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本文采用玉米、高梁~(15)N示踪微区试验,对硝酸铵在白浆土、草甸黑土、淡黑钙土上施用的后效与残留分布进行了研究,结果表明:硝酸铵在三类土壤上施用,当年的残留氮平均占施入氮量的15～30％,施后第2、3年分别为12～22％,8～10％。在各类土壤中的残留量,三年结果都是白浆土>淡黑钙土>草甸黑土。残留氮集中分布在0～40cm的土层中,其量占残留氮量的84～93％,只有7～16％分布于40cm以下的土层中。硝酸铵施后三年总利用率平均为61.21％,硝酸铵施后第2、3年的总利用率为2.12％。硝酸铵有明显后效。
In this paper, corn, sorghum ~ (15) N tracer micro-area experiments were conducted to study the after-effect and residual distribution of ammonium nitrate on white soil, meadow black soil and calcareous soil. The results showed that ammonium nitrate Three types of soil application, the year’s residual nitrogen accounted for an average of 15 to 30% of nitrogen application, the second and third year after application were 12 to 22%, 8 to 10%. Residues in all types of soil, the three-year results are albic soil> light chernozem> meadow black soil. Residual nitrogen concentrated in 0 ~ 40cm soil layer, the amount of residual nitrogen content of 84 ~ 93%, only 7 ~ 16% distributed in the soil below 40cm. The average total utilization rate of ammonium nitrate after three years was 61.21%, and the total utilization rate of second and third years after ammonium nitrate application was 2.12%. Ammonium nitrate has obvious after effects.