Document Type : main article
Department of Agronomy, Khuzestan Science and Research Branch, Islamic Azad University, Ahvaz, Iran.
Department of Agronomy, Susangerd Branch, Islamic Azad University, Susangerd, Iran.
This research set out to evaluate the effect of combined biological and chemical nitrogen fertilizers on some corn hybrids. To this end an experiment was conducted as split plot on the basis of randomized complete block design with four replications. Main plots were included: use of chemical and biological fertilizers in four levels: 100% chemical fertilizer, 75% chemical fertilizer + 100% bio-fertilizer, 50% chemical fertilizer + 100% bio-fertilizer, 25% chemical fertilizer + 100% bio-fertilizer and sub plots included three corn hybrids: single cross 704 hybrid, Mobin hybrid and Karoun hybrid. Chemical fertilizers used included urea, triple super phosphate and potassium sulphate and Nitroxin for biological fertilizer. Results showed that Karoun hybrid in 50% Chemical fertilizer + 100% biological fertilizer treatment had the highest grain yield, and biological yield and protein percent and the lowest number of grain per row, grain yield, plant height and biological yield belonged to 100% chemical fertilizer and Mobin hybrid treatment. Highest 1000 grain weight belonged to Karoun hybrid and the lowest protein percent was in Mobin hybrid. Finally results revealed that single cross 704 and Karoun hybrids in number of grain per row and protein yield and Mobin hybrid and single cross 704 in 1000-grain weight were not significantly different. Single cross 704 hybrid only in protein percent was higher than other hybrids. Finally consummation of biological fertilizers with 50% organic fertilizer produced the highest grain yield.