Results 1 to 10 of about 1,841 (145)
Effects of Configuration Ratios for Contour Planting and Replanted Sugarcane on Gully Erosion-Induced Nitrogen and Phosphorus Losses on Slopes [PDF]
, 2023 [Objective] The suitable configuration ratios for contour planting and replanted sugarcane on slopes were determined in order to provide technical support for reducing slope ditch erosion and nutrient loss, improving cultivated land quality and rational ...
Chen Tingting +8 more
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Effects of Cross-slope Tillage and Increasing Organic Fertilizer on Soil Nitrogen and Phosphorus Loss Characteristics and Soil Fertility on Gentle Slope [PDF]
, 2023 [Objective] Nitrogen and phosphorus loss characteristics and soil fertility changes on a gentle slope of cultivated land were analyzed under optimal fertilization and cross-slope tillage in order to provide a basis for reducing nitrogen and phosphorus ...
Chen Jianjun +4 more
core +1 more source
Comparison of fertilizer-effect models on winter wheat response to nitrogen and phosphorus fertilizers in saline soils in the Yellow River Delta [PDF]
, 2017 通过大田试验, 研究了黄河三角洲盐碱土地区冬小麦合适的肥料效应模型。在冬小麦生长季设置4种不同的氮磷肥用量, 根据“3414”试验设计8 种不同的肥效试验处理, 以探讨线性加平台、一元二次、平方根和二元二次4 种不同模型的拟合效果。结果显示, 4 种肥料效应模型的拟合结果经检验都达到极显著水平 (P<0.01)。在一元肥料效应模型中, 氮磷一元二次模型拟合效果最好, 最高收益分别为7 448.3 元·hm-2 和7 357.7 元·hm-2 ...
付希强 +8 more
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Shuitu Baochi Xuebao, 2006 在节水栽培条件下，研究了不同施氮量及氮肥运筹对冬小麦产量、氮肥利用率及生育期间土壤硝态氮的时空变化特征。同时计算了成熟期土壤硝态氮残留量。结果表明。节水栽培条件下冬小麦产量对氮肥反应不明显。氮肥利用率则随施氮量增加而显著降低。同时氮肥用量的增加显著增加了成熟期土壤硝态氮残留量。不同生育期0～60cm土层硝态氮含量均随施氮量增加而增加，开花期表现为施氮量157．5kg／hm^2或226．5kg／hm^2时氮肥一次性底施处理硝态氮含量均低于分次施用处理，成熟期表现为施氮量157．5kg／hm ...
张霞 +6 more
doaj +2 more sources
Shuitu Baochi Xuebao, 2004 通过田间氮磷肥配施试验研究了氮磷配施对黑土玉米农田生态系统玉米不同生育时期微生物量碳、氮的影响。微生物量随玉米不同生育期的动态变化表明,氮磷肥对微生物量碳和微生物量氮的动态影响并不同步,微生物量碳和微生物量氮变化最显著的时期均是授粉期,但此时微生物量碳是最低的谷值,而微生物量氮是最高的峰值。不同氮磷配比对微生物量碳影响的回归分析表明,氮肥是影响微生物量碳的主导因素,无论是适量施用还是过量施用都是氮肥对微生物量碳的影响较大。不同氮磷配比对微生物量氮影响的回归分析表明 ...
王继红 刘景双 于君宝 王金达
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Shuitu Baochi Xuebao, 2022 为探明减氮配施缓释氮肥对棉田土壤酶活性和氮素吸收利用的影响,通过试验研究减氮、配施不同比例缓释氮肥对棉花土壤理化性质、酶活性、无机氮含量、氮肥利用率及棉花产量的影响。试验选用"新陆早64号"棉花品种,设置2种施氮方式,分别为常规全施尿素(T2)和缓释氮肥与尿素不同比例配施(US),配施处理按照施氮量设3个水平,分别为不减氮U0.8S0.2(T3)、U0.6S0.4(T4),减氮20% U0.6S0.2(T5)、U0.4S0.4(T6),减氮40% U0.4S0.2(T7)、U0.2S0.4(T8 ...
邱悦 +5 more
doaj +2 more sources
Effects of Water and Nitrogen Management on Soil Nitrogen Metabolism Enzyme Activity and Wheat Nitrogen Utilization [PDF]
[Objective] To explore the effects of water and nitrogen management on soil nitrogen metabolism enzyme activity and wheat nitrogen utilization under irrigation based on soil moisture.
CUI Zhenkun +4 more
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Functional Ecology, Volume 40, Issue 5, Page 1428-1442, May 2026.Read the free Plain Language Summary for this article on the Journal blog. Abstract The stoichiometric imbalance caused by nitrogen (N) deposition typically exacerbates phosphorus (P) limitation in plants. However, it remains unclear whether this effect extends to soil microbes, particularly those in the rhizosphere.
Jipeng Wang +5 more
wiley +1 more source
Shuitu Baochi Xuebao, 2021 探明单季晚稻缓释氮肥一次性施用模式中缓释氮占总施氮量的适宜比例，为单季晚稻高效施肥提供理论指导。2019—2020年在浙江省长兴县和平镇开展田间试验。试验共设6个处理：（1）不施氮肥（N0）；（2）常规施肥（U1，基肥：分蘖肥：穗肥为4：3：3）；（3）常规施肥减氮12.5%（U2，比例同U1）；（4）57%缓释氮一次性施用（SRU1）；（5）45%缓释氮一次性施用（SRU2）；（6）34%缓释氮一次性施用（SRU3）。U1的施氮量为240 kg/hm2，U2和SRU的施氮量均为210 kg/hm2 ...
张金萍 +8 more
doaj
Gradient distributions of nitrogen and organic carbon in the soils from inland to tidal flat in the Yellow River Delta [PDF]
, 2014 黄河三角洲是我国典型的通过黄河冲积泥沙填海造陆形成的近代沉积区。区域受到黄河冲积、沉积等自然过程和农业耕种熟化等人类活动的双重影响。本研究通过在黄河三角洲地区内陆到河口海湾不同距离采集典型土壤类型剖面发生层样品，探讨土壤有机碳、总氮等生源要素的空间分布规律，为阐明我国典型海岸带地区陆源碳、氮的输送及循环特征提供基础依据。研究结果表明，黄河三角洲内陆与河口地区呈现出完全不同的土壤碳、氮分布规律。表层土壤碳、氮含量在黄河沿岸及三角洲南部均表现出由陆向海逐级递减的空间分布特征 ...
李远 +4 more
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