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Enzyme and Microbial Activities in Paddy Soil Amended Continuously with Different Fertilizer Systems
Gadagi, Ravi,Park, Chang-Young,Im, Geon-Jae,Lee, Dong-Chang,Chung, Jong-Bae,Singvilay, Olayvanh,Sa, Tong-Min 한국환경농학회 2001 한국환경농학회지 Vol.20 No.5
Soil enzyme and microbial activities are affected by fertilizer and compost applications and can be used as sensitive indicators of ecological stability. Microbial population and soil enzymes viz., dehydrogenase, urease, acid phosphatase and arylsulphatase were determined in the long-term fertilizer and compost applied paddy soil. Soil samples were collected from the four treatments (control, compost, NPK and compost+NPK). Long-term NPK+compost application significantly increased activities of urease, dehydrogenase and acid phosphatase than all other treatments. The compost application enhanced activities of urease, dehydrogenase and acid phosphatase than the NPK application. However, arylsulfatase activity was not significantly different between compost and fertilizer application. The highest microbial population was recorded in the NPK+compost treatment. The compost application also resulted in higher microbial population than the NPK application. The above results indicate that ecological stability could be maintained by application of compost alone or with NPK.
MPS-Bioinoculant Responses to Augment Soil Fertility and Crop Production
Gadagi, Ravi S.,Park, Myung-Su,Chung, Hee-Kyung,Kim, Chung-Woo,Chung, Jong-Bae,Sa, Tong-Min 대구대학교 생명과학연구소 2003 생명과학연구 Vol.1 No.3
Phosphate solubilizing bioinoculants are known to solubilized the insoluble organic and inorganic phosphates into soluble inorganic phosphates, which readily taken up by the plants. The major mechanisms of organic and inorganic phosphate solubilization are the production of organic acids and acid phosphatases, respectively. Inoculation of Phospho-bioinoculants to crop plants increased the P uptake and crop yield. Pesudomonas striata inoculation increased the growth, yield and P uptake of sunflower plants in neutral soil. The inoculation of phosphate solubilizing bacteria increased the growth and P uptake of maize plants in two consecutive studies in acidic soil.