In order to explore the technology and effects of reducing nitrogen and potassium fertilizer applications in double-cropping rice,a field plot experiment was conducted to study the effects of optimized application of ...In order to explore the technology and effects of reducing nitrogen and potassium fertilizer applications in double-cropping rice,a field plot experiment was conducted to study the effects of optimized application of nitrogen and potassium fertilizers combined with returning Chinese milk vetch and straw to fields on yield,fertilizer utilization efficiency,net photosynthetic rate(Pn),stomatal conductance(Gs),intercellular CO_(2) concentration(Ci),chlorophyll content(SPAD value)and soil physical and chemical properties in late rice harvest period.The results showed that the optimized application of nitrogen and potassium fertilizers combined with the integrated technology of Chinese milk vetch and straw co-returning to the field could enhance the photosynthetic efficiency of double-cropping rice,increase rice yield,and enhance soil biological activity,especially T4 treatment involving the returning of Chinese milk vetch and straw to the field instead of 30%nitrogen fertilizer achieved the highest rice yield,fertilizer use efficiency,net photosynthetic rate and soil biological activity.Compared with the conventional fertilization treatment T2,the total rice yield of T4 treatment increased by 4.1%,among which the early rice and late rice increased by 6.3%and 2.4%,respectively;Pn,Gs and SPAD values of flag leaves at full heading stage significantly increased,and the contents of soil active organic carbon,alkali hydrolyzed nitrogen,available phosphorus and readily available potassium significantly increased.展开更多
[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
Different ratios of NPK were adopted in this research to study its effects on the objective traits of 2 early forage-rice varieties, and to obtain the optimum ratio to further improve the application technique in theo...Different ratios of NPK were adopted in this research to study its effects on the objective traits of 2 early forage-rice varieties, and to obtain the optimum ratio to further improve the application technique in theory. At the same time, the possibility of increasing yield and protein content in the grain through cultivation technique was also studied. The conclusions were：展开更多
基于重庆地区土壤肥力及施肥水平,在保证作物稳产、优质的情况下,探讨氮钾减量配施对甘薯产量、品质、养分利用和土壤肥力的影响,以期确定本地区甘薯是否存在减肥空间以及适宜的减量配施策略。2021—2022年连续2年在重庆市北碚区歇马街...基于重庆地区土壤肥力及施肥水平,在保证作物稳产、优质的情况下,探讨氮钾减量配施对甘薯产量、品质、养分利用和土壤肥力的影响,以期确定本地区甘薯是否存在减肥空间以及适宜的减量配施策略。2021—2022年连续2年在重庆市北碚区歇马街道西南大学薯类作物研究所开展田间试验,采用双因素随机区组试验设计,氮、钾各三水平,分别以常规施N量为126.00 kg hm^(-2)(A1),减施10%(A2)和20%(A3);常规施K2O量96.00 kg hm^(-2)(B1),减施5%(B2)和10%(B3)。试验结果表明,一定程度的氮钾减量配施不会造成甘薯产量的显著下降,氮肥减施达到20%(A3)甘薯单株结薯数显著降低,A3较A1显著减产9.25%。氮肥减施10%和20%分别较A1的块根可溶性糖含量显著增加了0.25%和0.36%,钾肥减施10%则较B1的可溶性糖含量显著增加了0.47%。但氮钾减量配施对甘薯块根淀粉率和可溶性蛋白含量存在不利影响。综上所述,相较于本地常规施氮钾量,减氮10%(A2)配合减钾5%(B2),即施氮量为119.70 kg hm^(-2)、施钾量为86.40 kg hm^(-2),不会降低渝薯198产量和土壤酶活性,可作为本区域甘薯生产中的推荐施肥量.展开更多
【目的】探究氮钾肥施用次数对棉花的影响,为进一步提高长江流域棉区夏直播棉花产量提供参考。【方法】于2021―2022年开展大田试验,采用裂区设计,主区为钾肥(210 kg·hm^(-2))施用次数:K1[播种前(PP)100%]和K2[PP 50%+见花(FF)0 d ...【目的】探究氮钾肥施用次数对棉花的影响,为进一步提高长江流域棉区夏直播棉花产量提供参考。【方法】于2021―2022年开展大田试验,采用裂区设计,主区为钾肥(210 kg·hm^(-2))施用次数:K1[播种前(PP)100%]和K2[PP 50%+见花(FF)0 d 50%];副区为氮肥(210 kg·hm^(-2))施用次数:N2[PP 20%+FF 0 d 80%]、N3[PP 20%+FF 0 d 60%+FF 21 d 20%]和N4[PP 10%+FF 0 d 50%+FF 7 d 30%+FF 21 d 10%]。分析不同处理对棉花干物质积累与分配、氮钾积累与分配、产量及其构成因素和养分利用率的影响。【结果】K2N3处理下棉株和源、流、库器官拔秆期的干物质质量和氮、钾积累量以及干物质快速积累期的持续时间和平均积累速率均低于K2N4处理,但干物质以及氮钾向库器官的分配比例较K2N4处理高。K2N3处理可获得较高的籽棉产量和皮棉产量,较K1N2处理(产量最低)分别显著提高31.4%和31.9%,进一步增加施氮次数(K2N4处理)没有显著提高棉花产量。K2N3和K2N4处理的氮肥和钾肥偏生产力无显著差异,但二者均显著高于其他处理。主成分分析结果显示棉花产量的差异主要来源于铃数,促进干物质和氮钾养分向库器官分配有利于提高棉花产量。【结论】长江流域棉区麦后直播棉花,2次施钾配合3次施氮能促进棉株对氮钾的吸收,促进干物质和氮钾养分向库器官分配,增加铃数,提高棉花产量。展开更多
