引言近年来,当郊区水稻插秧二,三周后,或旱种水稻长到四、五个叶片时,稻苗不长,叶子发黄、发白,可越施肥越不长,这十有八、九都是由于微量元素缺乏引起的生理病害.随着我国化学工业的发展和复种指数的提高,生产中过量滥用氮素化肥的问题已经越来越严重,乱施磷肥的现象也相当普遍.这不仅造成单位肥料报酬率的下降和生产成本的增 Introduction In recent years, when the suburban rice transplanting two or three weeks later, or dry up paddy rice grow to four or five leaves, the rice is not long, the leaves yellow, white, the more fertile the less long, these ten , Nine are due to the lack of trace elements caused by physiological diseases.With the development of China’s chemical industry and the index of multiple crop up, the problem of excessive use of nitrogen fertilizer in production has become more and more serious, and the phenomenon of indiscriminate application of phosphate fertilizer is quite common. This not only resulted in a drop in the rate of return on unit fertilizer and an increase in production costs