Preparation of Spatial Distribution Maps of Soybean Water Requirement in Mazandaran
Soybeans are usually grown in warm weather and water supply is necessary for them. Therefore, preparation of soybeans water requirement maps in Mazandaran province was aimed in the current study. The needed information including the characteristics of climate, crop and the study area was formed in GIS. Reference evapotranspiration was computed by using FAO Penman-Monteith method and climatic data from 51 weather stations. By determining crop coefficient curve in the different growth stages, the 10-day soybean water requirement was obtained. After conducting trend and anisotropy analysis, spatial autocorrelation of the data was determined by calculating experimental semivariograms and fitting semivariogram models. Data were interpolated by using different deterministic and geostatistic methods. Interpolations error were determined based on Root Mean Square Error (RMSE) and Root Mean Square Standardized Error (RMSSE) from cross validation technique. Maps showed that the highest soybean water requirement happened in August which was 4.45-5.26 mm/day. Total soybean water requirement was obtained 511 to 613 that was 511 to 560 mm for the western region, followed by 560 to 580 mm for the eastern coastal, 580 to 595 mm for the eastern central and 595 to 613 mm for the eastern south. Resuts had significant difference compared to studied stations in Reference Book and National Water Document.
Iranian Journal of Irrigation & Drainage, Volume:12 Issue:5, 2018
1059 - 1072
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