摘要
岗地白浆土低产的原因主要是黑土层薄,白浆层养分贫瘠,通透性能差,因此作物产量一直很低,几年的试验说明,多年生豆科牧草沙打旺和苜蓿对改良白浆土的理化性质有重要作用,龙其沙打旺作用明显,三年后可使紧实的白浆层土壤容重降低0.23克/厘米~3,增加有机质0.84％,全N0.064％,全P0.032％,速效氮6.003毫克/100克土.
The reasons that led to a low crop yeild on the upland lessive are Ap horizon thin, nutrient of Aw horizon is poor and its perviousness is bad. Hence crop yield has been being very low ever since. The result of the experiment for several years shown that the perennial legumes Astragalus and Medicago played an important part in improving physical chemistry properties of lessive. The effect of Astragalus was more outstanding in improving the lessive. considering compact Aw horizon, growing Astragalus could decrease the bulk density 0.23g/cm^3, increase the organic matter 0.84%. total N 0.064%, total P 0.032% and available N 6.003mg/100g after it was planted in three years.
出处
《中国草地》
CSCD
1991年第1期17-20,共4页
Grassland of China
