使用缓控释肥的原则是肥料的养分释放规律要与作物的养分需求规律同步。释放期太长,玉米生长前期氮素供应不足,发苗差,影响后期生长和产量形成;释放期太短,氮素在生育前期释放量大,容易出现烧苗现象和加剧氮肥损失,而中后期氮素供应不足,最终影响产量。 The principle of using controlled release fertilizer is that the nutrient release law of fertilizer should be synchronized with the nutrient demand of crops. The release period is too long, the early stage of maize supply of nitrogen deficiency, poor seedling, affecting the late growth and yield formation; release period is too short, nitrogen release in early growth stage, prone to the phenomenon of burning seedlings and aggravate the loss of nitrogen fertilizer, Nitrogen supply late, the final impact of production.