Nodulation, nitrogen fixation and growth of soybean plants (Glycine max Merr.) in soil supplemented with chitin or chitosan
1997
Ali, M. (Gifu Univ. (Japan)) | Horiuchi, T. | Miyagawa, S.
Pot soil was supplemented with varying concentration of chitin or chitosan to investigate their influence on the nodulation, nitrogen fixation and growth of soybean plants. Significant (P=0.05) reductions in nodule fresh weight and nitrogen fixation (measured as acetylene-reduction activity) were observed at the early growth stage (28 DAP) for plants grown in soil supplemented with chitin or chitosan as compared to regular pot soil. However the nodule numbers were not affected at the early growth sage with the exception of 1% of chitin or chitosan. Both nodulation and nitrogen fixation activity at a later growth stage (42 DAP) were markedly enhanced in soils supplemented with 0.10% of either chitin or chitosan. These results suggest that all concentrations of chitin or chitosan have a sever influence on nodule development and N2-fixation activity at the early growth stage in soybean plants. The production of total dry matter was higher in untreated control plants at 28 DAP, while plants treated with0.10-0.25% chitin or chitosan produced higher dry matter at 42 DAP. Soybean seed yield increased with the increasing pod number at these levels of treatment. However, the above parameters did not differ greatly between chitin and chitosan at corresponding levels of concentration
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