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应用土壤无机氮测试进行棉花氮肥推荐研究
Authors
刘宏平
田长彦
陈志超
马英杰
Publication date
1 January 2006
Publisher
Abstract
在南疆滴灌条件下进行氮肥大田试验,对应用土壤无机氮测试进行棉花氮素营养诊断及氮肥推荐进行了研究。结果表明,滴灌随水追肥技术有明显的增产节肥作用。在取得皮棉2728.8 kg.hm-2时,需施氮229.5 kg.hm-2。考虑土壤供氮能力,通过测定各生育期不同层次土壤供氮量,发现其与产量有很好的相关性,确定了相应的供氮量临界值。0~40 cm土壤供氮量对棉花产量有很大的贡献,40 cm以上层次的土壤无机氮可以表征土壤供氮能力。以0~20 cm土壤无机氮为氮素诊断指标,由土壤无机氮推荐施肥表,估算出了棉花各生育期应采用的氮肥追施用量
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Institutional Repository of Xinjiang Institute of Ecology and Geography, CAS
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Last time updated on 29/11/2016