Abstract
The yielding ability and the effect of fertilization on yield were investigated in ratoon crop rice in early-season cultures. The total leaf number of each tiller in the ratoon crop was compared with Katayama's theoretical total number of leaves. The ratoon crop produced about 30% of the grain yield of the parent crop. Fertilization of the ratoon crop increased the panicle number per hill, resulting in an increased yield. Ratoon tillers were separated from the main stem to determine their tillering position on the stem, and to find the effect of fertilization on regrowth of tillers. Yield increase by fertilization was mainly due to the increase in the number of ripened secondary tillers. Tillers had 2∼3 more leaves than the total leaves expected from the theory of synchronous growth of leaves and tillers. The investigation of growth of lateral buds at each growth stage of the parent crop showed that the relation between growth of the main stem and lateral bud growth of ratoon tillers was not synchronized, resulting in the increase of total leaf number over the theoretical one.
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