Effects of Nitrogen and Phosphorus chemical and biological fertilizers on yield and yield components of sweet corn (Zea mays var saccharata)

In order to effect of application chemical fertilizers (nitrogen and phosphorus), Nitroxin biofertilizer (containing Azospirillum, Azetobacter and phosphate solubilizing bacteria from Pseudomonas genus) and Phosphate Barvar 2 (containing 2 strains of bacteria, 5 p and bacteria 13p) in Pashen sweet corn variety, an experiment was conducted as factorial base on randomized complete block design with three replications in Gachsaran Agriculture Research Center Farm, in 2010- 11. Experimental treatments were contained of 50, 100 and 150 kg/ha of nitrogen, without the use of biological fertilizers and using 1 liter ha-1 Nitroxin as the first factors and 75 and 150 kg ha-1 triple super phosphate, without application of biofertilizers and the application of 100 g ha-1 phosphate Barvar2 with 75 kg ha-1 phosphorus and without application chemical fertilizer as the second factors. Traits were included yield components (cob number per plant, number of rows per cob, grain number per row, number of grains per cob and thousand grain weight), fresh cob yield, biological yield and grain yield of canned, sweet corn cob harvest index and grains. Finally, application of 150 kg nitrogen and 75 kg ha-1 phosphorus with application phosphate Barvar 2 and Nitroxin biofertilizer had the greatest increase in yield and yield components, grain protein and phosphorus content. In grain harvest index, 150 kg ha-1 nitrogen with Nitroxin biofertilizer and 100 g/ha of phosphate barvar2 application have had the most influence.