包膜尿素对水稻的增产效应及提高氮素利用率的研究

随着经济的发展,国内包膜肥料逐渐得到应用,包膜肥料施用方便,肥效期长,在国内应用潜力巨大.本文通过田间试验比较了硫磺加热固性树脂包膜尿素与普通尿素对水稻的增产效应,研究表明,在低N水平下产量比施用普通尿素增加了22.2%,增产效果显著:N素利用率分别为76.9%和37.8%:在收获期,同等N素水平下,包膜尿素处理的植株含N量显著高于普通尿素,分别高出24.1%和20.0%.施用包膜尿素减缓了N素的释放,一次性施肥就能够满足水稻整个生育期的营养需求,大大节约了劳动力,并且在低N水平下获得了较高的经济效益.

Effects of Coating of Urea on Yield and Nitrogen Recovery of Rice

For its advantages of easy handling and long availability, coated fertilizer finds tremendous potential of application in China. Field experiments were conducted to compare polypropylene-coated urea with common urea in yield-increasing effect on rice. Results showed that yield of the crop was increased by 22.22% in the low urea treatments; nitrogen use efficiency of the coated urea and common urea treatments was 76.88% and 37.75%, respectively; and N content shoots of the rice in coated urea treatments was 24.09% and 20.03% higher than that in common urea treatments. Coating controlled N release and one application was enough to meet the nutrient requirements of the crop throughout its life cycle. Moreover, it saved much labor and gained considerable economic benefit at a lower N application rate.