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综合调理剂对集约化设施土壤氮素吸收及其形态转化的影响 被引量:1
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作者 郭刘明 卢树昌 +3 位作者 朱梦梦 李婧涵 刘树宇 赵鑫霞 《天津农业科学》 CAS 2022年第8期33-38,共6页
设施菜田氮养分投入偏高,造成土壤潜在面源污染风险增加。本研究采用不同种类土壤调理剂开展设施盆栽试验,研究糯玉米生长、氮素吸收及土壤氮素形态转化。试验结果表明:T8(白云石100%+明矾50%)处理在糯玉米生长中期株高、茎粗等长势指... 设施菜田氮养分投入偏高,造成土壤潜在面源污染风险增加。本研究采用不同种类土壤调理剂开展设施盆栽试验,研究糯玉米生长、氮素吸收及土壤氮素形态转化。试验结果表明:T8(白云石100%+明矾50%)处理在糯玉米生长中期株高、茎粗等长势指标较好,干物质质量最高,干物质含量为95.0 g·盆^(-1),高于CK处理16.7%,氮素吸收量也较高。在减少土壤全氮含量方面,施用组合调理剂处理大于单一调理剂的处理,其中T9(生物炭30%+腐植酸30%+明矾30%)组合处理效果较好,且土壤C/N显著增高,而T8处理对降低土壤中硝态氮含量作用显著,较CK处理相比,硝态氮含量减少了14.12%,可减少土壤中有效氮素的积累。另外,综合调理剂处理对土壤脲酶活性的抑制作用大于单一调理剂处理。综合来看,盆栽试验条件下,T8处理在糯玉米生长、干物质质量积累以及氮素吸收方面表现更好。 展开更多
关键词 综合调理剂 土壤氮素吸收 设施菜田 土壤氮素形态转化
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Effect of Enriched Cattle Manure on Soil Nutrient Status, Nitrogen Uptake and Yield of Tea (Camellia sinensis)
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作者 Vivian Moroamoche Kekana Isaiah Tabu +1 位作者 David Kamau Robert Obura 《Journal of Agricultural Science and Technology(A)》 2014年第2期123-128,共6页
Inorganic fertilizer NPK (nitrogen, phosphorus and potassium) (S) 25:5:5:5 is generally recommended for optimum yield and quality of tea (Camellia sinensis). Non-judicious use of this inorganic fertilizer how... Inorganic fertilizer NPK (nitrogen, phosphorus and potassium) (S) 25:5:5:5 is generally recommended for optimum yield and quality of tea (Camellia sinensis). Non-judicious use of this inorganic fertilizer however acidifies the soils and pollutes the environment. Integrated soil fertility management (ISFM) which involves the combined use of organic and inorganic fertilizer is recommended for improved crop yield and soil health. An experiment was carried out to determine the effect of enriching cattle manure with different ratios of inorganic fertilizers (OM: NPKS at ratios 1:2 and 1:4), and rates on soil nutrient status, nitrogen uptake and yield of tea in the east of Rift Valley, Kenya. Enriching manures and organic manure up to a rate of 150 kg N/ha increased the level of P mature leaf. A higher N and K level in the mature leaf was observed when NPKS was applied at higher rates. In the soil, fertilizer rate up to 150 kg N/ha showed higher pH and K where organic manure and enriched manures were applied while NPKS treatment showed higher P content throughout the soil depths. Enriching organic manures with inorganic fertilizers increased yield significantly. 展开更多
关键词 Cattle manure ENRICHMENT NITROGEN tea (Camellia sinensis) YIELD inorganic fertilizer ISFM
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The uptake diversity of soil nitrogen nutrients by main plant species in Kobresia humilis alpine meadow on the Qinghai-Tibet Plateau 被引量:17
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作者 WANG WenYing MA YongGui +3 位作者 XU Jin WANG HuiChun ZHU JinFu ZHOU HuaKun 《Science China Earth Sciences》 SCIE EI CAS 2012年第10期1688-1695,共8页
We studied the uptake of ammonium, nitrate, and a variety of amino acids by alpine plant species in the Kobresia humil alpine meadow ecosystem in situ. We examined the extent of niche separation in uptake of N source ... We studied the uptake of ammonium, nitrate, and a variety of amino acids by alpine plant species in the Kobresia humil alpine meadow ecosystem in situ. We examined the extent of niche separation in uptake of N source by different plant species in alpine communities, and investigated the contribution of symbiotically fixed N to the total N in alpine meadow. The results are (1) δ15N natural abundance values of 13 plant species lie between -2.680‰ and 5.169‰, and the scope is 7.849‰. (2) Le- guminous plants, such as Trigonella ruthenica, Gueldenstaedtia diversiffolia, and Oxytyopis ochrocephala, and non-legumi- nous plant Gentiana straminea uptake low amounts of 15N labeled ammonium, nitrate, glycine or aspartate in soil. (3) As far as the plant uptake of organic N is concerned, Kobresia humilis, Poa pratensis, and Gentiuna spathutifolta can effectively uptake organic nitrogen, and about 37%-40% of the nitrogen of these species comes from soil organic nitrogen sources (such as glycine and aspartate). Stipa aliena can effectively uptake nitrate, and 60% of its nitrogen comes from soil nitrate. Potentilla anserina, Poa pratensis, and Thalictrum alpinum can effectively absorb ammonium in comparason to other plant species in the meadow, and about 25%-27% of the nitrogen in these plants comes from soil ammonium. (4) The contribution of leguminous fixed N to total N is 7.48%-9.26% in Kobresia humilis alpine meadow. (5) These data show many plant species of alpine meadow may effectively utilize dissolved organic nitrogen such as amino acids, and these plants have diverse ways to uptake soil nitrogen in alpine meadows. Based on the results we can partly explain why there are abundant biodiversities and how plants at alpine habitat utilize the limited soil N sources. 展开更多
关键词 Kobresia humilis alpine meadow 15N tracer technique plant organic nutrition soil nitrogen
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