官之间元素的异速生长轨迹发生了显著变化,形成不同的营养元素分配模式。 展开更多
关键词 云南松 np添加 营养元素 养分分配策略 异速生长关系
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A Threshold Scheme under Peer-to-Peer Network
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作者 XIE Yumin SHI Feng +2 位作者 MING Yang MUHAMMAD Kamran XU Jianqiang 《Wuhan University Journal of Natural Sciences》 CAS 2006年第6期1741-1744,共4页
Resource sharing among peers is one of important application in Peer-to-Peer(P2P) network. Inexistenee of server makes P2P network to be a less trustable tool for property owners to distribute their resource. In ord... Resource sharing among peers is one of important application in Peer-to-Peer(P2P) network. Inexistenee of server makes P2P network to be a less trustable tool for property owners to distribute their resource. In order to protect intelligent property, reputation management strategy is adopted in many P2P network. As long as a P2P network reputation strategy is confirmed, application designer can employ a special detailed distribution scheme to fulfill content distribution within the net. Shmir (k, n) threshold scheme, for example, is an encryption scheme to enhance the distribution se curity of this kind of design. (k*, n) threshold scheme is a new tool similar to Shmir scheme is proposed in this paper. The new scheme based on polynomial expansion and its security is decided by the one way function used in the secret distribution procedure. The scheme efficiency and its features as well as comparison between new and Shmir scheme are also discussed in this paper. 展开更多
关键词 k n threshold scheme p2p k n threshold scheme reputation management
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GENERALIZED FORELLI-RUDIN TYPE OPERATORS BETWEEN SEVERAL FUNCTION SPACES ON THE UNIT BALL OF C^(N) 被引量:1
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作者 Xuejun ZHANG Yuting GUO +1 位作者 Hongxin CHEN Pengcheng TANG 《Acta Mathematica Scientia》 SCIE CSCD 2024年第4期1301-1326,共26页
In this paper,we investigate sufficient and necessary conditions such that generalized Forelli-Rudin type operators T_(λ,τ,k),S_(λ,τ,k),Q_(λ,τ,k)and R_(λ,τ,k)are bounded between Lebesgue type spaces.In order t... In this paper,we investigate sufficient and necessary conditions such that generalized Forelli-Rudin type operators T_(λ,τ,k),S_(λ,τ,k),Q_(λ,τ,k)and R_(λ,τ,k)are bounded between Lebesgue type spaces.In order to prove the main results,we first give some bidirectional estimates for several typical integrals. 展开更多
关键词 Forelli-Rudin type operator L^(p q s k)(B_(n))space BOUnDEDnESS unit ball
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Effects of Regulation of C/N Ratio Wheat Straw Application on Nitrogen,Phosphorus and Potassium Uptake in Tobacco 被引量:13
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作者 段宗颜 王瑞宝 +3 位作者 鲁耀 殷寿安 胡万里 陈拾华 《Agricultural Science & Technology》 CAS 2010年第5期77-81,共5页
[Objective]The aim was to study the effects of regulation of C/N ratio wheat straw application on tobacco nitrogen,phosphorus and potassium uptake. [Method]Effects of regulation C/N ratio wheat straw application on th... [Objective]The aim was to study the effects of regulation of C/N ratio wheat straw application on tobacco nitrogen,phosphorus and potassium uptake. [Method]Effects of regulation C/N ratio wheat straw application on the flue-cured tobacco yield,output value,nitrogen,phosphorus and potassium content and cumulative uptake of the upper,middle and bottom leaf were studied by using the field plot experiments at Banqiao town,Qujing city,Yunnan Province during the 2008-2009 summer growing seasons. [Result]The results showed that the application of wheat straw alone or after C/N regulation,could significantly increase tobacco production,potassium content,the potassium and nitrogen accumulation amount of leaf,and was more conducive to the potassium uptake of tobacco leaf with wheat straw application after C/N regulation. Compared with non-straw application,the yield of tobacco increased by 6.59%,3.58%,5.98%,8.80% with application of wheat straw