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通过田间试验,研究了氮释放期为30和60d的树脂包膜尿素(PCU30、PCU60),硫包衣尿素(SCU),抑制剂型缓释尿素(UI)和普通尿素(U)对高羊茅草坪生长、氮素吸收及氮素挥发的影响。结果表明,在全年施氮量260kg/hm2的情况下,PCU30、PCU60和SCU一年分春秋2次施用可以满足高羊茅草坪正常生长需要,其草屑累积量和氮素吸收量显著高于普通尿素一年4次施用处理;氮素气态损失方面,UI处理的氨挥发损失氮量高达44.42kg/hm2,显著高于其他施氮处理,其N2O排放氮量为6.46kg/hm2,显著低于其他施氮处理;PCU30、PCU60、SCU处理的氨挥发量和N2O排放氮量分别为17.67,13.59,18.54kg/hm2和8.14,6.92,9.91kg/hm2,显著低于U处理。综合考虑各种因素,建议高羊茅草坪一年分春秋2次施用树脂包膜尿素PCU60较为适宜,可有效提高肥料利用率、降低氮素挥发损失,环境效益明显。
Field experiments were conducted to study the effects of resin coated urea (PCU30, PCU60), sulfur coated urea (SCU), controlled release urea (UI) and common urea (U) Turfgrass growth, nitrogen uptake and nitrogen volatilization. The results showed that PCU30, PCU60 and SCU could be used twice a year in spring and autumn to meet the normal growth requirements of tall fescue turfgrass with a high annual nitrogen application rate of 260 kg / hm2, with significantly higher contents of cut grass and nitrogen uptake As for nitrogenous gas loss, the amount of nitrogen lost by UI treatment was 44.42kg / hm2, which was significantly higher than that of other nitrogenous treatments, and the N2O emission was 6.46kg / hm2 Which was lower than that of other treatments. The ammonia volatilization and N2O emissions of PCU30, PCU60 and SCU were 17.67, 13.59, 18.54 kg / hm2 and 8.14, 6.92 and 9.91 kg / hm2, respectively, which were significantly lower than those of U treatment. Considering all kinds of factors synthetically, it is suggested that tall fescue turf should be applied with resin coated urea PCU60 twice a year in spring and autumn, which can effectively increase the utilization rate of fertilizer and reduce the loss of nitrogen volatilization, and has obvious environmental benefits.