Phosphine Fumigation Influence on Rice Seed Germination and Vigor
- V. Krishnasamy and
- D. V. Seshu *
Fumigation of seeds is one of the quarantine precautions directed against the international spread of pests. Seed treatment should ward off the pests without hampering seed germination and vigor. A study was conducted to evaluate the effect of fumigation with phosphine at different doses, exposure times, and seed moisture contents, and after the seed has been treated with fungicides on seed germination and seedling vigor in rice (Oryza sativa L.). The fumigated seed was evaluated for germination and vigor, initially and after 90 d of storage. At the normal recommended dose of 3 g m−3, fumigation did not affect germination or vigor. At 6 g m−3, vigor decreased. The effect became more perceptible after 90 d of storage. Long exposure time (6 d) showed deleterious effects. Entry differences were not significant under any of the treatments with respect to germination percentage, shoot length, root length, and seedling dry weight. However, such differences were evident in the degree of seed leaching as measured by the electrical conductivity of the leachates, and dehydrogenase activity, when seed was fumigated with a higher dose (6 g m−3) of phosphine and evaluated after 90 d of storage. There were no interaction effects between fungicidal treatment with Benlate [methyl l-(butylcarbamoyl)-2-benzimi dazole carbamate] or Dithane M-45 (zinc ion and manganese ethylene bisdithio carbamate) and fumigation on seed germination and vigor.
Copyright © 1990 by the Crop Science Society of America, Inc.