alone,wheat straw and vetch,wheat straw and oilseed cake,wheat straw and urea nitrogen,the potassium content in tobacco leaf increased by 3.85%,7.76%,8.82%,11.21%,respectively,the total potassium cumulative amount of leaf increased by 10.71%,11.62%,15.32% ,21.01% and the total nitrogen cumulative amount increased by 9.76%,1.22%,8.14%,14.00%. However,the differences of tobacco leaf nitrogen content among the different treatments were not significant,the phosphorus uptake of tobacco leaf decreased. [Conclusion]application of high C/N ratio wheat straw in flue-cured tobacco production,which should be concerned not only to adjust C/N ratio by adding nitrogen,but also considering additional phosphorus application. 展开更多
关键词 Wheat straw C/n ratio regulation Flue-cured tobacco n p k uptake
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Spatial Distribution of Soil Total Nutrients of Farmland in Liaoning Province 被引量:14
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作者 吕国红 张玉书 +2 位作者 陈鹏狮 纪瑞鹏 焦晓光 《Agricultural Science & Technology》 CAS 2010年第1期154-158,共5页
[Objective]The aim was to reveal the spatial distribution characteristics of total nutrients in soil and provide a theoretical basis for farmland management and improvement of crop yield. [Method]GIS technique was use... [Objective]The aim was to reveal the spatial distribution characteristics of total nutrients in soil and provide a theoretical basis for farmland management and improvement of crop yield. [Method]GIS technique was used to analyze the spatial distribution characteristics of total C,total N,total P and total K for different soil layers in Liaoning Province. [Result]The results showed that the content of total C,total N,total P decrease from east to west,but the content of total K was high in north district of Liaoning Province. The content of total C,total N,total P and total K was higher in soil surface (0-20 cm) than the lower (20-40 cm). Total K varied less with soil depth,and its mean content was respectively 17.64 g/kg and 17.08 g/kg for soil surface and soil lower layer. [Conclusion]The results of the distribution of soil total nutrients in different soil layers supplied a theory basis for farmland management. 展开更多
关键词 Total C Total n Total p Total k Spatial distribution
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N P K施用量与芹菜硝酸盐积累和产量的相关性 被引量:49
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作者 刘明月 秦玉芝 +1 位作者 蔡雁平 何长征 《中国蔬菜》 北大核心 1998年第6期4-7,共4页
采用三因素五水平通用旋转组合设计,对N、P、K施用量与芹菜硝酸盐积累和产量的相关性进行了研究,并建立了三元二次回归方程。结果表明:N肥的施用与芹菜体内硝酸盐积累呈正相关,P、K肥的施用与之呈负相关;N、P、K皆有利于... 采用三因素五水平通用旋转组合设计,对N、P、K施用量与芹菜硝酸盐积累和产量的相关性进行了研究,并建立了三元二次回归方程。结果表明:N肥的施用与芹菜体内硝酸盐积累呈正相关,P、K肥的施用与之呈负相关;N、P、K皆有利于芹菜产量的形成,作用大小的顺序为N>P>K;三元素在影响芹菜硝酸盐积累及产量上具有交互作用。无土栽培芹菜N、P、K最优组合方案为N:89.60~112.55mg·kg-1;P:20.80~24.96mg·kg-1;K:171.60~218.40mg·kg-1。 展开更多
关键词 芹菜 硝酸盐 产量 相关性
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Ability of Ectomycorrhizal FUngus Laccaria biclor S238N to Increase the Growth of Douglas FIr Seedlings and Their Phosphorus and Potassium Uptake 被引量:19
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作者 HUANGJIANGUO F.LAPEYRIE 《Pedosphere》 SCIE CAS CSCD 1996年第3期217-224,共8页
Ectomycorrhizal fungus Laccaria bicolor S238N,isolated from a forest soil in central France in 1990s,has demonstrated unequivocally and ability to promote pine growth.In the present nursery bed experiment,the ability ... Ectomycorrhizal fungus Laccaria bicolor S238N,isolated from a forest soil in central France in 1990s,has demonstrated unequivocally and ability to promote pine growth.In the present nursery bed experiment,the ability of this ectomycorrhizal fungus to increase growth and P and K uptake of Douglas Fir seedlings (Zone 22) was examined.Growth of inoculated seedlings was over twice(plant height) and three times (biomass)that of non-inoculated ones.Similarly,both the concentrations and the amounts of P and K uptake by seedlings were significantly increased by fungal inoculation,indicating the improvement of P and K nutrition in mycorrhizal seedlings.In contrast,Al-P in the soils was decreased obviously by plants,especially by mycorrhizas,suggesting utilization of this soil P pool by plants and more efficient Al-P mobilization by mycorrhizas than by nomycorrhizas.Moreover,K extracted by 1mol/L HCl following consecutive extraction of H2O and CH3COONH4,which may not be plant available,could be utilized by fungus colonied roots.This could be explained by the release of protons and oxalate by hypae which leads to replacement of interlayer K in nonexpanded 2:1 clay minerals and bio-weathering of phyllosilicates. 展开更多
