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武斌,曹永刚,胡发龙,殷文,樊志龙,范虹,柴强*
WU Bin,CAO Yong-Gang,HU Fa-Long,YIN Wen,FAN Zhi-Long,FAN Hong,CHAI Qiang*
摘要:
针对河西绿洲灌区小麦生产连作普遍、氮肥施用量大等问题,开展轮作结合免耕对减量施氮小麦产量的影响研究,以期为优化小麦栽培管理提供依据。2022—2023年,通过裂区试验,重点研究前茬玉米及其处理方式(免耕留茬、翻耕)对减量施氮小麦干物质累积特性、产量及其构成要素的影响,试验主区为免耕轮作小麦(NTRW)、翻耕轮作小麦(CTRW)、翻耕连作小麦(CTCW) 3种种植方式,裂区设小麦225 kg hm-2 (常规,N1)和180 kg hm-2 (减氮20%,N2) 2个施氮水平。结果表明,轮作较连作可提高小麦籽粒产量及生物产量,且轮作能有效补偿氮肥减施引起的产量下降负效应,与免耕结合能进一步强化补偿效应。与CTCW相比,NTRW、CTRW籽粒产量分别提高31.7%、17.3%,生物产量分别提高15.3%、10.3%;氮肥减施20%后籽粒产量及生物产量分别降低6.2%、3.7%。但CTRWN2较CTCWN1生物产量提高4.6%,籽粒产量差异不显著,且NTRWN2较CTCWN1籽粒产量和生物产量分别提高21.9%、11.6%。与CTCW相比,NTRW、CTRW孕穗期-成熟期的CGR分别提高22.4%、13.6%,全生育期Vmean分别提高15.0%、10.2%;氮肥减施20%后CGR及Vmean分别降低3.8%、3.6%。但CTRWN2较CTCWN1的CGR和Vmean分别提高6.3%、4.5%,且NTRWN2较CTCWN1的CGR和Vmean分别提高19.3%、11.6%。与CTCW相比,NTRW、CTRW穗粒数分别提高12.0%、4.7%,收获指数分别提高14.4%、6.5%,穗数分别提高5.0%、8.0%;氮肥减施20%后穗粒数、收获指数、穗数分别降低2.5%、2.9%、2.3%。但CTRWN2较CTCWN1的穗数提高4.3%,穗粒数、收获指数差异不显著,且NTRWN2较CTCWN1穗粒数、收获指数分别提高10.3%、9.3%,穗数差异不显著。因此,在河西绿洲灌区,免耕轮作小麦结合180 kg hm-2施氮量是该区适宜推广利用的小麦节氮增产有效措施。
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