A TENTATIVE STUDY ON SYNTHETIC EFFECT OF ZERO TILLAGE AND SOIL CONSERVATION ON SLOPING LAND OF YELLOW SPONGY SOIL IN EXPERIMENTAL AREAS OF LUANPING
滦平试区黄绵土坡耕地秋季免耕水保综合效益初探

Autumn zero tillage experiment was carried out in places where soil and water loss is serious but terracing is impossible on the vast expanse of sloping land with yellow spongy soil in eastern section of Yanshan Mountains of Luanping. Results indicated that without practicing autumn tillage, soil scoured was reduced by 79. 3% in comparison to contrast area, surface runoff reduced by 18. 8%, soil moisture increased by about 1%, and soil alkali-soluble nitrogen and quick-acting. phosphorous increased by 1. 4 ppm and 38. 9 ppm respectively, yield increased by 2% to 10% and per hectare cost reduction due to zero tillage by 150-225 yuan. It is really quite promising to popularize zero tillage in the area.