Abstract:A field experiment was conducted to investigate effects of nitrogen fertilizer application rate in paddy field incorporated with straw on nitrogen in surface- and percolating-waters and its losses with the waters. It was designed to have 5 treatments in N fertilizer application rate, i.e. 0, 120, 180, 240 and 300kg/hm2, and all the plots incorporated with 6t/hm2 of straw. Results show that the concentration of inorganic nitrogen (NH4+-N and NO3--N) in the surface- and percolating-waters increased significantly with increasing nitrogen application rate, while the concentrations of NH4+-N and NO3--N were reduced significantly in the surface- and percolating-water by straw incorporation. The concentration of NH4+-N in the surface-water peaked on the next day after each nitrogen application, where the concentration of NO3--N in the surface-water did on the 2ed to 4th day after each fertilization, and the concentration of NH4+-N in leachate did on the 2ed to 4th , of NO3--N on the 20th day after basal fertilization. The average concentration and the variation range of NH4+-N and of NO3--N in the surface water of the 5 treatments was 1.23±0.88(0.01~9.89)and 1.14±0.18(0.14~2.86)mg/L, respectively, and that in the leachate was 1.78±1.60(0.03~22.66)and 1.42±0.24(0.22~2.66)mg/L, respectively. In the paddy field, leakage was in a highly significant negative correlation with the elapse of the time after rice transplanting, and the total leakage was 298 mm during the rice growing stage. The net average loss of NH4+-N and NO3--N with leachate of all the fertilization N treatments was 4.77±4.37 (0.45~12.33) and 1.76±1.08 (0.49~3.31) kg/hm2, accounting for 2.57%~4.11% and 0.41%~0.56% of the N fertilizer applied, respectively. And NH4+-N was the main form of nitrogen leaching loss.
汪军, 王德建, 张刚, 王灿. 秸秆还田条件下氮肥用量对稻田氮素淋失的影响[J]. 中国环境科学, 2010, 30(12): 1650-1657.
WANG Jun, WANG De-Jian, ZHANG Gang, WANG Can. Effects of nitrogen fertilizer application rate on nitrogen leaching in paddy field incorporated with straw. . CHINA ENVIRONMENTAL SCIENCECE, 2010, 30(12): 1650-1657.