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通过田间试验,研究控释氮肥在田间的养分释放特征及其在玉米生长期内养分需求和氮素供应状况以及对土壤无机氮、玉米产量和氮肥利用率的影响。结果表明,控释氮肥的养分释放达到了控释效果,其养分释放与玉米的养分吸收规律基本一致。与普通氮肥相比,施用控释氮肥有效地提高土壤中的无机氮含量,促进玉米植株对氮素的吸收利用。施用控释氮肥处理的玉米吸氮量比普通氮肥处理增加8.41%,玉米产量较普通氮肥增产720 kg/hm~2,氮肥利用率较普通氮肥处理高10.13个百分点,氮肥农学效率较普通氮肥处理高19.48%。
The field experiment was conducted to study the nutrient release characteristics of controlled release nitrogen fertilizer in the field and its nutrient demand and nitrogen supply status during maize growth stage and the effects on soil inorganic nitrogen, corn yield and nitrogen use efficiency. The results showed that the release of controlled-release nitrogen fertilizer reached a controlled release effect, and the nutrient release and nutrient absorption of corn were basically the same. Compared with common nitrogen fertilizer, the application of controlled release nitrogen fertilizer effectively increased the content of inorganic nitrogen in soil and promoted the absorption and utilization of nitrogen by corn plants. The nitrogen uptake by corn with controlled release nitrogen fertilizer was 8.41% higher than that with normal nitrogen fertilizer, corn yield was 720 kg / hm ~ 2 higher than common nitrogen fertilizer, and the utilization rate of nitrogen fertilizer was 10.13 percentage points higher than that of common nitrogen fertilizer. The agronomic efficiency of nitrogen fertilizer was higher than that of common nitrogen fertilizer treatment High 19.48%.