Influences of rice and barley straw application in the rice rhizosphere
1988
Lim, S.S. | Kim, K.S. (Chonnam National Univ., Kwangju (Korea R.). Coll. of Agriculture)
This study has been made to investigate the influences of organic matter on the soil composition, nitrogen fixing organism, soil enzyme activity and nitrogen fixing activity in the paddy rice rhizosphere when rice and barley straw were applied. The pH in the submerged soil increased from ear formation stage to harvesting. In the rhizosphere, Fe++ content decreased according to the growing stage, while it increased in the nonrhizosphere. In the initial stage, rhizosphere was higher than nonrhizosphere, but in the late stage nonrhizosphere was higher than rhizosphere on the NH4-N content. In the submerged soil, rhizosphere was higher than nonrhizosphere, on the concentration of glucose and pentose. Changes of the number of nitrogen fixing organism in whole soil was not high. Generally, rhizosphere was higher than nonrhizosphere on the soil enzyme activity such as phosphatase, Beta-glucosidase, and protease. Acetylene-reducing activity was highest in the tillering stage, and rhizosphere, Samgang (high-yielding variety) was higher than nonrhizosphere, Dongjin (general variety) respectively. In the submerged soil applied barley straw, acetylene-reducing activity was slightly higher than rice straw in the initial stage
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