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水稻吸收肥料氮与吸土壤氮的情况很不相同.由于化学氮肥的施用量有一定限制。水稻对肥料氮的吸收率也较小,所以要水稻高产,不能对化肥的期望过高,必须充分注意土壤氮的作用.水稻牛育期间对肥料氮的吸收,是在分蘖期对基肥氮的吸收达到高峰.然后急剧下降:而对追肥氮的吸收则时间很短.与此相反,水稻对土壤氮的吸收在整个生育期都是缓慢连续进行.为了保证水稻在理想条件下生育,必须保持肥料氮与土壤氮之间的供应平衡.因此,掌握水稻生育期间土壤氮的矿化量变化的规律极为重要.
There is a very different situation between rice absorbing fertilizer N and soil N uptake because of the limited application of chemical nitrogen fertilizer. Rice nitrogen fertilizer on fertilizer absorption rate is also small, so to high yield rice, fertilizer expectations can not be too high, must pay full attention to the role of soil nitrogen. Rice nitrogen fertilizer during cattle breeding during nitrogen fertilizer at the tillering stage of nitrogen Absorption reached its peak, then dropped sharply: while the uptake of topdressing nitrogen took a very short time, rice absorbed slowly to the soil during its entire growth period.In order to ensure that the rice was born under ideal conditions, it had to be maintained Fertilizer supply of nitrogen and soil nitrogen supply balance.Therefore, to master the rice growth during the mineralization of soil volume changes in the law is extremely important.