氮肥管理对有序机抛早稻产量及氮素利用的影响
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国家水稻产业体系岗位专家项目(CARS–01–27)


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    摘要:

    以常规早稻品种湘早籼24号为材料,于2021—2022年开展大田试验,设3个氮肥水平,即120 kg/hm2 (N1)、150 kg/hm2 (N2)和180 kg/hm2 (N3),4个氮肥分配处理T1、T2、T3、T4,基肥、分蘖肥、穗肥的施用比例分别为1∶1∶1、 0∶1∶1、1∶0∶1、1∶1∶0,以生产推荐施肥CK(施氮量120 kg/hm2,基肥、分蘖肥、穗肥的施用比例为5∶3∶2)和零氮处理(N0)为对照,研究施氮量和氮肥分配对有序机抛早稻产量、生长特性及氮素利用的影响。结果表明:N3、N2、N1的早稻平均产量依次降低,N1的平均产量显著低于CK而高于N0的;在不同氮肥分配下,T2的产量低于T1、T3、T4和CK的,其中显著低于T4的;分析产量构成因子发现,产量的降低主要缘于单位面积穗数的下降;基肥不施氮肥的T2处理的分蘖率虽未显著降低,但其成穗率低,导致单位面积有效穗数下降;随着施氮量的增加,早稻氮素利用率随之下降;在不同氮肥分配下,T2的氮肥吸收利用率、氮肥农学利用率均显著低于T4的。可见,基肥缺失氮肥对有序机抛早稻的产量和氮素利用率影响较大,而穗肥不施氮肥对有序机抛早稻的产量和氮素利用率影响较小,推测前期氮肥管理可能是水稻有序机抛栽培高产的关键因子。

    Abstract:

    This study investigated the effects of nitrogen fertilizer application rate and distribution on the yield, growth characteristics and nitrogen utilization of ordered machine throwing early rice. Field experiments on conventional early rice variety Xiangzaoxian 24 were conducted from 2021 to 2022 by setting three levels of nitrogen applications, namely N1(120 kg/hm2), N2(150 kg/hm2) and N3(180 kg/hm2), five groups of nitrogen fertilizer allocation ratios of basal fertilizer, tillering fertilizer and panicle fertilizer, T1(1∶1∶1), T2(0∶1∶1), T3(1∶0∶1), T4(1∶1∶0), and the control CK(nitrogen application rate of 120 kg/hm2, the application ratio 5∶3∶2) and zero nitrogen treatment(N0). The results showed that the average yield of early rice with orderer machine throwing decreased sequentially with the decrease of nitrogen application rate, and the average yield of N1 was significantly lower than that of CK and higher than that of N0. The yield of T2 was lower than those of T1, T3, T4 and CK, with a significant decrease compared to T4. Analysis of yield components reveals that the decrease in yield mainly resulted from the decrease in the number of spikes per unit area. The tillering rate of T2 treatment did not significantly decrease, but had low panicle formation rate and decreased panicles per unit area. The nitrogen utilization efficiency of ordered machine throwing early rice decreases when the nitrogen application rate increases. The nitrogen absorption and utilization efficiency, as well as the agronomic utilization efficiency of T2 were significantly lower than those of T4. It could be seen that instead of panicle fertilizer, basal fertilizer with nitrogen fertilizer had a significant impact on the yield and nitrogen utilization efficiency of ordered machine throwing early rice. It could be concluded that nitrogen fertilizer management in the early stage might be a key factor for high yield in ordered machine throwing cultivation of rice.

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覃斌,孙鑫,刘福强,何在周,向军,陶祖豪,王慰亲,郑华斌,唐启源.氮肥管理对有序机抛早稻产量及氮素利用的影响[J].湖南农业大学学报:自然科学版,2024,50(1):.

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  • 在线发布日期: 2024-03-22
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