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Paper Information

Journal:   IRAN AGRICULTURAL RESEARCH   2003 , Volume 22 , Number 1; Page(s) 89 To 104.
 
Paper: 

EFFECTS OF RAINFALL DISTRIBUTION ON THE DRYLAND WHEAT YIELD WITH AN ECONOMIC ANALYSIS IN SOUTHERN PROVINCES OF I.R. IRAN

 
 
Author(s):  , HONAR T., REZAEI A.R.
 
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Abstract: 
Annual rainfall and distribution of rain are the major uncontrolled inputs in dryland farming and possibly the main cause of yield fluctuation. Therefore, it is necessary to understand their relationships to the yield of major dryland crops. Furthermore, agroclimatological parameters along with economic analysis can determine the area suitable for dryland farming. The objectives of this study were to seek relationships between seasonal or monthly rainfall distributions and wheat, barley and lentil yields in the southern provinces of I.R. Iran. Monthly rainfall indices excluding January and February were included in multiple regressions for prediction of wheat. barley and lentil yields for the Mamasani, Kazeroon and Sepidan areas. For the Badjgah and Gachsaran areas the regression equations with the seasonal rainfall indices are presented. For the Badjgah area, due to cold winters its indices were excluded while for Gachsaran area (a warm area with shorter growing season) the rainfall indices for all seasons were included in the regression equations. Regions with mean annual rainfall of 300 mm are appropriate for economic wheat dry land farming with 50% probability, ,while areas with mean annual rainfall of 360 mm are appropriate for economic wheat dry land farming with 80% probability. Map of suitable areas for economic dryland farming of wheat with different probabilities are presented.
 
Keyword(s):  DRYLAND FARMING, ECONOMIC ANALYSIS, REGIONAL CLASSIFICATION.
 
References: 
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