包膜控释尿素对冬小麦产量和氮肥利用率的影响

The Effect of Controlled-release Coated Urea on Wheat Yield and Apparent N Recovery Rates

采用田间小区试验方法,研究了不同类型土壤施用包膜控释尿素对冬小麦产量和氮肥利用率的影响。结果表明,30%普通尿素＋35%控释期90 d包膜尿素＋35%控释期120 d包膜尿素配合施用（F1）冬小麦籽粒产量最高,氮肥利用率也达到最高,比40%尿素底施＋60%尿素拔节期追施（F2）增产5.36%-7.16%,氮肥利用率也提高了13.03%-16.73%。在0-40 cm土层中,30%控释期30 d包膜尿素＋35%控释期90 d包膜尿素＋35%控释期120 d包膜尿素一次性底施（F3）土壤残留氮最高,土壤表观损失最少。

Field plot experiments were conducted to investigate the effects of controlled-releases coated urea on wheat yield and apparent N recovery rates. The yields and apparent N recovery rates of 30%urea, 35% coated urea with releasing time in 90 d and 35% coated urea with releasing time in 120 d mixed application （F2） were the best. Compared with 40% basal to 60% top dressing urea applied at jointing stage （F1）, the yields and apparent N recovery rates of F2 increased by 5.36% - 7.16 % and 13.03 % - 16.72 %, respectively. From 0 - 40 cm depth of soil, 30 % coated urea with releasing time in 30 d, 35 % coated urea with releasing time in 90 d and 35 % coated urea with releasing time in 120 d mixed application （F3） had the highest soil residual N. And soil apparent N loss of F3 were the lowest in all treatments.