• The Science & Technology
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• v.15 no.7 s.158
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• pp.30-34
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• 1982

• Proceedings of the Zoological Society Korea Conference
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• 1994.10a
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• pp.110.1-110
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• 1994

• Proceedings of the Zoological Society Korea Conference
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• 1994.10a
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• pp.109.2-109
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• 1994

• Proceedings of the Korean Environmental Sciences Society Conference
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• 1999.04a
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• pp.196-198
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• 1999

• Proceedings of the Korean Environmental Sciences Society Conference
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• 1999.10a
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• pp.213-215
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• 1999

• KOREAN JOURNAL OF CROP SCIENCE
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• v.32 no.3
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• pp.323-329
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• 1987

Five soybean varieties of two early maturing Karikei73 and SS 79168, and three late maturing Tohoku76, Baegunkong and Jangbaegkong were used and evaluated in the study. Of the varieties examined, Karikei73 was characterized by the delayed leaf senescence. The varieties were planted in the pots of 1/3500 a filled with volcanic ash soil at the experimental fields of the National Institute of Agrobiological Resources in Japan. Major agronomic characteristics including the activity of nitrogen fixation for root nodules during the grain filling period were measured. Measurements during the stages were followed by the stage of development descriptions for soybeans made by Fehr and Carviness (1977). The acetylene reducing activity (ARA) per dry weight of root nodule measured using acetylene reduction assays was the highest at R4-R4.5 with decreasing trends thereafter for the early matruing varieties, while it continuously increased up to R6 but decreased rapidly thereafter for the late maturing varieties. The dry weights of root nodules and all parts of the host plant at each stage checked were greater in the late maturing varieties being the same in ARA per pot.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.32 no.4
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• pp.447-454
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• 1987

Five soybean varieties of two early maturing; Karikei 73 and SS79168, and three late maturing; Tohoku 76, Baegunkong and Jangbaegkong, were used and evaluated in the study, Of the varieties examined, Karikei 73 was characterized by the delayed leaf senescence, To investigate the periodical trends of sugars in plant organs and their roles to the nitrogen fixing activity of root nodules, the concentrations of reducing and non-reducing sugar in root and nodules during the grain filling period were measured. The concentration of non-reducing sugar in roots was not changed up to the stage of R6 for all of the varieties but it decreased rapidly thereafter for the varieties except Karikei 73. No such rapid decrease in the concentration of non-reducing sugar in the roots was observed for Karikei 73 having the characteristics of delayed leaf senescence. The concentration of reducing sugar in the root nodules was not greatly changed for all of the varieties up to the stage of R6 regardless of the earliness of varieties but increased temporarily at R6.5 when there was a rapid decrease in ARA. The phenomenon explained the fact that nitrogen fixing activities were controlled not only by supplying sugars as the source of energy for nitrogen fixation, but also by the need for fixed nitrogen of the plant. The concentration of non-reducing sugar in root nodules also increased up to the stage of R6-R6.5 but decreased at R7, which could apply the same explanation as in the concentration of reducing sugar of the root nodules.

• Journal of The Korean Society of Grassland and Forage Science
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• v.27 no.3
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• pp.167-172
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• 2007

Manure recycle is an emerging issue in agriculture in Korea these days. Farmers are keeping eye on legume mixture with grasses for nitrogen fixation and transfer to companion crops by legumes. We had a trial to investigate the effect of different legume mixtures on nitrogen fixation and transfer in spring soil. The treatment was arranged in a randomized complete block design with three replications. Three different mixtures were used(rye+hairy vetch, Italian ryegrass+crimson clover, oat+pea) and sowed in pots with paddy soil from western part of Korea(Seo Chon County). Pots with rye+vetch were transplanted from field of RDA(rural development administration) in Suwon on 2 February 2007 and other mixture treatments were sowed on early March with different sowing rate(7:3=Italian:crimson, 6:4=oat:pea). $(^{15}NH_4)_2SO_4$ solution at. $99.8\;atom%^{15}N$ was applied to the each pot at the rate of $2kg\;N\;ha^{-1}$. Application was done on 6 April at rye+vetch pots and remainder were applied on April 16. Forage were harvested from each pot at ground level in heading stage and separated into legume and grass. Total N content and $^{15}N$ value were determined using a continuous flow stable isotope ratio mass spectrometry. DM yield of rye+vetch, Italian+crimson and oat+pea were 6,607, 3,213 and 4,312 kg/ha, respectively. Proportion of N from fixation was 0.73(rye+vetch), 0.42(Italian+crimson) and 0.93(oat+pea). The percentages of N transfer from legume to grass were from 61% to 24% in different method by treatment and -35% to 21% in isotope dilution method.

• Korean Journal of Soil Science and Fertilizer
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• v.11 no.1
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• pp.1-7
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• 1978

Laboratory and pot experiment were carried out to find the symbiotic nitrogen fixing activities and the yield of dry matter on the several selected wild soybean plant. 1. Very high acetylene reducing(nitrogen fixing)activities were observed in isolated strains of Rhinchosis volubilies Lour. (924 nmole), Desmodium oldhami Oliver (844 nmole) and Glycine soja s. et z. (271 nmole/test tube/hr) while Rhizobium japonicum was only 0.6 nmole/test tube/hr. 2. On the serological reaction, eight isolated Rhizobium strains were sufficiently different to distinguish from the Rhizobium japonicum. 3. On the pot experiment with Glycine soja s. et z., A. Number of total nodules were higher in NPK+rice straw+Ca+Mo than in NoPK. However, little differences were observed in mumber of effective nodules. B. Yield of dry matter was increased with increasing of nitrogen content in plants. C. Estimated amount of fixed nitrogen in plant by an individual nodule was higher in NoPK than in NPK+rice straw+Ca+Mo.

• Korean Journal of Soil Science and Fertilizer
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• v.23 no.3
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• pp.227-231
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• 1990

A pot experiment was conducted to find out the effect of zeolite application on the growth and $N^2$ fixation of pea plants. The results are as follows. 1) The dry weight of pea plants grown with N-fertilizer application was smaller than that without N, but In was increased by application of zeolite 2) The N content in pea plants was increased by zeolite application. The N increment was smaller in 2% zeolite plots than in 1% zeolite plots. Larger amount of Ammonium were remained in the former plots. 3) The N amounts accumulated in different parts of plant derived from $^{15}N$-labelled fertilizer were decreased by application of zeolite. 4) The N derived from atmuspheric $N_2$ was increased by zeolite application. However, the application of fertilizer nitrogen depressed the enhancement of fixed-N accumulation.