Biochemical Response of Different Hybrids of Corn to Consumption of Biological and Chemical Potassium Fertilize and Drought Stress in Dehloran climatic

This study was carried out to evatuate the effects of combined application of chemical and biological Potassium fertilizer, on biochemical characteristics and grain yield of corn hybrids under drought stress conditions in 2015 and 2016 years in Dehloran city. The experiment was conducted as split-split plots in a randomized completely block design (RCBD) with three replications. The main factor consists of three levels of stress,optimum irrigation, irrigation cut in 12 leaf stage and irrigation cut at the corn flower emergence stage, Sub-factor contains of three levels of potassium: application of 100% fertilizer requirements as Potassium sulfate fertilizer, application of 70% Potassium sulfate fertilizer along with 30% Pta-Barvar-2 bio-fertilizer, 50% Potassium sulfate fertilizer along with 50% Pta-Barvar-2 bio-fertilizer and sub-sub- factor contains of three corn hybrids: AS71, NS640 and CORDONA. The results of compound analysis showed that the interaction between year, drought stress, fertilizer and hybrid were significant on chlorophyll content, proline and grain protein at 1% probability level. Also, the interaction of drought stress, fertilizer, hybrid had significant effects on the enzyme superoxide dismutase, potassium grain and grain yield. Also, Application of biological and chemical potassium fertilizers under drought stress had a positive effect on biochemical characteristics and grain yield. Based on the interaction between treatments, the highest grain yield (12230 kg.ha-1) was found in 50% potassium fertilizer + 50% fertilizer Peta Fertilizer in hybrid AS71 under favorable irrigation conditions and the lowest grain yield (4616 kg.ha-1) obtained by NS640 hybrid and 100% chemical fertilizer application and by the irrigation cut at the corn flower emergence stage.