大颗粒尿素在水稻上的应用效果及合理施用量

Effect of big granulated urea and it's rational application on paddy rice

通过田间试验研究了尿素形态对水稻生长及发育的影响,并应用二次饱和D 最优设计研究了水稻的氮磷肥合理施用量。结果表明,氮肥是水稻产量构成的主要影响因子,施尿素使水稻的株高、穗长、穗粒数、穴穗数等各项生育指标都有显著增长;大颗粒尿素对上述各项生育指标的影响又优于普通尿素,并最终在产量上比普通尿素增产显著。但高施氮肥使成穗率和千粒重降低,产量受影响。应适量施氮肥,并配合施磷肥。宁夏灌区水稻的最大利润施N肥量为168kg/hm2,施P2O5量为47 55kg/hm2。

Studied on the effects of Urea types on rice growth and rational application of N, P fertilizers on rice by means of Quadratic Saturated D-Best Design. The results showed that nitrogen was the key constructive factor to rice yield. The height of stalk, the length of ear, the granulates of ear and the ears of every stem are increased notably after supplying N fertilizer. The effect of big granulated Urea was better than common Urea on rice growth characteristics and yield. However, high quantity of N fertilizer reduced ear rating and the weight of grains. Therefore,the yield was decreased. It was needed to applying N and P fertilizers coordinately and rationally. The amount of maximum profit of N and P(P_2O_5)should be 168 kg/hm^2 and 47.6 kg/hm^2 respectively.