No abstract

A pot experiment was carried out at the Agricultural Research Station of Sakha, during the summer season of 2011 to study effect of bio and mineral nitrogen fertilizer on productivity of some tomato varieties under drip fertigation system. Split split plot design with four replicates was performed. The main plots were assigned by 2 tomato var. of Alesa and Super streen B, The sub plots were occupied with 2 biofertilizer treatments 1-unfertilized 2-fertilized with biofertilizer (bio fertilizer is compost tea enriched with Bacillus megatheriem, Azotobacter and Azosperlium). Finally, the sub-sub plots were occupied with 4 N fertigation levels (Without N fertigation dose, 50%, 75% and 100% of the recommended N fertigation dose). Data revealed that the highest mean values of fresh and dry weights of whole plant (g pot-1) were obtained from 100% of the recommended N fertigation dose with biofertilizer under Alesa var. Meanwhile, the lowest values of fresh and dry weights of whole plant (g pot-1) were obtained from the control without biofertilizer under Super streen B var. The highest mean values of fruits as fresh and dry weights (g pot-1) were obtained from 100% of the recommended N fertigation dose with biofertilizer under Alesa var. Meanwhile, the lowest mean values of fruits as fresh and dry weights (g pot-1) were obtained from the control without biofertilizer under Super streen B var. The highest values of N and P concentration (%) in shoots were obtained from 100% of recommended N fertigation dose with biofertilizer under Alesa var, while the highest (K%) value was obtained from 100% of the recommended N fertigation dose with biofertilizer under Super streen B var compared with the control. The highest value of N concentration (%) in fruits was obtained from 100%of the recommended N fertigation dose with biofertilizer under Alesa var. compared with the control. The highest values of (P and K%) in fruits were obtained from100% of the recommended N fertigation dose with biofertilizer under Super streen B var compared with the control (without biofertilizer under Super streen B var.).