水氮管理模式对粳稻养分吸收的影响

Effect of Water-Nitrogen Management on Nutrient Absorption of Rice

以寒地粳稻为试验材料,在节水控灌与常规灌溉条件下,研究了不同氮肥水平对水稻养分吸收的影响。结果表明:节水控灌降低了水稻分蘖期的氮素积累量,提高了抽穗期和成熟期水稻氮素积累量。施氮能够显著提高植株氮素积累量,且氮素积累量随着施氮量的提高而增加。同一施氮水平下,磷素积累量表现为节水控灌高于常规灌溉,不同生育时期植株磷素积累量均随氮素水平的提高而增加,积累量最高值先后出现在氮肥125 kg·hm^(-2)和150 kg·hm^(-2)水平处理。与常规灌溉相比,节水控灌提高了成熟期植株钾素积累量,对分蘖期至抽穗期钾素积累量无影响,施氮肥能够提高水稻植株的钾素积累量。

Moisture and nitrogen influence the growth of rice. In this experiment, we use cold-region rice variety Dongnong 428 as material to study the effect of nitrogen levels on rice nutrient absorption under water-saving irrigation and conventional irrigation. The results showed that N accumulation decreased at tillering stage and increased at heading and maturity stages with water-saving irrigation. Nitrogen significantly improved plant nitrogen accumulation and its accumulation increased as the amount of nitrogen increased. The amount of phosphorus accumulation in water-saving irrigation was higher than that in conventional irrigation under the same nitrogen level, and phosphorus accumulation at different growth and development stages increased as the level of nitrogen increased, with a peak of accumulation appearing at the nitrogen level of 125 kg·hm-2and 150 kg·hm-2.Compared with conventional irrigation, the accumulation of potassium of mature rice increased, but had no difference from tillering to heading stages, and nitrogen fertilizer could increase the amount of potassium accumulation in rice plant.