Effects of Rice Straw and Gypsum on the Changes of Urease, Nitrate Reductase and Nitrite Reductase Activities in Saline Paddy Soil

간척답토양(干拓沓土壤)에 볏짚 및 석고시용(石膏施用)이 뇨효소(尿酵素), 초산환원효소(硝酸還元酵素) 및 아초산환원효소(亞硝酸還元酵素)의 활성(活性)에 미치는 영향(影響)

  • Published : 1985.06.25

Abstract

A incubation study was conducted to find out the effects of rice straw and gypsum as soil ameriolite on urease, nitrate and nitrite reductase activities in newly reclaimed saline sandy soil. The results obtained were summarized as follows: 1. Very low urease activities were observed in saline soil if contrast to high productive paddy soil. Urease activities were lower at 5 days than that of 25 and 50 days after incubation. Remarkably high urease activities were obtained by the application of rice straw and gypsum. 2. Comparing with NPK treatment, application of rice straw and gypsum were enhanced the activities of nitrate and nitraite reductase. 3. Positive correlation (r=0.5501 p=0.05) was obtained between urease activities and ammonium nitrogen concentration in soil. 4. Cyclic oxidation and reduction of nitrate and nitrite in soil were obtained in terms of first order microbial kinetics reaction in case of application of rice straw and gypsum, respectively. 5. Positive correlation (r=0.6296 p=0.05) was obtained between the activitie of nitrite reductase and nitrate reductase in soil.

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