Study of the Characteristic of Nitrogen Runoff in Farmland under Different Fertilizing Levels
The quantitative analytical investigation of the characteristic of nitrogen in Chao Lake basin was studied with building runoff ponds in farmland in the natural rainfall condition by collecting the nmoffwater successively.The results of the study for the continuous two years showed that in Chao Lake basin the loss of total nitrogen annual was 7.38-69.59kg/hm2,nitrate nitrogen was 13.74-60.16kg/hm2,ammonium nitrogen was 1.40-4.84kg/hm2,the wastage rote of total nitrogen yearly was 1.68-7.69 %.The study was carried out to reduce the gross of nitrogen and phosphorus on the basis of the high yield fertilizer,compared with the common fertilizer and high yield fertilizer,all the reduction could effectively decrease the runoff loss of nitrogen.Nitrate nitrogen was the main form of the nitrogen,supplemented by ammonium nitrogen.The highest nitrogen loss of all treatments is the common fertilizer.Reduction with straw returning could help to lower the risk of the nitrogen runoff loss in wheat season,but it wasnt very obviously in the rice season.Total nitrogen concentration of the runoff water which generated by rainfall exceeded 2mg/L,the standard of the surface runoff.Considering the yield and environmental effect,the recommend fertilizer ratio of nitrogen in wheat season in Chao Lake basin of Anhui province (base fertilizer-winter fertilizer-jointing fertilizer) is 6-2.5-1.5,the ratio in rice season (base fertilizer-tillers fertilizer-ear fertilizer) is 4-4-2.
wheat-rice rotation nitrogen loss
SUN Li MA Youhua HU Shanbao ZHU Xiaohong WANG Liting WU Manman XU Hongjun
School of Sources and Environment, Anhui Agricultural University, Hefei 230036 Ago-ecological Environment Center of Juchao District, Hefei 238000, China
国际会议
合肥
英文
798-804
2012-05-24（万方平台首次上网日期，不代表论文的发表时间）