Also, the available content of N, P and K were significantly increased, while, the available of Fe, Mn and Zn were non-significant in comparison with untreated seeds.Therefore, the different cultivars of soybean inoculation with Rhizobium radiobacter (PGPR) not only decrease nitrogen fertilizer application, but also improves soybean yield and yield components. We concluded that Rhizobium radiobacter (PGPR) could be an eco-friendly alternative for reducing soil pollution caused by fertilizers usage and reduce the impact of soil salinity.
Two field expereriments were carried out on sandy soil at a private farm, at El-Shaarawey Village, El Bustan Region, El Behira Governorate located at lat. 30° 43' 22.01"N, long. 30° 13' 44.50" E. during two consecutive seasons at 2012/2013 and 2013/2014.The study was to assess the influence of appling K as soil addition alone or in combination with K foliar application and foliar applied humic substances (HS) at two rates (1 and 2 g/L) in absence or presence of foliar applied molybdenum (6 ppm) on the yield productivity of faba bean plants (C.V Nubaria 1). The results could be summarized in the following points:Data inferred that molybdenum had a significant promotive effect on weight of pods/plant, 100-seed weight, straw, pod and seed yields. Also, the data indicated that content of N%, K% and their uptake , as well as protein% were significantly increased due to foliar application of molybdenum .Soil application of the half recommended rate(HR) of K with foliar spray of HS (1 or 2 g/L) or 1% potassium sulphate, irrespective of molybdenum treatments, gave the most positive effect on yield, its components, and uptake of N,P and K in seeds compared to sole application of full or half recommended rate with no significant differences in most cases.The highest pod or seed yield as well as weight of pods/plant were achieved by application of 50%-K along with foliar HS (1g/L) while, the highest 100-seed and straw yield were recorded by using HS (2g/L). The interaction effect on the studied characters notably appeared in the triple treatment of K-50% as soil addition with foliar application of humic substances at rate (1g/L) and molybdenum (6 ppm) which was superior to others and achieved the significant effect on 100-seed weight, straw yield, N%, P% ,K% and protein %, as well as N, P and K uptake.
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