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ON RELATION OF SOIL MOISTURE TO DEVELOPMENT OF RICE BLAST DISEASE WITH SPECIAL REFERENCE TO RESULTS OF INOCULATION EXPERIMENTS ON LEAVES AND SPIKE PEDICELS OF PLANTS GROWN IN SOILS DIFFERING IN MOISTURE AND IN AMOUNTS OF SILICA AND FERTILIZER,
ARMY BIOLOGICAL LABS FREDERICK MD
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Results are reported of inoculation experiments on rice seedlings, adult leaves, and the spike pedicel of rice plants grown on soils with varying moisture content, and fertilizer and silica application. The susceptibility of the rice plant to rice blast disease varied inversely with the moisture content of the soil irrespective of the amount of fertilizer or silica applied or of the stage of growth of the plant. Dryness of the soil tended to increase the rate of infection while wetness of the soil decreased infection. With or without silica, rice plants grown on dry soil with standard fertilization were more easily infected than plants grown on irrigated soil with double the amount of fertilizer. This proves that even with double the amount of fertilizer, if the soil was well irrigated, the rate of infection could be reduced to less than that for plants grown on dry soil with standard fertilization. Author
APPROVED FOR PUBLIC RELEASE