The runoff plot experiment and nitrification experiment was made to study nitrogen loss and sapplying capacity on slopping farmland in loess hilly region.

• 在黄土丘陵区坡耕地黄绵土上进行径流小区试验,研究侵蚀条件下土壤氮素流失规律,并采用硝化力培养方法研究黄绵土的供氮能力。