Studies on the Growth of Rice Plants Cultivated in Different Seasons. : III. Growing phase and influences of climate and other factors on higher yield in early transplanted rice.

Abstract

1) Changes of the growing phase, chemical components and the root development in early transplanted rice showed similar tendencies to those in the plant of "early-season-culture". (I, II). 2) The grain yield by early transplanting culture was proved higher than that by ordinary culture; the result was assigned mainly to the increased numbers of panicles and grains per unit area and non-reduction of ripening-percentage in spite of the increase in grain numbers. 3) The increases of tillers and panicles in early transplanted rice are considered to have been induced by higher percentages of nitrogen, total sugar and starch in the plant at the tillering stage, the accumulation being possibly assignable to lower temperatures during the early stages of growth. 4) Moreover, or later stages abundant sunshine and many healthy roots after the heading time might have promoted assimilation and smooth translocation of carbohydrates to the numerous grains in early transplanted rice.