Paper Information

Journal:   PLANT ECOPHYSIOLOGY (ARSANJAN BRANCH)   spring 2018 , Volume 10 , Number 32 #l00572; Page(s) 130 To 141.

Determining the optimum sowing date of chickpea in Kermanshah province using modeling approach

Author(s):  AMIRI S.R.*
* Department of Plant Production, Faculty of Agriculture, Higher Educational Complex of Saravan, Saravan, Iran
Crop simulation models are useful tools for determination of optimum strategies for crop management and sustainability of the agricultural ecosystems. The aim of this study was to evaluate the effect of different sowing dates on grain yield, biological yield and water use efficiency of chickpea (Bivanij cultivar) under rainfed conditions at five locations in Kermanshah province. For this purpose, the SSMChickpea model with historical daily weather data for the period of 1985– 2014, were used. The results showed that early sowing date increased leaf area and biological yield and eliminated terminal drought stress. The highest and lowest grain yield was obtained on 20 February and 4 March sowing dates with 1269 and 446 kg ha-1, respectively. The delayed sowing date substantially reduced grain yield by 64%. Furthermore, the highest and lowest biological yield was obtained on 20 February (3448 kg ha-1) and 21April (2217 kg ha-1). On the other hand, the greatest water use efficiency was obtained on 20 February (6. 6 kg ha-1 mm-1). Therefore, in Kermanshah province with a cold semi-arid and arid climate, the farmers with early sowing (20 February) could improve water use efficiency, biological yield and average productivity of rainfed chickpea because earlier sowing dates resulted in the longer growing season, more concurrency rainfall with growing season. It also concluded that early-sowing crops flowered and matured earlier and escaped later drought.
Keyword(s): Biological yield,grain yield,drought stress,SSM-chickpea model,water use efficiency
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