关键词 外生菌根真菌 黄杉树苗 p吸收 k吸收 促生长作用 S238n
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The Growth Characteristics of Three Terrestrial Plants Cultivated with Biogas Slurry as a Hydroponic Medium
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作者 Qun Kang Jinhui Zhao +3 位作者 Pan Zhu Qin Gong Ling Wang Zhaohua Li 《American Journal of Plant Sciences》 2020年第6期819-831,共13页
Biogas slurry is a traditional high-quality organic liquid fertilizer. Three terrestrial plants with high economic value, fu </span><span style="font-family:Verdana;">gui</span> <span st... Biogas slurry is a traditional high-quality organic liquid fertilizer. Three terrestrial plants with high economic value, fu </span><span style="font-family:Verdana;">gui</span> <span style="font-family:Verdana;">cai</span><span style="font-family:Verdana;">, yang </span><span style="font-family:Verdana;">xin</span> <span style="font-family:Verdana;">cai</span> <span style="font-family:Verdana;">and</span><span style="font-family:Verdana;"> strawberry, were selected for hydroponic cultivation using an optimal dilution of biogas slurry. The results of the experiments showed that strawberries could bloom and bear fruit and fu </span><span style="font-family:Verdana;">gui</span> <span style="font-family:Verdana;">cai</span><span style="font-family:Verdana;"> and yang </span><span style="font-family:Verdana;">xin</span> <span style="font-family:Verdana;">cai</span><span style="font-family:Verdana;"> grew well. However, in comparison with the control groups planted in soil, all three crops were subject to a certain degree of environmental stress, as shown by changes in growth, biomass indicators, physiological indicators </span><span style="font-family:Verdana;">and</span><span style="font-family:Verdana;"> morphological indicators. The leaves and stems of yang </span><span style="font-family:Verdana;">cai</span><span style="font-family:Verdana;"> and fu </span><span style="font-family:Verdana;">gui</span> <span style="font-family:Verdana;">cai</span><span style="font-family:Verdana;"> were tested for several types of heavy metals, and all met the requirements for human consumption. It is feasible to cultivate these three plants with biogas slurry. The results of this study can help guide hydroponic production practices and have practical significance and reference value. 展开更多
关键词 Biogas Slurry Fu Gui Cai Yang Xin Cai STRAWBERRY n/p/k Vitamin C CHLOROpHYLL Heavy Metals
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NaCl处理对海滨锦葵N、P和Na^+、K^+含量及其化学计量特征的影响 被引量:10
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作者 闫道良 郭予琦 《核农学报》 CAS CSCD 北大核心 2015年第6期1211-1217,共7页
为更好的开发利用耐盐经济植物海滨锦葵(Kosteletzkya pentacarpos),以了解盐处理下其N、P及Na+、K+吸收,本研究以海滨锦葵幼苗为材料,研究了不同盐浓度(0、2、4、8、12、16 g·L-1Na Cl)处理对海滨锦葵N、P和Na+、K+离子含量及其... 为更好的开发利用耐盐经济植物海滨锦葵(Kosteletzkya pentacarpos),以了解盐处理下其N、P及Na+、K+吸收,本研究以海滨锦葵幼苗为材料,研究了不同盐浓度(0、2、4、8、12、16 g·L-1Na Cl)处理对海滨锦葵N、P和Na+、K+离子含量及其化学计量特征的影响,处理50 d后采样分析。结果表明:海滨锦葵在高盐环境(16 g·L-1Na Cl)下,增强了对N的吸收,其中茎中N增加尤为明显。同时,茎、叶和全株的含P量也明显增加。相关分析表明,叶片P含量与盐梯度显著正相关(P<0.05)。茎、叶和全株的Na+含量随着盐梯度的增加而增加,尤其叶中Na+含量增加最为明显。叶中Na+含量与盐梯度呈极显著正相关(P<0.01)。茎、叶中K+含量随着盐梯度的增加表现明显下降趋势,其中叶中K+含量下降较为平缓,盐梯度与叶中K+含量表现显著负相关。盐梯度与植株N/P呈一定正相关,Na Cl盐梯度处理并没有对K+/Na+产生明显影响,植株保持相对较为稳定的K+、Na+离子平衡状态(即相对稳定的K+/Na+)。海滨锦葵叶中N与P显著正相关(P<0.05),与叶N/P极显著正相关(P<0.01),而与叶K+/Na+极显著负相关(P<0.01),说明对栽培海滨锦葵的滨海滩涂盐碱地施加氮肥,可以很好地促进植株对P的吸收。盐碱地一定量的Na Cl对海滨锦葵的生长无害,并有益于增强对P的吸收与积累。本研究结果对指导实践栽培具有重要的现实意义。 展开更多
关键词 na Cl处理 np na^%pLUS%、k^%pLUS% 化学计量比 海滨锦葵
