冬季休闲期间土壤剖面硝态氮的移动

本文介绍了1984～1986年,在南斯拉夫甜菜主产区——伏伊伏丁那自治省进行的田间试验,结果表明,冬季休闲期间,碳酸盐黑钙土中无硝化与反硝化作用。土壤中残留的和秋季施入的硝态氮,随冬季降水下渗深度平均达160 cm,绝大部分积累在30～120 cm土层,并以60～90 cm最高。每毫米降水使硝态氮下渗0.53～0.82 cm。应用抛物线法计算定积分值公式,求得硝态氮下渗强度变化在2.28 ppm cm·mm~(-1)～8.21 ppm cm·mm~(-1)。

THE MOEMENT OF NO_3-N ALONG SOIL PROFILE DURING WINTER FALLOW PERIOD

A field experiment was conducted in 1984～1986 on chernozem soil in Vo vodina Autonomous province, the sugarbeet main production region in Yugoslavia, to study the movement of NO_3—N along 180cm soil profile during winter fallow period.The results were as follows:There were not nitrification and denitrification in the chernozem soil layer of 180cm during winter fallow period vo vodina region.Leaching depth of No_3-N in soil treatments after winter ranged from 120 to 180 cm, of which most amount of soil NO_3-N accumulation was in the soil layer from 30 to 120 cm, One mm rainfall brought about 0.53～0.82cm, 0.72cm in average soil NO_3-N Leaching. Leaching intensity of soil NO_3-N ranged from 2.28 ppm cm.mm~(-1) to 8.21ppm cm.mm~(-1), and the intensity increased with the increasing of N fertilizer.It is possible to apply N fertilizer for sugarbeet only once at the end of autism in the herrnozem soil region where the precipitation is lower than 250 mm during winer fallow period.