Paper Information

Journal:   IRANIAN JOURNAL OF SOIL AND WATERS SCIENCES   2003 , Volume 17 , Number 1; Page(s) 112 To 112.
 
Paper: 

THE EFFECTS OF RAINFALL AND TEMPERATURE ON THE YIELD OF DRYLAND WHEAT IN KERMANSHAH PROVINCE

 
 
Author(s):  TALLIEE A.A., BAHRAMY N.
 
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Abstract: 
The effects of rainfall and temperature on the yield of dryland wheat were evaluated. The main objective was to develop a model that could predict dryland wheat yield before harvest by using the yield at fanner"s field and climatic data (temperature and rainfall) during the past 13 years. The following equation was developed: Y= 95+ 7.6 M.R+ 5.2 S,T.W,>4 °c +5.2 A.R- (4.6 FSP+25 mm), in which: Y = Yield (kg/ha), M.R = May Rainfall (mm), S.T.W>4 °c = Sum of Temperature>4 °c in winter, A.R = April Rainfall (mm), and FSP+25 mm = First Significant Precipitation + next 25 mm rainfall. From above equation it is concluded that rainfall has stronger effect on the yield than temperature. The increase in rainfall at the end of growing period is more effective than at the beginning of growing period. S.T.W. has a positive effect on yield, while temperature increase at the end of growing period has a negative effect on yield.
 
Keyword(s): WHEAT, DRYLAND FARMING, KERMANSHAH
 
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