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在黔东南地区进行水稻增产氮肥施用技术的田间试验,对不同总氮占比穗肥对水稻产量的影响进行了研究。结果表明,水稻孕穗期施用氮肥能使植株生长旺盛,有效穗和成穗率增加,总粒数增多,产量增加19.9~47.9kg/667m2,增幅达3.5%~8.4%。施氮占比为15%和20%时,增产效果较好,与不施氮对照相比,差异达显著水平。但与对照相比,各处理病虫害发生略有加重,结实率略为减少,生育期稍有延长,并随着穗肥施氮占比的增加而有所加重。应根据不同气候、土壤以及产量水平,确定最佳氮肥施用总量,在孕穗期选择适宜的总氮施用比例,适当提早施用氮肥。
In the southeastern Guizhou province, a field experiment was conducted on the technology of applying nitrogen fertilizer to increase the yield of rice. The effects of different total nitrogen on the yield of rice were studied. The results showed that nitrogen application at the booting stage of rice increased vigorously, the effective panicle and panicle percentage increased, the total grain number increased, and the yield increased by 19.9-47.9 kg / 667m2, an increase of 3.5% -8.4%. When the proportion of N application was 15% and 20%, the yield increase was better and the difference was significant compared with the control without nitrogen application. However, compared with the control, pests and diseases were slightly aggravated, the seed setting rate slightly decreased, the growth period slightly prolonged, and aggravated with the increase of the proportion of nitrogen fertilizer applied to the ear. According to different climate, soil and yield levels, determine the optimum amount of nitrogen fertilizer application, select the appropriate proportion of total nitrogen in the booting stage, the appropriate early application of nitrogen fertilizer.