Journal of Agronomy1812-53791812-5417Asian Network for Scientific Information10.3923/ja.2012.53.59ArifChusnulSetiawanBudi IndraMizoguchiMasaruDoiRyoichi22012112Water saving technologies such as non-flooded irrigation have
been introduced in many rice production during the past decade. Water balance
analysis is needed to quantify water supply, loss and consumption for maximization
rice production under such irrigation. However, hydrological data are often
limited because acquisition of measurements in the field is costly, complicated
and time consuming, hence methods that can estimate water balance components
based on the combined use of available measurement data and an appropriate model
are required. This study presents the estimation method using excel solver to
estimate non-measurable water balance components, i.e., irrigation water, crop
evapotranspiration, percolation and runoff, in a paddy field under non-flooded
irrigation. The method was examined in two cultivation periods under different
weather conditions. The model validation, indicated by coefficient of determination
(R^{2}) values, was greater than 0.86 (p<0.01) between observed and
calculated values of soil moisture. Furthermore, when relationships among precipitation
and estimated runoff was compared, the reliability of the model was shown by
the significant linear correlations with correlation coefficient (R^{2})
higher than 0.98 (p<0.01). These results indicate the reliability and applicability
of the proposed method for estimating non-measurable water balance components
for rice production when only limited data of measurable components are available.]]>Abdel-Fattah, Y.R., H.A. El-Enshasy, N.A. Soliman and H. El-Gendi,2009Abu-Saleem, A., Y. Al-Zubi, O. Rimawi, J. Al-Zubi and N. Alouran,2010Allen, R.G., L.S. Pareira, D. Raes and M. Smith,1998Angus, J.F.,1991Berekaa, M.M., Y.R. Abdel-Fattah and H.M. Hussein,2006Gordonia polyisoprenivorans VH2 using response surface methodology.]]>Bouman, B.A.M., E. Humphreys, T.P. Tuong and R. Barker,2007Bouman, B.A.M., S. Peng, A.R. Castaneda and R.M. Visperas,2005Bouman, B.A.M. and T.P. Toung,2001Chen, R.S., L.C. Pi and Y.H. Huang,2003Cho, J.Y.,2003Comuzzi, C., P. Polese, A. Melchior, R. Portanova and M. Tolazzi,2003Dasgupta, P.K.,2008El-Shehawy, S.A.,2008Ghandhari, A. and S.M.R.A. Moghaddam,2011Guerra, L.C., S.I. Bhuiyan, T.P Tuong and R. Barker,1998Kalita, P.K., R.S. Kanwar and M.A. Rahman,1992Lin, X.Q., D.F. Zhu and X.J. Lin,2011Luo, Y.F., S. Khan, Y.L. Cui and S.Z. Peng,2009Machuca-Herrera, J.O.,1997Maleki, N., B. Haghighi and A. Safavi,1999Mohan S. and N. Arumugam,1994Najafi, P.,2007Persaud, N., X. Zhou and D. Lesolle,2007Sato, S., E. Yamaji and T. Kuroda,2011Tyagi, N.K., D.K. Sharma and S.K. Luthra,2000Van Genuchten, M.T.,1980Vijayakumar, M., S. Ramesh, N.K. Prabhakaran, P. Subbian and B. Chandrasekaran,2006Vu, S.H., H. Watanabe and K. Takagi,2005Walsh, S. and D. Diamond,1995Yang, X., B.A.M. Bouman, W. Huaqi, W. Zhimin, Z. Junfang and C. Bin,2005Zhao, L., L. Wu, M. Wu and Y. Li,2011