Improvement of Maize Yield and Some Soil Properties by Using Nitrogen Mineral and PGPR Group Fertilization in NewJv Cultivated Saline Soils

摘要

A FIELD EXPERIMENT was carried out on the summer growing season of 2006 at Sahl El-Tina plane. This work aimed to study the possibility of improvement the new cultivated soils at Galbana village of Sahl El-Tina plane with area reach about area 40000 fedans. This area is irrigated from El-Salam canal (Nile water -agriculture drainage water), and decrease mineral nitrogen fertilizer by using bio-fertilization, reduce the environments pollution. Maize grains (cv. Triple hybrid 310) were inoculated by Azospirillum barasilense strain (salt tolerant PGPR strain) in the half of plots with N_2- fixer bacteria through coating the grains with bacterial carrier material. On the other hand half plots were left without inoculation. Mineral nitrogen fertilizer was applied on three equal doses at the rate of 100, 150 or 200 urea 46% N kg/fed, in sub treatments in a split plot design. The-results showed Jthat pronounced decreases in pH and EC values, were occurred due to some improving in soil properties. Availability of N, P and K in the soil were increased as compared to the initial.soil and consequently increased in the grains and stover of maize. Yields of grains and stover as well as weight of 100 grains gave high significant yield in the presence of 92 kg N/fed combined with inoculation treatment. It could! be noticed also that the inoculation with PGPR group accompanied with mineral nitrogen levels up to 60 to 70 % of the recommended doses of mineral nitrogen raised their efficiencies .Finally, it could be concluded that N_2-fixer strains in combination with 150 kg urea/fed gave the highest maize yield arid showed the effective role of PGOR under saline condition.