江汉平原稻区16个水稻品种对氮肥的响应及其利用率差异

Response of 16 Rice Varieties to Nitrogen Fertilizer and Nitrogen Use Efficiency in the Jianghan Plan Area

  • 摘要: 研究不同水稻品种产量和氮肥利用率对氮肥响应的差异,可以为实施差异化施肥提供依据。以江汉平原稻区16个主推水稻品种为研究对象,通过田间小区试验,研究了施氮肥对水稻产量及其构成因素、氮素吸收和氮肥利用率的影响,比较了不同水稻品种对氮肥响应的差异。与不施氮肥(PK)相比,施氮处理(NPK)显著提高了水稻的产量和氮素吸收量,16个水稻品种增产量为882 ~ 3861 kg hm−2,增产率为9.7% ~ 64.8%;氮肥贡献率8.92% ~ 39.1%,农学效率4.5 ~ 19.8 kg kg−1,偏生产力35.3 ~ 56.6 kg kg−1,吸收利用率23.2% ~ 59.9%,生理利用率11.8 ~ 52.3 kg kg−1;16个水稻品种可大致分为3种类型,其中黄华占、荃优822、荃优丝苗和徽两优898等4个品种为氮肥高效敏感型,主要表现为氮肥贡献率、农学效率和吸收利用率较高;深两优3206、深两优828和泰优梦稻(两优S6)等3个品种为氮肥低效迟钝型,表现为氮肥贡献率、农学效率、吸收利用率和生理利用率均较低;其他9个品种为中间型,对氮肥的响应介于高效敏感型和低效迟钝型之间。实际生产中,高效敏感型品种可维持本研究氮肥用量,通过优化氮肥运筹方式,进一步发挥氮肥的增产作用;低效迟钝型品种需适当降低氮肥用量,以获得较高的氮肥利用率,减轻过量施氮的负面影响;中间型品种的产量潜力较高,建议通过田间试验研究确定最佳氮肥用量,以同时实现水稻高产和氮肥的高效利用。

     

    Abstract: In this paper, the yield of 16 rice varieties and their nitrogen (N) use efficiency were studied so as to provide a basis for reasonable application of N fertilizer. The effects of N fertilizer application on rice yield and its components of 16 rice varieties, N uptake and N use efficiency were analyzed based on a field experiment in the Jianghan plain, Hubei Province. N fertilizer treatment (NPK) significantly increased the grain rice yield by 9.7% ~ 64.8% compared with no N fertilizer treatment (PK). N contribution percentage (NCR) was 8.9% ~ 39.1%, N agronomic efficiency (NAE) was 4.5 ~ 19.8 kg kg−1, partial factor productivity of applied N fertilizer (PEPN) was 35.3 ~ 56.6 kg kg−1, N recovery efficiency (NRE) was 23.2% ~ 59.9%, and N physiological efficiency (NPE) was 11.8 ~ 52.3 kg kg−1. The 16 rice varieties were roughly divided into three types. Huanghuazhan, Quanyou 822, Quanyousimiao and huiliangyou 898 were the efficient and sensitive to N fertilizer type, with the main characteristics of high NCR, NAE and NRE. Shenliangyou 3206, Shenliangyou 828 and Taiyoumengdao (Liangyou S6) were the low efficient and insensitive to N fertilizer type, with the characteristics of low NCR, NAE, NRE and NPE. The other 9 varieties were the intermediate type, and their response to N fertilizer was between the above 2 types. For the high efficiency and sensitive rice type, the application amount of N fertilizer in this study be suggested, and the applied amount of N fertilizer should be optimized to increase rice yield. For the low efficiency and insensitive rice type, N fertilization rate should be appropriately reduced in order to obtain high N use efficiency and minimize the negative impact of excessive N fertilizer application. The intermediate rice type had a high yield potential, and its optimal N fertilizer amount should be recommended by field experiments, so as to achieve both high yield of rice and high N use efficiency at the same time.

     

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