作物学报 ›› 2026, Vol. 52 ›› Issue (11): 3366-3375.doi: 10.3724/SP.J.1006.2026.63041
李嘉1,吕慎强2,王晋峰1,王筱斐2,杨泽宇2,王林权2,3,*
Li Jia1,Lyu Shen-Qiang2,Wang Jin-Feng1,Wang Xiao-Fei2,Yang Ze-Yu2,Wang Lin-Quan2,3,*
摘要:
明确施肥时间及氮肥种类对春玉米产量、肥料氮去向的影响,可为黄土塬区雨养春玉米合理氮素管理提供理论依据。本研究于2020—2022年采用田间大区和微区结合的方法,设4个大区处理:(1) 不施氮(CK);(2) 分次施普通尿素(S-U,基施40%,十叶期(V10)追施60%);(3) 一次性基施普通尿素(B-U);(4) 一次性基施基质缓释尿素(B-SRU)。微区内采用15N标记尿素(10.14 atom%)对施入氮肥进行示踪,其中分次施肥处理另设仅基肥为15N标记尿素(S-Ubm)和仅追肥为15N标记尿素(S-Utm)两个微区。所有施氮处理施氮量均为180 kg hm?2。结果显示,B-SRU产量较高,但与其余施氮处理未达显著差异,其经济效益较S-U显著增加2338 yuan hm?2。各施氮处理整季氮素累积量无显著差异,但植株氮素来源于肥料氮的量(Ndff)的阶段特征随施肥时间和肥料种类而异。与B-Um相比,S-Um显著降低53.7% V10前Ndff,增加63.2% V10后Ndff;B-SRUm降低12.4% V10前Ndff,增加22.4% V10后Ndff。S-Um植株氮素来源以追肥氮为主,但S-Ubm第1季15N利用率高于S-Utm。氮去向方面,S-Um第1季15N利用率、残留率和损失率分别为29.7%、49.6%和20.8%,B-Um第1季15N利用率与S-Um无显著差异,但残留率显著降低29.3%,损失率增加70.7%,15N累积利用率降低18.5%。B-SRUm较B-Um增加0~20 cm土层31.4% 15N土壤残留量,残留率显著提高39.5%,损失率降低26.7%,并增加后茬作物对残留氮素的吸收,15N累积利用率提高7.4%。综上,黄土塬区雨养春玉米区一次性基施基质缓释尿素不仅能维持产量,而且可有效增加经济效益,降低氮素损失率,是适宜当地春玉米轻简化种植的科学施肥措施。
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