Subsoil tillage was an effective way to improve and utilize the compact soda-alkaline land with high soil bulk density.
深松措施可作为土壤紧实、容重较高的苏打盐碱土改良与高效利用的有效耕作方式加以实施。
The results indicated that green coverings improved soil physical characteristics, soil bulk density decreasing by 5.68% and the soil porosity increasing by 6.15%.
结果表明：生草可改善土壤物理性状，使土壤容重平均降低5.68%，总孔隙度提高6.15%。
Maize straw returning to the field also decreased soil bulk density.
秸秆还田还降低了土壤容重。
So the effect of plant roots should be considered in the calculation of soil bulk density.
在土壤容重计算过程中，应考虑植物根系的作用。
The vertical transport of nitrate-N was also affected by the soil bulk density and the organic matter content.
土壤容重和有机质含量对硝态氮的垂直运移有很大的影响；
The soil bulk density and moisture content are main factors influencing the draft resistance and power consumption of tractors.
土壤容重和含水量是影响机具耕作阻力和能量消耗的主要因素。
Infiltration rate of soil and infiltration time have power function, but between the infiltration rate and soil bulk density, they have a negative correlation.
土壤入渗速率与入渗时间呈幂函数关系，但入渗速率与土壤容重呈负相关关系。
The physical character of soil was also improved after covering straw. The soil bulk density was reduced. Field moisture capacity and porosity percentage were increased.
覆草后土壤的物理性状也得到改善，土壤容重降低、田间持水量和孔隙度提高。
When the soil bulk density water content is between 15% to 45%, the calibration curve is approximately a straight line, and the intercept and slope are only influenced by the above factors.
当土壤容积含水量为15 ~ 45%时，校正曲线近似为一直线，其他因素只改变直线的截距或斜率。
Four kinds of amendments can improve soil physical properties. Soil bulk density decreased, soil porosity, permeability coefficient and field capacity increased under treatments.
四种改良剂均能不同程度的改善土壤物理性状，能降低土壤容重，提高土壤总孔隙度，加快渗透速度，增加田间持水量。
Four kinds of amendments can improve soil physical properties. Soil bulk density decreased, soil porosity, permeability coefficient and field capacity increased under treatments.
四种改良剂均能不同程度的改善土壤物理性状，能降低土壤容重，提高土壤总孔隙度，加快渗透速度，增加田间持水量。
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