Influence of Planting Melilotus Offcinalia(MO) on Water and Salt in Saline-Alkali Soil

According to the circumstances of Da′an site,series tests including soil moisture,bulk density,field moisture capacity and total salt were carried out using saline-alkali soil samples collected in the field in different regions and different times.The changes of soil bulk density,field moisture capacity,total salt and soil organic matter before and after the planting of MO were analyzed and the saline-alkali soil improving effect of the area planted with MO was compared to the uncultivated area on the basis of experimental data obtained in June and October.The results were as follows: in the same reason,the soil bulk density and field moisture capacity in planting area were higher than unplanting area,which showed that the water-holding capacity increased;in MO planting area,from June to October,the soil total salt and pH decreased by 260.61 mg/100g and 0.3 respectively,organic matter content increased by 0.002 8 g/kg,and it had a more noticeable improvement than unplanting area.All of the results indicate that MO has an apparent function on improving soil structure.It provides a more effective biological technique on improving saline-alkali soil.