文摘In order to explore the technology and effects of reducing nitrogen and potassium fertilizer applications in double-cropping rice,a field plot experiment was conducted to study the effects of optimized application of nitrogen and potassium fertilizers combined with returning Chinese milk vetch and straw to fields on yield,fertilizer utilization efficiency,net photosynthetic rate(Pn),stomatal conductance(Gs),intercellular CO_(2) concentration(Ci),chlorophyll content(SPAD value)and soil physical and chemical properties in late rice harvest period.The results showed that the optimized application of nitrogen and potassium fertilizers combined with the integrated technology of Chinese milk vetch and straw co-returning to the field could enhance the photosynthetic efficiency of double-cropping rice,increase rice yield,and enhance soil biological activity,especially T4 treatment involving the returning of Chinese milk vetch and straw to the field instead of 30%nitrogen fertilizer achieved the highest rice yield,fertilizer use efficiency,net photosynthetic rate and soil biological activity.Compared with the conventional fertilization treatment T2,the total rice yield of T4 treatment increased by 4.1%,among which the early rice and late rice increased by 6.3%and 2.4%,respectively;Pn,Gs and SPAD values of flag leaves at full heading stage significantly increased,and the contents of soil active organic carbon,alkali hydrolyzed nitrogen,available phosphorus and readily available potassium significantly increased.
基金Supported by National Science and Technology Support Program(2007BAD89B14)Science and Technology Project of Guangdong Province(2009B020201011)~~
文摘[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.
文摘Different ratios of NPK were adopted in this research to study its effects on the objective traits of 2 early forage-rice varieties, and to obtain the optimum ratio to further improve the application technique in theory. At the same time, the possibility of increasing yield and protein content in the grain through cultivation technique was also studied. The conclusions were：
文摘基于重庆地区土壤肥力及施肥水平,在保证作物稳产、优质的情况下,探讨氮钾减量配施对甘薯产量、品质、养分利用和土壤肥力的影响,以期确定本地区甘薯是否存在减肥空间以及适宜的减量配施策略。2021—2022年连续2年在重庆市北碚区歇马街道西南大学薯类作物研究所开展田间试验,采用双因素随机区组试验设计,氮、钾各三水平,分别以常规施N量为126.00 kg hm^(-2)(A1),减施10%(A2)和20%(A3);常规施K2O量96.00 kg hm^(-2)(B1),减施5%(B2)和10%(B3)。试验结果表明,一定程度的氮钾减量配施不会造成甘薯产量的显著下降,氮肥减施达到20%(A3)甘薯单株结薯数显著降低,A3较A1显著减产9.25%。氮肥减施10%和20%分别较A1的块根可溶性糖含量显著增加了0.25%和0.36%,钾肥减施10%则较B1的可溶性糖含量显著增加了0.47%。但氮钾减量配施对甘薯块根淀粉率和可溶性蛋白含量存在不利影响。综上所述,相较于本地常规施氮钾量,减氮10%(A2)配合减钾5%(B2),即施氮量为119.70 kg hm^(-2)、施钾量为86.40 kg hm^(-2),不会降低渝薯198产量和土壤酶活性,可作为本区域甘薯生产中的推荐施肥量.
文摘【目的】探究氮钾肥施用次数对棉花的影响,为进一步提高长江流域棉区夏直播棉花产量提供参考。【方法】于2021―2022年开展大田试验,采用裂区设计,主区为钾肥(210 kg·hm^(-2))施用次数:K1[播种前(PP)100%]和K2[PP 50%+见花(FF)0 d 50%];副区为氮肥(210 kg·hm^(-2))施用次数:N2[PP 20%+FF 0 d 80%]、N3[PP 20%+FF 0 d 60%+FF 21 d 20%]和N4[PP 10%+FF 0 d 50%+FF 7 d 30%+FF 21 d 10%]。分析不同处理对棉花干物质积累与分配、氮钾积累与分配、产量及其构成因素和养分利用率的影响。【结果】K2N3处理下棉株和源、流、库器官拔秆期的干物质质量和氮、钾积累量以及干物质快速积累期的持续时间和平均积累速率均低于K2N4处理,但干物质以及氮钾向库器官的分配比例较K2N4处理高。K2N3处理可获得较高的籽棉产量和皮棉产量,较K1N2处理(产量最低)分别显著提高31.4%和31.9%,进一步增加施氮次数(K2N4处理)没有显著提高棉花产量。K2N3和K2N4处理的氮肥和钾肥偏生产力无显著差异,但二者均显著高于其他处理。主成分分析结果显示棉花产量的差异主要来源于铃数,促进干物质和氮钾养分向库器官分配有利于提高棉花产量。【结论】长江流域棉区麦后直播棉花,2次施钾配合3次施氮能促进棉株对氮钾的吸收,促进干物质和氮钾养分向库器官分配,增加铃数,提高棉花产量。
