Soil Fertility Improvement by Mixed Planting of Leguminous and Gramineous Green Manure Crops
The effects of mixed planting of leguminous and gramineous green manure crops on fresh bi-omass and soil properties were investigated with a four-factor simple center mixture design. The mixture of vetch, hairy vetch and millet, with seeding rate 75. 0kg/hm2, 30kg/hm2 and 20kg/hm2 respectively, was one of the most productive patterns. After sowed in mixture during wheat flowering time, fresh biomass of all three crops yielded over 36138kg/hm2, which was 34. 6% , 1. 9% and 156.3% more than those of monoculture of vetch, hairy vetch and millet separately. The residues of roots in the mixture was 3534kg/hm2, which was 81. 4% ,67. 2% and 28. 9% more than those of corresponding monocultured vetch, hairy vetch and millet, respectively. The soil fertility of the mixture was improved, compared with three monoculture cropping. Soil organic matter, total N, available N, available P in the mixture were increased by 0. 148 ~ 0. 43g/kg,-0. 44 ~ 0. 11g/kg, 2. Lmg/kg and lmg/kg, respectively, and bulk density was decreased by 0. 01 ~0. 02g/cm3, and soil porosity was increased by 0. 33%~0. 66%, compared with corresponding monocultured cropping. The results indicated that technique of leguminous and gramineous mixed sowing increases fresh forage biomass and root residues, and improves soil fertility and physical properties.
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NSTL
万方数据
维普
