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답전윤환에 따른 토착 Bradyrhizobium japonicum의 서식밀도와 토양 이화학성과의 관계
강위금,박창영,윤문태,최상욱,하호성 ( Ui Gum Kang,Chang Young Park,Moon Tae Youn,Sang Uk Choi,Ho Sung Ha ) 한국응용생명화학회 1997 Applied Biological Chemistry (Appl Biol Chem) Vol.40 No.5
The relatedness of naturalized Bradyrhizobium japonicum populations with soil physicochemical characteristics as affected by paddy rice-upland soybean rotation cropping with conventional and none fertilization in Chilgog clay loam soils were determined as follows. The populations of B. japonicum in soils were increased from about 10¹ in continuous paddy upto 10³cells/g.soil only in one-year rotation of upland use with soybean cropping. Compared to the densities in plots of conventional fertilization, those in none fertilization were high ranging from 1.9 to 10 fold in 2-year upland use rotation and both in 3-year upland use rotation and 4-year upland use, respectively. The populations were positively correlated with soil organic matter contents(r=0.83^*), Ca/K(r=0.74^*), and(Ca+Mg)/K(r=0.72^*) and were negatively correlated with soil hardness(r=-0.73^*). And the soil populations increased by paddy-upland rotation resulted in superior symbiotic potentials to those in continuous paddy use in terms of nodule mass, nitrogenase activity, and soybean shoot dry weight.