Evaluation Combined Effect of Sulo Potash and Zinc Chelate on Corn Crop Production under Water Deficit Stress Conditions in Southwest of Iran (Shoushtar Region)

BACKGROUND: Management of balanced fertilizer application according to plant growth requirements and soil testing is one of the strategies for improving the quality and quantity of agricultural products. OBJECTIVES: This study was done to assess effect of different level of macro elements and Microelements on Corn crop production affected drought stress. METHODS: This research was conducted via analysis split plot experiment based on randomized complete blocks design during 2018 with three replications. The main factor included water deficit stress (60 mm, 90 mm and 120 mm evaporation from the Class A evaporation pan). The sub factor consisted different type of fertilizer (Control, 10 kg.ha -1 Solu Potash, Combined Solu Potash and Chelated Zinc, 0.004 L.ha -1 Chelated Zinc). RESULT: According result of analysis of variance effect of water deficit stress and fertilizer on all measured traits was significant, but interaction effect of treatments on number of grain per row, 1000-grain weight and chlorophyll index was not significant. Mean comparison result of different level of water deficit stress indicated that maximum number of grain per row (35.08), 1000-grain weight (180.50 gr) and Chlorophyll index (48.08) was noted for 60 mm evaporation from the class A evaporation pan and minimum of those traits belonged to 120 mm. As for Duncan classification made with respect to different level of fertilizer maximum and minimum amount of number of grain per row (36.57), 1000-grain weight (179.28 gr) and Chlorophyll index (48.08) belonged to Combined use of Solu Potash and Chelated Zinc (49.13) and control treatment. CONCLUSION: Generally according result of current study combined use of Solu Potash and Chelated Zinc fertilizer with irrigation at 60 mm evaporation from the class A evaporation pan had the highest amount of crop production, so it can be advice to farmers.