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RISS 인기검색어
- 검색키워드
- 저자 : (Ravi Gadagi) (검색결과 27 건)
- 무료
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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.
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(Ravi Gadagi),(Tong Min Sa),(Krishnaraj P. U. ),(Kulkarni J. H. ),(Ki Sup Ahn) 한국환경농학회 2001 한국환경농학회지 Vol.20 No.5
The polymorphism of Azospirillum isolates from ornamental rhizosphere and two reference strains were examined with respect to intrinsic antibiotic resistance (IAR) profile. All the isolates showed different intrinsic resistances to different antibiotics viz., tetracycline, kanamycin, nalidixic acid, streptomycin, ampicillin, spectinomycin and chloramphenicol. All the strains demonstrated susceptibility to high concentration of all antibiotics used in the present experiment. In addition to these general patterns, we also obseved the multiple antibiotic resistances of Azospirillum strains. The Azospirillum sp. OAD-11 was resistant to tetracycline, streptomycin and ampicillin, and Azospirillum sp. OAD-57 was resistant to tetracycline and streptomycin. Conversely, Azospirillum sp. OAD-9 possessed the dual susceptibility to tetracycline and spectinomycin, whereas Azospirillum sp. OAD-37 was dual susceptible to streptomycin and kanamycin. Such multiple antibiotic resistant/susceptible traits could be useful for the identification of the strains in field experiments or in molecular genetic transfer experiments.
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Originals : Performance of MPS Bacterial Inoculation in Two Consecutive Growth of Maize Plants
(Ravi Gadagi),(Olayvanh Singvilay),(Tong Min Sa),(Myung Su Park),(Chung Woo Kim),(Hee Kyung Chung),(Ki Sup Ahn) 한국환경농학회 2001 한국환경농학회지 Vol.20 No.5
Two successive in vitro experiments were carried out to examine the effect of MPS bacterial inoculation on growth, and nitrogen and phosphorus accumulation of maize plants under greenhouse condition in the same soil. There were four treatments, uninoculated control and three phosphate solubilizing bacterial inoculations, viz., Pseudomonas striata, Burkholderia cepacia and Serratia marcescens. The inoculated plants showed the higher plant height, total dry mass, nitrogen and phosphorus accumulation when compared to uninoculated control plants in both experiments. In the combined data analysis from two experiments, the plants inoculated with P. striata and B. cepacia showed significantly higher plant height, total dry mass and P accumulation when compared to S. marcescens inoculated plant and uninoculated control plants. The P. striata and B. cepacia inoculation enhanced total dry matter accumulation by 14% and phosphorus accumulation by 25% over the uninoculated control plants. The nitrogen and phosphorus concentration of maize plants were also increased due to MPS bacterial inoculation, however, the effect was not significant.
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(Ravi Gadagi),(Chang Young Park),(Geon Jae Im),(Dong Chang Lee),(Jong Bae Chung),(Olayvanh Singvilay),(Tong Min Sa) 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.
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