Anthropogenic-alluvial Soil Nitrogen Fertilizer Leaching Loss Characteristics Study Using Soil Column Simulation in Yellow River Irrigation Area, China
Journal of Agricultural Resources and Environment
A soil column simulation experiment was conducted to study the effect of different nitrogen intensity in nitrogen fertilizer leaching loss characteristics in anthropogenic-alluvial soil. There were 5 treatments in this experiment, no nitrogen fertilizer treatment (N0), conventional fertilization treatment (N300), optimized fertilization treatment (N240), double conventional fertilization treatment (N600) and double optimized fertilization treatment (N480). The results showed that with different
... that with different nitrogen intensity treatments, nitrate nitrogen concentration increased firstly and then decreased and leaching concentration peak appeared delay with nitrogen rates increasing. Nitrate nitrogen was the predominant nitrogen leaching form, increase of nitrogen application could postpone nitrogen peak appear time and lead to leaching risk. Ammonium nitrogen leaching loss occurred in the earlier period. Total N leaching losses were 94.53, 128.02, 222.06 kg·hm-2 and 268.6 kg·hm-2 in treatments N240, N300, N480 and N600, which accounted for nitrogen leaching losses rates by 39.38%, 42.67%, 46.26% and 44.77%, respectively. Applied nitrogen fertilizer was very easily leaching to 100 cm soil depth, indicating that nitrogen fertilizer leaching could be a pollution source for underground water. About 39.38%~46.26% of fertilizer nitrogen applied in soil was lost by leaching. The accumulative total N leaching amount was in accordance with logarithmic equation of Yt=a+blnt.