Kan khatluak lae prapprung phan thuakhieo phua phoem sakkayaphap nai kan trung nitrogen.
1991
Settha Siripin | Peerasak Srinives | Nantakorn Boonkerd
Biological nitrogen fixation potential of four hundred twenty three mungbean lines were evaluated. There were difference in components of nitrogen fixation such as; nodule number per plant, nodule dry weight, nitrogenase activity, amount of nitrogen fixed and total amount of nitrogen in the plant. Mungbean lines VC 1948, VC 1776, VC 3182, VC 1830, VC 1693 and VC 2335 were potentially high in nitrogen fixation when compared to those efficially recommended cultivars in Thailand. 15N Natural Abundance method revealed that these mungbean lines could fixed atmospheric nitrogen differently ranging from 0 to 300 mg-N per plant after 33 days of planting. Most of the nitrogen absorbed by mungbean was contributed from nitrogen fixation. Among the 423 mungbean lines, the most effective N2-fixing one was F7 VC 2768 A/1560 D line 2 which amounted to 19.2 kg-N per rai. This amount of N-fixed could compensate for the N fertilizer as much as 235 to 300 baht per rai. Nitrogen fixation of these mungbean lines were not the same. Partition of nitrogen source was not same during the growth stages. The nitrogen fixation of mungbean started since the development of leaf and stem and it's activity was increased to meet the peak at it's young pod developing stage (41-42 days after emergence), then, the N2-fixing activity was declined until maturity and harvest. The compatibility of cowpea rhizobial strains and mungbean lines showed no specificity. Most of inoculated strains could nodulate and fix nitrogen for these mungbean lines quite well, especially rhizobial strains USDA 3267, CB 756 eff, TAL 441, THA 302, THA 304, THA 305, NC 92 and NC 146.1. There were some strains that could enhance N2-fixation very low. Correlation between nodule number or nodule dry weigth and nitrogenase activity of nodules were relatively high.
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