Integrated application of chemical, manure and biological fertilizers on growth characteristics of forage corn in Rasht region

To investigate integrated application of chemical, manure and biological fertilizers on growth characteristics of forage corn (SC.704), a field experiment was conducted at Faculty of Agricultural Sciences, University of Guilan, in 2011. The experimental design was carried out as randomized complete block design with ten treatments and three replications. Treatments were included nochemical, biological and manure fertilizers as control, chemical fertilizer (150 kg.ha-1 N and 40 kg.ha 1 P), biofertilizer (Pseudomonas fluorescens+ Azospririllum brasilenes), manure (28 ton.ha 1), 50% chemical fertilizer + biofertilizer, 75% chemical fertilizer + biofertilizer, 50% manure +50% chemical fertilizer, 25% manure + 25% chemical fertilizer+ bioferilizer, 75% manure+ biofertilizer and 50% manure + biofertilizer. Results showed that 100% chemical fertilizer and 50% manure + 50% chemical fertilizer treatments were not significantly different in forage yield, dry matter yield, leaf dry matter, ear dry matter, crop growth rate and leaf area index. Dry matter yield in 100% chemical fertilizer and 50% manure fertilizer + chemical fertilizer treatments were 19253 and 1617 kg.ha-1, respectively. The results of forage quality showed that maximum of protein yield, ash, water soluble carbohydrates, fiber and acid detergent fiber was obtained from 100% chemical fertilizer, 75% chemical fertilizer + biofertilizer, 50% manure +50% chemical fertilizers and 50% chemical fertilizer + biofertilizer. Therefore, using integrated chemical fertilizer, biofertilizer and manure application without significant decline in yield quantity and quality, could be decreased consume chemical fertilizer and its impacts on environment.