Growth and yield of onion as affected by biofertilization, application of nitrogen and phosphorus fertilizers under South Valley conditions.

摘要

An experiment was conducted at the experimental farm of Sohag South Valley University, Egypt, during 2001/02 and 2002/03 winter seasons to investigate the efficiency of the rhizobacterin and vesicular arbuscular mycorrhizas (VAM) as biofertilizers and an effective alternative for the nitrogen and phosphorus chemical fertilizers in onion production. The obtained data indicated that inoculation of onion transplants with the rhizobacterin separately or combined with VAM in the presence or absence of different doses of nitrogen and phosphorus chemical fertilizers significantly increased the most studied characters as compared with the uninoculated transplants in both seasons. However, the inoculation of onion transplants with dual inocula of rhizobacterin plus VAM combined with (22.5 kg N/fed.+7.5 kg P2O5/fed.) gave the best results of the most studied characters, i.e. plant height (cm), number of leaves, bulbing ratio, total bulb yield (t/fed.), marketable yield (t/fed.), cull yield (t/fed.), total soluble solid, nitrogen, phosphorus and potassium percentages in both seasons. Therefore, the use of dual inocula as biofertilizers may replace the application of 75% of the recommended dose of nitrogen and phosphorus chemical fertilizers..