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用涂层尿素、长效尿素、长效碳铵 3个长效氮肥品种与普通尿素进行盆栽试验 ,结果表明 :( 1)普通尿素在第四纪红土赤红壤上氨的挥发损失比涂层尿素、长效尿素和长效碳铵多 0 16 0 %～ 0 894% ,在浅海沉积赤红壤上与长效碳铵相当 ,比其余的两种长效氮多 4 7%～ 2 6 5 % ;( 2 )涂层尿素、长效尿素、长效碳铵和普通尿素在粽色石灰土和第四纪红土赤红壤上供氮过程和水平有较大的差异 ;( 3)在第四纪红土赤红壤上 ,施长效氮肥的玉米干生物产量比施普通尿素增产 7 5 %～ 16 7% ,长效氮肥氮素利用率较普通尿素提高 2 3～ 8 7个百分点 ,施长效氮肥土壤中速效氮的残留比普通尿素高 3～ 4mg/kg。
The results showed that: (1) The ammonia volatilization loss of ordinary urea in Quaternary lateritic red soil was lower than that of coated urea , Long-acting urea and long-acting ammonium bicarbonate were 0 16 0% ~ 0 894%, which were equivalent to long-acting ammonium bicarbonate in shallow-sea sedimentary red soil and 47.7% ~ 26.5% more than the other two long- (2) There is a big difference in the process and level of nitrogen supply between coated limestone, long-acting urea, long-acting ammonium bicarbonate and common urea in brown clay soil and quaternary red clay soil. (3) In red soil, the dry matter yield of maize with application of long-acting nitrogen fertilizer increased by 75% -167% compared with normal urea, and the utilization efficiency of long-term nitrogen fertilizer increased by 23.77% than normal urea. Residues than ordinary urea 3 ~ 4mg / kg.