, 2013 土壤水分和氮素是影响小麦高产的主要因素。小麦生产中水、肥之间存在着明显的交互作用，水、氮合理配合才能有效提高小麦的产量。本试验选用旱地小麦品种长武134和长旱58，在盆栽试验条件下设置了四个氮肥处理： (1)不施氮肥(N0)；(2)施氮量为0.12gN/kg (N1)；(3)施氮量为0.24gN/kg(N2)；(4)施氮量为0.36gN/kg (N3)。于花后采用称重控水方式设置了三个水处理：(1)整个生育期正常供水(W1)，土壤含水量保持为田间持水量的75%-85%；(2)中度水分胁迫处理(W2 ...
徐莹
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[Determination of eight per- and polyfluoroalkyl substances in seawater using dispersive membrane extraction-ultra-high performance liquid chromatography-tandem mass spectrometry]. [PDF]
Se PuRen Z +5 more
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, 2003 在陕西长武旱塬进行的试验表明,小麦施用氮肥增产显著。在小麦生育前期持续干旱条件下,地膜覆盖并没有使小麦表现出较好的增产效果。施用氮肥或氮肥与有机肥配施都可能引起NO-3向深层淋溶,而且氮肥用量越大,淋溶量及深度愈大;施用有机肥NO-3累积现象减弱。小麦对硝态氮主要吸收深度范围为0～80cm;不同施肥处理对土壤剖面NH+4的影响不大。施用氮肥会明显增加小麦吸氮量,但氮肥利用率随其用量增加而降低。试验条件下,低(施氮量为100kg/hm2)、高(施氮量为150kg/hm2 ...
党廷辉 +3 more
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[Determination of 51 per- and polyfluoroalkyl substances in raw water and drinking water by online solid-phase extraction coupled with ultra performance liquid chromatography- tandem mass spectrometry]. [PDF]
Se PuChen YY +5 more
europepmc +1 more source
, 2008 结合6个施氮水平下土壤Nmin速测值分析了土壤Nmin与施肥量和棉花产量关系,对应用土壤Nmin进行棉花氮肥推荐进行了研究。分析结果表明:土壤Nmin与棉花产量和施氮量均呈正相关关系,与土壤深度呈负相关关系;其中0~20cm土层土壤与施氮量和棉花产量相关性最强,可以很好的表征土壤初始供氮能力,因而可以利用它作为棉花氮肥推荐的指标。在考虑土壤初始供氮能力下,供试棉花品种达到最高产量时的最佳施肥量为226kghm-2,此时0~20cm土层土壤Nmin临界值为为20mgkg-1,并结合最佳施肥量和0 ...
周洪华, 李卫红, 陈亚宁
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[Determination of ethylene oxide and acetaldehyde in petrochemical exhaust based on thermal desorption- gas chromatography-mass spectrometry]. [PDF]
Se PuLi YJ.
europepmc +1 more source
[Research progress on ionic liquid-functionalized magnetic Fe<sub>3</sub>O<sub>4</sub> nanomaterials in sample pretreatment- chromatographic analysis]. [PDF]
Se PuLi JX +6 more
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[Determination of 26 perfluorinated and polyfluoroalkyl compounds in human serum by solid-phase extraction-high performance liquid chromatography-tandem mass spectrometry]. [PDF]
Se PuYue YX +9 more
europepmc +1 more source
[Research progress in material preparation and application of magnetism-enhanced in-tube solid-phase microextraction]. [PDF]
Se PuLuo YN +7 more
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