[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.
College of Life Science, Zhejiang University, Hangzhou 310029, China. coryphium@yahoo.com.cn
Jin-Wen
JW
Li
Sheng
S
Zhong
Mi
M
Wang
Jing-Ping
JP
Yang
Wei
W
Xu
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