EFFECT OF SHALLOW TILLAGE ON WEED SEED, SOIL MOISTURE, AND CROP YIELD

摘要

Field experiments were conducted to determine the effect of tillage system on distribution of weed seed, soil moisture, and crop yield. Results indicated that timely shallow tillage after harvest could put 85-90% weed seed into 0-10 cm depth of soil. Shallow tillage system could provide suitable conditions for weed seed germination and emergence, subsequently increased the possibility of weed control by herbicide. Shallow tillage in combination with herbicide application could decrease the impact of weed to crop in 2-3 years. Further more, shallow tillage system reduced 50% of irrigation water and increased crop yield compared to that of deep tillage system.