Research on ecological effect of wheat with plastic film in dry land

The mulched planting technique with plastic film has a high ecological effect．It can increase soil water storage capacity in arid land．In comparison with different tillage systems，it is more effective on soil moisture content than the method of furrow drilling beside plastic film,the water content increases by 2．1％ in wintering and 1．6％ in shooting；it has more effects on the increase of soil temperature before winter while using hole seeding on plastic film，the total temperature increa ses by 160^。C and the quantity of soil microbe increases．In treatment of furrow drilling beside plastic film ，the soil microbe can be increased in varying degrees ，the wheat yield and utilization efficiency of nutrient can be improved，in which the high capacity of total N can reach 166．5kg/hm² and the total P can reach 22．1kg／hm²．