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Effects of N,P and K Amounts on Yield Traits of Wheat in Wheat-cotton Intercropping System
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作者 王树林 祁虹 +4 位作者 王燕 张谦 冯国艺 林永增 梁青龙 《Agricultural Science & Technology》 CAS 2016年第7期1645-1647,1670,共4页
[Objective] This study was conducted to investigate the demands for N, P and K by wheat in wheat cotton intercropping system in high-fertility field of Hebei Province. [Method] The experiment adopted randomized block ... [Objective] This study was conducted to investigate the demands for N, P and K by wheat in wheat cotton intercropping system in high-fertility field of Hebei Province. [Method] The experiment adopted randomized block arrangement. Five treatments (0, 75, 150, 225 and 300 kg/hm2) were designed for N, P and K. Wheat tillering, ear number, yield and yield components were investigated. [Result] Wheat yield increased significantly with the application of N fertilizer. The number of ears per unit area, number of grains per ear, 1 000-grain weight and yield were im- proved with N increasing. P fertilizer improved wheat yield at a certain degree, but K had no effect on wheat yield. ]Conclusion] The optimum fertilization for wheat-cot- ton intercropping system was N at 225-300 kg/hm2 and P2Os at 150 kg/hm2; and there is no need to apply K. 展开更多
关键词 Wheat-cotton Intercropping System n p and k WHEAT YIELD
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关于K_2O_F的p^n-rank公式
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作者 朱翠香 《青岛大学学报(自然科学版)》 CAS 2005年第4期33-35,共3页
使用Browkin的方法,将Browkin关于MilnorK-群K2OF的2-rank公式推广到pn-rank的情况(p为素数,n≥1为自然数),从而得到了代数数域F的pn-rank公式,其中F包含pn-次本原单位根。
关键词 Milnork-群 本原单位根 k2OF的p^n-rank :Milnork一群 本原单位根 k20F的p“一rank
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The Effects of Legume Crops (Pea and Faba Bean) on Soil Nutrients Availability and Yield Parameters of Subsequent Cabbage Crops under Organic Production Conditions
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作者 Glenda Sallaku Josif Liko +1 位作者 Zamira Rada Astrit Balliu 《Journal of Environmental Science and Engineering(A)》 2016年第12期619-625,共7页
Three equal field plots were cultivated with respectively wheat, field pea and faba bean. The common conventional production technology, including the use of chemical fertilizers was applied in wheat, but no fertilize... Three equal field plots were cultivated with respectively wheat, field pea and faba bean. The common conventional production technology, including the use of chemical fertilizers was applied in wheat, but no fertilizers at all were used in faba bean and field pea plots. Atter legume harvesting, forty day old broccoli and cauliflower seedlings were transplanted to each of them according to three replications randomized block design. The transplanting was conducted at equal planting density, and common organic production practices were applied in entire production cycle. The legume crops improved soil fertility by increasing total soil N (Nitrogen) and improving P (Phosphorus) and K (Potassium) availability to the subsequent crops. As a result, an enhanced vegetative growth, improved curd setting and increased average curd weight was found in broccoli and cauliflower. However, there were significant differences between legume crops themselves regarding the proved benefits to the subsequent crops, confirming a clear advantage of faba bean versus field pea. A significantly higher above ground biomass was recorded in cauliflower plants followed faba bean, compared with field pea and wheat, but no difference was found regarding the biomass production in broccoli. The higher percentage of plants set curds (either broccoli or cauliflower) was obtained in the variants followed faba bean and then field pea. The same was true regarding total curd yield and the average curd weight for both: broccoli and cauliflower. 展开更多
关键词 Total n nitrogen extractable p phosphorus) extractable k potassium) average curd weight curd yield.
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