【摘要】 采用田间小区试验,比较了两种硫包衣尿素(SCU1,SCU2)在等N量或减N30%的情况下对辣椒产量、品质、N肥利用率的影响及其后效的差异。结果表明:①与普通尿素相比,等N量和减N30%的两种硫包衣尿素增加了辣椒产量(增产幅度为2.8%～16.6%)和Vc含量(增加幅度为3.5%～10.2%),且SCU1增加Vc含量效果明显而SCU2增产效果明显,这可能与二者的包膜厚度有关(SCU1包膜较薄,SCU2包膜较厚);②普通尿素和等N量的两种硫包衣尿素之间N肥利用率和偏生产力没有显著差异,但是等N量的SCU2的农学效率要显著高于普通尿素和等N量的SCU1,而减N30%的SCU1和SCU2的N肥利用率、农学效率和偏生产力显著高于普通尿素和等N量的SCU1和SCU2;③普通尿素、等N量和减N30%的SCU1和SCU2的后茬作物浙江长莆瓠子的产量差异不大,但是这些施肥处理的后茬作物产量均显著高于不施肥处理,表明前茬作物施用的肥料可以被后茬作物加以利用。上述这些结果表明硫包衣尿素能够提高辣椒产量和Vc含量而没有提高N肥利用率,且SCU2增产效果优于SCU1,SCU1增加Vc含量优于SCU2。更多还原

【Abstract】 The effects of two different sulfur coated urea fertilizers (SCU1, SCU2) on green pepper’s yield, quality and nitrogen use efficiency were studied under the conditions of equal or 30%-decreased nitrogen inputs by field experiment. The results showed that the equal and 30%-decreased application of SCU1 and SCU2 fertilizers increased significantly the yield from 2.8% to 16.6% and Vc content from 3.5% to 10.2% compared with the urea treatment, and SCU2 increased the yield higher than SCU1 but SCU1 increased Vc content higher than SCU2, probably because of their differences in the thickness of coat. There was no significant difference in N recovery efficiency and partial productivity between the urea and the equal N sulfur coated urea, but the application of equal N SCU2 increased significantly N agronomic efficiency compared with the urea treatment and the equal N SCU1. N recovery efficiency, N agronomic efficiency and partial productivity of 30%-decreased N SCU1 and SCU2 were significantly higher than those of the urea and equal N SCU1 and SCU2. No significantly difference in the yields of next crop was observed between the urea and sulfur coated urea, but the yields of next crop under the urea treatment and sulfur coated urea were significantly higher than that without fertilizer application. In conclusion, sulfur coated urea increased the yield and Vc content of green pepper but not N recovery efficiency, and SCU1 was better than SCU2 in increasing Vc content while SCU2 better than SCU1 in increasing the yield.更多还原