Characteristics of dry matter production in direct-sown rice (Oryza sativa L.) in submerged paddy field
2001
San-oh, Y. | Tomizawa, Y. | Ookawa, T. | Hirasawa, T. (Tokyo Univ. of Agriculture and Technology, Fuchu, Tokyo 183-8509 (Japan). Faculty of Agriculture)
Dry matter production and the related characters of direct-sown rice plants in the submerged paddy field (D plants) were compared with transplanted plants (T plants) by using Takanari and Chugoko 153, as a lodging-resistant cultivar and line, respectively. The D and T plants were grown at the planting density of 51.3, 66.6 (22.2 hills) per sq m, respectively. Grain yield was larger significantly in the D plants because of their higher dry matter production. The higher dry matter production in the D plants resulted from the larger interception of solar radiation of the canopy in the tillering stage and also the better light-intercepting characteristics of the canopy after the panicle formation stage. The D plants produced large number of tillers rapidly in the tillering stage, and developed a canopy with larger leaf area and larger interception of solar radiation. After the interception exceeded 90% of the radiation in the panicle formation stage, the canopy of the D plants consisted of leaves with larger angle from horizontal, yielding a low value of extinction coefficient. Furthermore, estimated chlorophyll content of lower leaves on a stem was kept higher during ripening in the D plants. This might also contribute to their higher dry matter production
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