作物学报 ›› 2020, Vol. 46 ›› Issue (6): 924-936.doi: 10.3724/SP.J.1006.2020.91060
LUO Wen-He,SHI Zu-Jiao,WANG Xu-Min,LI Jun(),WANG Rui
摘要:
针对当前关中平原冬小麦生产中氮肥投入过量、灌溉水资源不足的问题, 研究节水减氮栽培模式下冬小麦籽粒产量、水氮利用及硝态氮淋失情况, 能为确定冬小麦节水减肥环保增效的生产模式提供理论依据。于2017—2019年在陕西杨凌开展冬小麦节水减氮田间栽培试验, 采用二因素裂区设计, 施氮量为主处理, 灌水量为副处理, 设施氮量处理N300 (300 kg hm -2)、N225 (225 kg hm -2)、N150 (150 kg hm -2)、N75 (75 kg hm -2)、N0 (不施氮)和灌水量处理W2 (1200 m 3 hm -2)、W1 (600 m 3 hm -2)、W0 (0), 分析小麦产量、水氮利用效率及土壤硝态氮淋失情况。结果表明, 2017—2018年和2018—2019年小麦季灌水处理较不灌水处理分别增产14.88%~15.01%和4.11~4.16倍, 但处理间差异不显著, 而越冬期灌水600 m 3 hm -2土壤硝态氮淋失风险显著降低。在越冬期灌水600 m 3 hm -2处理下, 2017—2018年施氮量150 kg hm -2处理产量最高, 2018—2019年则是施氮量225 kg hm -2处理产量最高, 但2018—2019年施氮量150 kg hm -2处理在较高产量基础上获得较高的氮肥利用效率, 土壤硝态氮淋失量也较施氮量225 kg hm -2处理2个年度分别降低了15.87%和10.20%。因此, 施氮量150 kg hm -2配合越冬期灌水600 m 3 hm -2, 能够在保障产量的基础上, 提高水氮利用效率, 降低硝态氮淋失风险, 实现关中平原冬小麦生产节水减肥环保增效的目标。
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