近年来我县稻田由于绿肥等有机肥料减少,单纯依赖化肥肥田,致使稻田地力明显下降,和60年代相比土壤有机质含量一般下降0.5％～1％。土壤元素比例失调,缺磷、钾、镁、硅、锌、硼现象普遍。同时土壤理化性状变劣,耕层一般变浅3～5厘米,酸碱度下降0.3～1。随着铵态氮肥的大量施用,加速了土壤结构的破坏,通透性变差,削弱了调节土温、保水、保肥的能力。目前我县稻田的化肥用量 In recent years, due to the reduction of organic fertilizers, such as green manures, the paddy fields in our county only relied on fertilizers and fertilizers, resulting in a marked decline in soil fertility. Compared with the 1960s, soil organic matter generally decreased by 0.5% to 1%. Soil elements imbalance, phosphorus deficiency, potassium, magnesium, silicon, zinc, boron prevalence. At the same time soil physical and chemical properties worsened, generally shallow 3 to 5 cm, pH decreased by 0.3 to 1. With the massive application of ammonium nitrogen fertilizer, accelerated the destruction of soil structure, permeability deteriorated, weakened regulation of soil temperature, water retention, fertilizer and the ability. At present, the amount of fertilizer in paddy fields in our county