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Model estimation of ammonia volatilization from a paddy rice field after application of a surface film-forming material

Published online by Cambridge University Press:  09 October 2009

S. Y. ZHUANG  and
M. K. WANG
S. Y. ZHUANG
Affiliation:
State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing210008, P. R. China
M. K. WANG*
Affiliation:
Department of Agricultural Chemistry, National Taiwan University, 10617Taiwan
*
*To whom all correspondence should be addressed: Email: mkwang@ntu.edu.tw
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Summary

The efficiency of nitrogen fertilizer use is as low as 0·30–0·35 in most agricultural practices due to losses to the natural environment in many ways. Ammonia (NH3) volatilization is important in paddy rice fields. The present study investigated the effect of a surface film-forming material (SFFM) on NH3 volatilization from a paddy rice field, by model estimation using parameters from evaporative pan experiments. The modified Jayaweera–Mikkelsen (J-M) ammonia volatilization model was employed to simulate and elucidate the effect of SFFM in reducing ammonia volatilization from paddy fields. A parameter of kf value in the J–M modified model was introduced to represent the resistance of NH3 volatilization loss from SFFM. The simulated data fitted well with the prediction of the J–M modified model and field observations. The modified J–M model is suitable for screening and verifying the new SFFM, and merits further study.

Type
Crops and Soils
Information
The Journal of Agricultural Science , Volume 148 , Issue 1 , February 2010 , pp. 95 - 100
Copyright
Copyright © Cambridge University Press 2009

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References

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