Effect of organic fertilizers on the yield and yield components of spring wheatunder drought stress

The present study aimed to evaluate the effect of organic fertilizers on growth and yield of spring wheat under deficit irrigation conditions in the Agricultural Research Station located in the city Pakdasht Aboureyhan Tehran University in Tehran during the crop year was 90-1389. To test the split plot design in randomized complete block design with three replications. Main stress irrigation, in three levels (no irrigation at flowering stage (a1), grain filling (a2) and normal irrigation area (a3)) and the operating subsidiary in four levels (15 tons of compost fungus 15 tons of manure (b1) 60 kg of nitrogen fertilizer net 15 tons of manure (b2), 60 kg of nitrogen fertilizer net 15 tons of compost fungus (b3) and 120 kg of pure nitrogen (b4) respectively. In this experiment, the treated water irrigation on the weight of biological function seed, grain number per spike, number of spikelets per spike, harvest index, seed weight and number of fertile spikelets per spike had a significant effect. fertilizer treatments on weight and biological yield, grain number per spike, number of spikelets per spike, harvest index, number of spikes per square meter, grain weight and number of fertile spikelets per spike had a significant effect. use of organic fertilizers in terms of environmental stress, especially drought stress causes stress effects can be reduced and plant show better performance. Organic fertilizers improve soil properties, especially soil moisture holding capacity to create aggregate, helps increase the amount of moisture available to plants. use a combination of organic and chemical fertilizers can be negative effects of fertilizers reduce chemical.