تاثیرزمان به خاک دادن گیاهان مختلف کود سبز بر محتوای نیتروژن خاک و رشد اولیه گندم

In order to study the effect of time incorporation to the soil of different green manure crops on soil nitrogen contents and the primary growth of wheat a field experiment was carried out in experimental farm of Agricultural Faculty of ShahidChamran University of Ahvaz at 2013-2014 growing season. Experimental design was randomized complete block as a split-plot with three replications. The main plots consisted of three time incorporation to the soil of green manures includes 40,50 and 60 days after planting and sub-plots including of different green manure crops including Sorghum, Barley, mungbean, Intercropping of barley and mung bean and fallow (without green manure application).This experiment carried out at two steps. The first step was sowing of different green manure plants and the second one was the sowing of subsequent plant (wheat).The results showed that the highest soil nitrogen contents in all of three green manure incorporation time was related to mungbean green manure and mungbean and barley intercropping treatments. The highest effect of green manure treatments on wheat leaf area index and dry matter in all of three incorporation time were obtained at mungbean green manure and intercropping of mungbean and barley respectively.