RESPONSE OF SOYBEAN (GlycinemaxL. Merrill) PRODUCTIVITY TO BIOFERTILIZER INOCULANTS COMBINED WITH ORGANIC FERTILIZERUNDER SANDY SOIL CONDITIONS

One of the most important food sources for humans is the soybean crop because it is an important source ofprotein and oil, which makes it important to improve its productivity under stress conditions, especially in sandy lands.Therefore, the study aimed to improve soybean productivity by using biological fertilizers in the presence of organicfertilizer and low concentration of mineral fertilizer under new sandy soil conditions.The experiment was carried out intwo summer seasons of 2020 and 2021 at the Ismailia Research Station, Ismailia Governorate. The used inoculates inthe experiment were,an identified Streptomyces strain,Bacillus megatherium, (SEWRI) and Bradyrhizobiumjaponicum(Okaden) as,biofertilizer agents.Activated dose of N-fertilizer was used in seven different treatments. Results showedthat Bradyrhizobia+Bacillus+actinomycetes+20 kg nitrogen fertilizer/fed was effective in the presence of organicfertilizer compared to organic fertilizer-free soil or un-inoculated+70 kg N/fed. Bradyrhizobia+ Bacillus+Actino+20 kgN/fed (T14) was the most effective treatment in the presence of organic fertilizer compared to organic fertilizer-free soilor uninoc.+70 kg N/fed. Promising expected yields of each of seeds and straw (Ton/fed) of soybean plants cultivatedunder different fertilizers and biofertilizers conditions expected was clear from increasing the yield seed up to1.8400Ton/fed in the presence of organic fertilizer (T14) compared to 1.4565 when soybean was cultivated in theabsence of organic fertilizer (T01). This could be supported by the amounts of NPK, N-percentage, and protein content,numbers of branches and pods and dehydrogenase activity in soil. Significant differences between the straw yield in thepresence and absences of organic fertilizer as well as biofertilizers were recorded. Organic fertilizer applicationrecorded the highest significant increases in nodulation status, growth and straw nitrogen content as well as harvestparameter of soybean compared with those un-received organic fertilizer