氮素是水稻生长发育过程中必需的营养元素,也是生产上用量最多的肥源。目前,在我国农业生产水平还比较低,有机肥料不足,化学肥料也比较少的情况下,水稻生产中合理施用氮肥,最大限度地发挥氮肥的增产效果具有十分重要的现实意义。在这方面,国内外对于水稻栽培中氮素肥料的施用方法,概括有如下五种:①一餐饱(或一轰起):此法多用于早熟品种的栽培,认为早熟品种 Nitrogen is an essential nutrient in the growth and development of rice and is also the most abundant source of fertilizer in production. At present, with the low level of agricultural production in our country, the shortage of organic fertilizers and the relatively low amount of chemical fertilizers, it is of great practical significance to use nitrogen fertilizer rationally in rice production to maximize the stimulation effect of nitrogen fertilizer. In this regard, at home and abroad for the application of nitrogen fertilizer in rice cultivation methods, summarized in the following five: ① meal (or a bang): This method is mostly used for early maturing varieties that premature varieties