Hager I. Tolba, El-Sayeda H. M. El-Badawy and Hanaa A. Abo-Kora( 2013). Response Of Potato Crop Inoculated With Silicate Bacteria And Cyanobacteria Under Two Levels Of Potassium Sulphate And Feldspare.N. Egypt. J. Microbiol. Vol. 36, September
Abstract: A field experiment was carried out at El-Nubariea Research Station, El-Bohera Governorate, Egypt, during winter season (2012/2013) to study impact of Bacillus circulans (silicate bacteria) and cyanobacteria under two sources (potassium sulphate and feldspare) and two levels (½ full dose of K and full dose of K )of recommended potassium fertilizers on plant growth parameters, yeild and crop component (minerals content, total carbohydrates % and soluble sugar content %) and the soil biological activity (dehydrogenase activity, nitrogenase activity and total bacteria). Results indicated that microbial inoculation caused significant increase in shoots dry weight after 60 and 90 days of planting compared with non inoculation treatments. Feldspar increased the plant growth and yields more than potassium sulphate. Moreover a slight increase in nitrogen content of plants after cyanobacteria inoculation was observed. Furthermore, phosphorus and potassium percentage were slightly increased after inoculation with B. circulans compared with non inoculation treatments. Results revealed that, high total carbohydrates (%) were estimated with (full dose of feldspar and B. circulans, however, the highest soluble sugar content was determined with (full dose of feldspar and cyanobacteria). Data also revealed that dehydrogenase and nitrogenase activities were significantly increased after microbial inoculation and also feldspar caused significant increase more than potassium sulphate in combination with microbial inoculation. Moreover, B. circulans caused significant increase more than cyanobacteria. The total microbial count showed the same trend. So, the use of feldspar (K-rock) in combination with biofertilizers may be agronomically more useful and environmentally more feasible than chemical potassium ferlizer.
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