Effect of some bio and mineral fertilization levels on the growth, productivity and storability of onion
2009
aHMED, m.e.m.
Two field experiments were carried out at the Experimental Farm of the Faculty of Agriculture, Tanta University, Egypt, during the winter seasons of 2006/2007 and 2007/2008 to study the effect of some bio-fertilizers such as rhizobacterin, nitrobein, biogein, phosphorein, microbein combined with different levels of NPK mineral fertilizers on growth, yield, and yield quality and storability of onion bulbs. The obtained results indicated that, applying the rhizobacterin plus phosphorein, nitrobein plus phosphorein and biogein plus phosphorein combined with 75 % of the recommended dose of mineral fertilizers significantly increased plant height, dry weight per plant, bulb weight, total bulb yield and N content of leaves and bulbs. Also, the previous gave the lowest values of bulb weight loss percentage during the storage periods, i.e. 2, 4, 6 and 8 months, in both seasons. There were no significant differences between these treatments and the complete recommended dose of NPK mineral fertilizers in this concern. Biofertilization treatments resulted in the lowest values of nitrate in both leaves and bulbs in the two growing seasons. Applying rhizobacterin plus phosphorein, nitrobein plus phosphorein and biogein plus phosphorein combined with 75 % of the recommended dose of mineral fertilizers were recommended for onion production without reducing productivity. Other benefits of these treatments include reduction the cost of chemical fertilizers, avoiding the risk of nitrate accumulation in the edible portions and the pollution of the environment.
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