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为了探讨控释氮肥施用的最佳用量,试验设5个处理,研究水稻控释氮肥对寒地水稻植株和土壤氮素含量及产量的影响。结果表明:整个生育期控释氮肥处理提高了土壤铵态氮和硝态氮含量,且铵态氮先升高后下降,抽穗期含量最高,硝态氮先下降后升高,抽穗-乳熟期含量最低。不同氮肥处理植株全氮逐渐升高,成熟期达到最大值,T3处理最高。控释氮肥处理产量高于常规施肥处理,T4处理产量最高,达到7944.44 kg/hm2,与T2处理相比提高7.3%,与T1处理相比提高19.0%,差异都达到显著水平。因此,控释氮肥合理施用提高了土壤铵态氮和硝态氮及植株全氮的含量,促进了水稻植株干物质的积累,从而提高作物产量。
In order to investigate the optimum dosage of controlled release nitrogen fertilizer, five treatments were set up to study the effect of controlled release nitrogen fertilizer on nitrogen content and yield of rice plants in cold region and soil. The results showed that the controlled release nitrogen fertilizer increased the content of ammonium nitrogen and nitrate nitrogen in the soil during the whole growth period, and the content of ammonium nitrogen increased firstly and then decreased, the content of nitrogen increased at heading stage, nitrate nitrogen decreased first and then increased, Period of the lowest content. The nitrogen content of different nitrogenous fertilizer plants increased gradually, reaching the maximum value at maturity and reached the highest at T3 treatment. The yield of controlled-release nitrogen fertilizer was higher than that of conventional fertilization treatment. The yield of T4 treatment was the highest, reaching 7944.44 kg / hm2, increased by 7.3% compared with T2 treatment and increased by 19.0% compared with T1 treatment. The differences were all significant. Therefore, the rational application of controlled-release nitrogen fertilizer increased soil ammonium nitrogen and nitrate nitrogen and plant total nitrogen content, and promoted the accumulation of dry matter in rice plants, thereby increasing crop yield.