Effect of defoliation at panicle emergence and anthesis on grain yield in rice (Oryza sativa L.)
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Date
1978
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Department of Agricultural Botany, College of Agriculture, Vellayani
Abstract
The contributions of the different leaves and the importance of the period between panicle emergence and anthesis to grain filling in three varieties of rice were studied by employing the defoliation technique. Jaya, a medium duration dwarf variety recorded the highest yield and yield components. Of the two short duration varieties the dwarf variety Jyothi performed better than the tall variety Ptb.10. Increasing the severity of^defoliation resulted in further reductions in yield. It was found that only the top three leaves are important in grain filling in rice. The contribution of the third leaf is lower than any of the other two leaves. Flag leaf and penultimate leaf are of equal importance in grain filling in rice. Defoliation stimulated the photosynthetic activity of the remaining green parts which compensated partially for loss of leaves. A short period of eight days between panicle emergence and anthesis was found to be important in grain filling in rice. Damage to the leaves by insects, diseases or other agents at the early heading stage could have drastic effects on grain yield in rice.
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PG
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