论文部分内容阅读
采用磷酸盐包膜工艺制成长效尿素PCU,含N 33.8%,全磷(P)5.15%,有效磷(P)4.10%。同日本产品SCU和IBDU进行了盆栽和田间小区及微区试验,发现:(1)PCU作基肥穴施其供氮强度和供氮容量均高于SCU和IBDU;(2)PCU在红壤上对中稻的产量效应显著高于普通尿素分次施。但在黄泥土和白土上对单晚的肥效不及普通尿素分次施;(3)PCU作基肥穴施在中稻上其氮素利用率最高,达到79%,而SCU和IBDU作基肥混施以及普通尿素分次施的氮素利用率分别为60%,42%和34%;(4)长效肥的后效与释放率呈反相关的趋势,即释放率越低,后效越长,如释放率最低的IBDU的后效比SCU和PCU分别高89%和47%。
Long-acting urea PCU was prepared by phosphate coating process, containing 33.8% N, 5.15% total phosphorus (P) and 4.10% available phosphorus (P). Potted and field plots and field experiments were conducted with Japanese products SCU and IBDU. The results showed that: (1) PCU as basal fertilizer applied nitrogen and nitrogen supply capacity higher than SCU and IBDU; (2) PCU on red soil The yield effect of medium-sized rice was significantly higher than that of ordinary urea. However, the effect of single cropping on yellow soil and clay was inferior to that of ordinary urea. (3) PCU had the highest nitrogen utilization rate of 79% on middle rice, while SCU and IBDU were used as basal fertilizer combination and The nitrogen utilization rate of common urea application was 60%, 42% and 34% respectively. (4) After-effect and release rate of the long-acting fertilizer showed an inverse correlation trend, that is, the lower the release rate, the longer the post- For example, IBDU with the lowest release rate had 89% and 47% respectively higher after-effects than SCU and PCU.