包膜尿素对旱地红壤氮素垂直迁移特征的影响

结合花生田间试验,利用原位土壤溶液取样装置,研究了一次性基施包膜尿素对典型红壤旱地0～100cm深度土壤溶液氮(N)素垂直迁移特征的影响。结果表明,①旱地0～100cm土层红壤溶液N素含量以NO3-N含量最高,且以包膜肥料处理较明显;②对照处理0～100cm土层红壤N素含量变化不大,而普通尿素和包膜尿素处理0～60 c...

Effects of resin coated urea on nitrogen vertical migration in red soil dryland

Based on an in situ peanut field experiment, the vertical migration of solution nitrogen in red soil dryland was studied under the application of resin coated urea as a basic fertilizer. The results showed that at 0-100cm depth, the concentration of NO3--N was the highest in various N-forms, particularly in the treatment of resin coated urea applied (BN treatment). The variation of nitrogen concentration at 0-100 cm was smaller under CK treatment (no nitrogen fertilizer used), but were greater at 0-60 cm under BN treatment and PN treatment (routine urea applied), especially at the florescence stage. Compared with PN treatment, BN treatment kept a higher nitrogen supply capacity for a longer time at cultivated horizon (0-40cm) and reduced nitrogen downward migration. However, when resin coated urea was applied as base fertilizer with an amount of N 150 kg/hm2 in red soil dryland, a weak-assorted relation occurred between nitrogen release of resin coated urea and nitrogen absorption of peanut, thus the application amount of resin coated urea still needs to be adjusted.