油莱、豌豆茬对土壤肥力和微生物影响的探讨

研究了不同茬口对土壤肥力的结果表明,豌豆茬好,小麦茬差,油菜茬居中。豌豆茬、油菜茬和休闲地肥力水平接近,产量无明显差异。豌豆茬、油菜茬后作产量高,有益微生物数量多,特别是固氮菌和纤维素分解菌占优势。休闲茬有效养分虽高,但却消耗了土壤潜在的肥力。

A Discussion About Effects of Rape and Pea Residues Upon Soil Fertility and Microorganisms

Studying the effects of various crop residues upon soil fertility shows that the fertility of pea residue fields is good;that of wheat residue fields is poor;and that of rape residue fields is in the middle. Land fertility of pea and rape residue fields is close to that of fallow lands So that there is no distinct difference in crop yields among them.The yields of after-reap crops in pea and rape residue fields are high because there has been the great number of beneficial microor- ganisms,of which the Azotobacter chroococcum and cellulosedecompo- sing bacteria have a domiant ,quantity.Although the available plant nutrients in fallow lands are high,the potential soil fertility in them has been exhausted.