Studies on Improvement of Field Soil by Short Term Pasture Rotation : I. Effect of clover rotation on chemical properties of soil : II. Effect of clover rotation on physical properties of soil

[摘要] For the purpose of clearing up the effects of clover rotation on the chemical and physical properties of field soil, this study was carried out. The results obtained are as follows: 1) Short term rotation of clover increased humus content remarkably and adjusted the soil reaction in surface soil compared with the common cropping system (growing wheat and sweet potato alternately). 2) Formation of water stable soil aggregates was promoted remarkably by clover rotation, particularly that of larger aggregates as 3.0 mm < diameter. 3) It seems that "Summer withering" of clover may be caused by the dry condition, under which clover cultivation reduced liquid phase of surface soil and produced so much hard greater clods in subsoil.

[学科分类] 农业科学（综合）