Studies on varietal differences in growth, nodulation and nitrogen fixation in soybeans, Glycine max (L.) Merrill, 3; relationships between nitrogen fixation activity and nitrogen content of plant organs during grain filling period
1988
Kim, S.D. | Park, R.K. (Rural Development Administration, Suwon (Korea R.). Crop Experiment Station) | Junji Ishizuka (Kyushu Univ., Fukuoka (Japan). Faculty of Agriculture)
Five soybean varieties of two early maturing Karikei 73 and ss 79168, 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 nitrogen in plant organs and their roles in the nitrogen fixing activity of root nodules, the concentrations of nitrogen in plant organs during the grain filling period were measured. High positive correlation was recognized between the amount of nitrogen in plant parts and p-ARA, suggesting the higher the activity of nitrogen fixation the greater the amount of nitrogen in plant. But the relationship between the concentration of nitrogen in plant and s-ARA was positive at R4, but negative at R6. This inferred that high concentration of nitrogen at R4 gave accelerating effects on s-ARA by increasing the activity of photosynthesis in leaf-blades, while the reduced activity of photosynthesis in leaf-blades at R6 resulted in continued degradation of nitrogenous compounds in plant, and then high concentration of nitrogen in plants brought reduced supply of sugars to nodules
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