productivity and economic efficiency of wheat in rotation with cotton

Crop rotation has many benefits for agroecosystems production. in order to evaluate two current rotation systems of wheat (triticum aestivum l.) production in kamalabad region of fasa, an experiment was conducted during 20152016 growing season. the rotation systems were fallowwheat and cotton (gossypium spp.)wheat. research plots were arranged as a randomized complete block design with two blocks. the results showed that seed yield and yield components of wheat were significantly affected by rotation systems. the highest and lowest seed yield and yield components (except 1000 seeds weight and biological yield) and economical value were obtained when wheat was planted after fallow and cotton, respectively. however, the estimation of rotation indices and economic value of rotation systems showed that the highest rotation duration, land use efficiency, production efficiency, and total economic value were obtained from cottonwheat rotation. also, the determination of effective traits in wheat yield showed that plant height, spikes per m2, seeds per spike and harvest index were highly correlated with grain yield. therefore, although planting wheat after fallow produced more seeds, in terms of total ecosystem production and land use efficiency, this system showed lower productivity and economic efficiency compared to cottonwheat rotation. thus cottonwheat rotation could be adopted by farmers for more production.