Amelioration effect of water repellency by tillage
In order to eliminate the negative influence of soil water repellency on agricultural production , two kinds of strong water-repellent soils (clay and sand) collected from Israel was used to investigate the amelioration effect of tillage on water repellency of soil. Sixteen treatments in total, including four depths (0-2.5 cm, 0-10 cm, 0-20 cm, 0-30 cm) of tillage, planting (cabbage) or not, were set in experimental pots. The treatments with planting were tilled in every 4 months and those without planting weren 't tilled during the experiment for one year. Water Drop Penetration Time ( WDPT) of soil was measured before and after each tillage applied for every treatment. After analyzed and compared the WDPT, the results show that tillage can eliminate the repellency for a while, but the repellency reoccurs after irrigation for a period of time. The water repellency disappears after the soils experiences many times of tillage; moreover the amelioration effect of repellency shows a significant positive correlation to number, duration and depth of tillage. The amelioration effect of tillage on clay soils is more obvious than on sand ones. The results can provide the evidence that a physics method can improve the water repellency of a soil.
soil water repellencytillagesoil ameliorationclaysand
国家科技期刊平台
NSTL
万方数据
维普
