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Abstract Botany and Microbiology Department, Faculty of Science, Sohag University Different eight microbiological treatments were used for compost inoculation with the previous microorganisms. . The study involved three main parts; firstly: microbiological surveys (fungi and bacteria) of sorghum wastes, farmyard, chicken manures and composted heaps during composting process, secondly: study of physical and chemical changes in different composted heaps to select the best effective composts and thirdly: study the effect of produced effective composts application on wheat plant (Giza 168) growth as plant test and soil productivity in addition to soil properties to select the best effective compost. According to Microbiological survey and chemical analysis of nitrogen, phosphorus, potassium, organic carbon, organic matter and carbon/nitrogen ratio in different composted heaps, the composted heaps of treatments C, D, E and F were selected to be used in field experiment and research progress. Data showed that wheat plant (Giza 168 as plant test) height, spike length, spike weight, grains number in spike, protein content and yield significantly increased as a result of the combined application of organic Abstract XVI composts tested with half dose of mineral-N. Also, data showed significant increases in total nitrogen by using organic compost C combined with half dose of mineral-N compared to using of full recommended dose of mineral-N. The highest values of N, P and K were recorded when mixture of organic compost C combined with half dose of mineral-N was tested that produced 2.70%, 0.69% & 0.45% in grain and 2.1%, 0.42% & 1.4% in straw, respectively. In general wheat plants (Giza 168) treated with organic compost C inoculated with mixed microorganisms (A. niger, Trichoderma hamatum, sterile mycelia, Mucor racemosus and Bacillus sp.) combined with half dose of mineral-N showed highly significant increases in plant height, fresh and dry weights, and NPK uptake compared to those treated with mineral-N only. From this study and all the previous tests, data revealed clearly that mixture of compost C + urea 50% were the best effective compost tested and can be used in cultivation of cultivated soils and reclaimation of newly soils to increase their fertility and become rich soils. |