The Effects of green and farmyard manure and biofertilizerson nitrogen dynamics in soil, leaves and grains in corn (Zea mays L. cv. Sc704)

In order to evalutate the efficieny of green and farmyard manure and biofertilizers either separated or integrated on nitrogen dynamics in soil، leaves and grains in corn (Zea mays L.)، an experiment was conducted at 2009 cropping season. Experiment was arranged in split split plot based on randomized complete block design with three replicates. Main plots were three levels of green manure (consisting of control، berseem clover and barley) and sub plots were different levels of green manure residuals (including full and half clipping and no-clipping). Different levels of integrated fertilizers (including، 1- control; 2- recommended NPK as 250، 150 and 100 kg urea، superphosphate triple and potassium sulphat ha-1، respectively; 3- 50% NPK 4- 15 Mg farmyard manure (FM) + 50% NPK ha-1; 5- biofertilizer (BF) + 50% NPK; 6- 15 Mg FM + BF ha-1; 7- 15 Mg FM + 50%NPK ha-1 + BF، were the sub sub plots. Results indicated that green manures (both clover and barley) significantly increased soil nitrogen up to 23 percent. Leaves and seed nitrogen however، increased in clover treated plots (15 and 12%، respectively) compared with barley treated plots. Also farmyard manure + 50% NPK، biofertilizer + 50% NPK، and integration of farmyard manure + biofertilizer + 50% NPK، showed the best performance in (up to 32. 9%) terms of nitrogen dynamics compared to recommended NPK.