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在江苏扬州黄粘土和砂壤土上设置免耕、少耕田间试验,并取上述大田土壤进行培养试验,测定生产力.探索土壤肥力自调效应.结果表明土壤自身对容重有自调功能,种植一年稻、麦后,容重小的逐步变大,大的逐步变小,砂壤土和黄粘土容重极差由0.6降到0.2和0.27(稻季),麦季极差降到0.12和0.17.自调速率以砂壤土为快.此后随时间推移,不同容重渐趋自调点1.3克/cm~3左右.这种自调性在田间不同耕法处理区得到重现.土壤养分、土壤微生物和孔隙均有自调能力.认识土壤的自调规律,进行少耕免耕,对发展农业生产有着重要的意义.
No-tillage and no-tillage experiments were conducted on yellow clay and sandy loam in Yangzhou of Jiangsu Province, and the above-mentioned field soil was used for culture experiments to determine the productivity and to explore the self-tuning effect of soil fertility.The results showed that the soil itself had self- After rice and wheat, the bulk density gradually increased and the soil bulk density gradually decreased. The bulk density of sandy loam and yellow clay decreased from 0.6 to 0.2 and 0.27 (rice season) respectively, and the wheat season declined to 0.12 and 0.17 The rate of change was faster with sandy loam than that of the other tillage treatments.After that, over time, the self-regulated self-regulation varied from about 1.3 g / cm ~ 3 to different tillage treatments in different fields.The soil nutrients, soil microbes And pores have self-adjusting ability.According to the law of self-regulation of soil and the reduction of tillage and no tillage, it is of great significance to the development of agricultural production.