割草机土壤压实与苜蓿产量相关性研究

Correlation study of soil compaction by mowing machine and alfalfa yield

通过田间试验研究了ＨＷ３２０型割草机压地１～１０遍过程中的苜蓿地土壤压实问题，分析了土壤体积密度、土壤坚实度与苜蓿产量的相关性。研究表明，苜蓿地机械碾压引起了不同深度土壤体积密度与土壤坚实度的增加，土壤体积密度与压实次数的对数ｌｇＮ成正比，压实引起了苜蓿减产。随压实次数变化，土壤体积密度与苜蓿产量成负相关关系，可用二次方程表示。土壤坚实度与苜蓿产量成负相关关系，０～２０ｃｍ土层土壤坚实度与苜蓿产量的相关度高，可用二次方程表示。

Soil compaction problems resulted from 1--10 passes of a HW320 mowing machine along the same track in field tests. The correlations between soil bulk density, soil hardness and alfalfa （Medicago sativa） yield were analyzed. Soil bulk density and soil hardness in different depths were increased because of alfalfa soil com- paction and the soil bulk density was directly proportional to lg N of the number of compaction times. Alfalfa yield was reduced because of soil compaction. There were negative correlations between soil bulk density and alfalfa yield, which can be represented by quadratic equations. Soil hardness was also negatively correlated with alfalfa yield, the correlation of soil hardness at 0 to 20 cm soil depth with alfalfa yield is high and can be repre- sented by