Leaf emergence pattern of late-maturing cultivars in soybeans [Glycine max]
1994
Umezaki, T. (Miyazaki Univ. (Japan). Faculty of Agriculture)
It is well known that there are a few turning points of leaf emergence rate on the main stem in soybean plants (Glycine max Merr.). On the other hand, it has also been reported that the leaf emergence rate was mainly controlled by temperature. On late-maturing cultivars grown in the Kyushu area, soybean plant growth is regular under high temperature, so there may be no turning points of leaf emergence rate. The present research was conducted to confirm this hypothesis, using give late-maturing cultivars from 1984 to 1991. The following results were obtained. Leaf emergence patterns in these eight years and five cultivars were nearly the same. It was found that the leaves on the main stem emerged regularly during the whole period of leaf emergence (from cotyledon emergence to terminal leaf emergence). By comparing the effects of different sowing dates and temperature conditions, it was found that leaf emergence patterns were the same in all treatments, whereas the leaf emergence rate by an earlier sowing (sown on June 18th) or a lower temperature (20 degrees C) treatment was slower than those of the other treatments. These results showed that there were no turning points of leaf emergence rate in late maturing cultivars. It appears that the relationship between days after sowing and leaf order could be expressed linearly. It might simplify the growth model on synchronism in soybeans
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