Leaching loss of nitrate during the wheat growing season in Piedmont of Mountain Taihang

The leaching loss of N0₃^--N during wheat growing season in Piedmont Mountain Taihang are studied in this paper．The results show that there are lots of N0₃^--N leached during the wheat growing season in Piedmont of Mountain hang for the over fertilization and improper irrigation．The nitrate leaching through 180cm soil depth are 0．1kg／hm²，22．1kg／hm²，and110．1kg／hm² inwheat season with N 100kg／hm²，200kg／hm²，and400kg／hm² treatments，the irrigation before wheat plan ting and the first irrigation in the next year eauses lots of nitrate leached．