過耕および Puddling が土壤団粒に及ぼす影響について
1956 年 18 巻 3 号 p. 101-104
詳細
1956 年 18 巻 3 号 p. 101-104
It is the big problem which should be considered together with the study on farming machineries, especially cultivating machinery which have attained a remarkable improvement and development in their faculty, then what is the effect on the aggregates structures to be made by the application of the farming machineries.
Meanwhile, as discussed in this paper, there to-fore-adopted methods of experiment is rather unadvisable for the exact comprehension of the status of the aggregates structures, because they often result an unfavourable aggregates dispersion, for which stabilization of the grains is resultantly necessitated.
Comparison has been made with a varied conditions of the soil moisture for each cultivation with the addition of hydrolyzed polyacrylonitrile as a stabilizer, in our experiment which have proved that puddling has a lowest stability of aggregates of both clayey loam and loam for 0.02%, 0.05%and 0.12% additions of the said stabilizer, which are especially prominent for clayer loam, and that for excessive cultivation the alike tendency can also be observed, requring a addition% of stabilizer, considerably different from other normal cultivations.
