[Dynamic simulation of ammonia- and nitrate N leakage from paddy field under different N supply].
By using self-designed lysimeters, the dynamic changes of ammonia- and nitrate N leakage from the plowpan of paddy field under different N supply were studied, aimed to understand the N leakage loss from paddy field during rice growth period. A dynamic model was built to simulate the N translocation and transformation in rice plant, soil, and water by Vensim software. The data from the field experiment with N fertilization rates of 0, 75, 150, 225, 300, and 375 kg x hm(-2) in Yuhang district, Hangzhou City in 2003 were used for calibrating the model, and the data from the field experiment in 2007 were utilized for validating the model. The simulated N concentrations in the leakage fitted well with the observed data, suggesting that the simulated results were reliable and the model was applicable.
Li
Jin-Wen
JW
College of Life Science, Zhejiang University, Hangzhou 310029, China. coryphium@yahoo.com.cn
Zhong
Sheng
S
Wang
Mi
M
Yang
Jing-Ping
JP
Xu
Wei
W
D000383:Agriculture / Q000379:methods; D005308:Fertilizers; D008962:Models, Theoretical; D009566:Nitrates / Q000032:analysis / Q000378:metabolism*; D009584:Nitrogen / Q000032:analysis* / Q000737:chemistry; D012275:Oryza / Q000254:growth & development*; D000644:Quaternary Ammonium Compounds / Q000032:analysis / Q000378:metabolism*; D012987:Soil / Q000032:analysis*
D005308:Fertilizers; D009566:Nitrates; D000644:Quaternary Ammonium Compounds; D012987:Soil; D009584:Nitrogen