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为探究氮肥和幼穗分化后期高温对水稻产量的综合影响,以杂交稻淦鑫203为材料,设置2个氮肥水平,于水稻幼穗分化后期38℃高温处理4 d,研究氮肥和穗分化后期高温对早稻产量、SPAD值及可溶性糖含量的影响。结果表明,高氮或是常氮下,与适温相比,高温降低了淦鑫203的结实率、单茎产量、SPAD值和可溶性糖含量。高温或适温下,与常氮相比,高氮增加了结实率、单茎产量和可溶性糖含量。高温高氮的结实率、单茎产量和单株产量高于高温常氮,说明适当增施氮肥可缓解高温的减产作用。
In order to explore the combined effects of nitrogen fertilizer and late panicle hyperthermia on rice yield, two nitrogenous fertilizers were set up in Ganxin 203, and were treated at 38 ℃ for 4 d in late panicle differentiation stage. Effect of High Temperature on Yield, SPAD Value and Soluble Sugar Content of Early Rice. The results showed that under high nitrogen or normal nitrogen, high temperature reduced the seed setting rate, single stem yield, SPAD value and soluble sugar content of Ganxin 203 compared with the suitable temperature. Compared with nitrogen, high nitrogen increased seed setting rate, single stem yield and soluble sugar content at high or moderate temperature. Seed setting rate, single stem yield and single plant yield of high temperature and high nitrogen were higher than those of high temperature and normal nitrogen, indicating that proper nitrogen application can alleviate the high temperature yield reduction.