摘要
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)。
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.
关键词
甜菜
冬季休闲期
硝态氮
下渗强度
sugarbeet,winter fallow period,nitrate nitrogen,Leaching intensity
