Studies on infant seedling transplantation for rice [Oryza sativa L.] cultivation, 2: Growth behavior and method for cultivation
1990
Takano, T. (Niigata-ken. Agricultural Experiment Station, Nagaoka (Japan)) | Naruho, S. | Abe, S. | Nagasawa, Y. | Koide, M. | Yano, K. | Imai, Y.
The growth behavior in the paddy field and yielding ability of infant seedlings were explained. And cultivation methods to make practical use of the characteristics were studied. 1) Infant seedlings showed higher resistance to low temperature and overhead flooding compared with young seedlings. The resistance was presumed to be caused by greater quantity of the remaining endsperm. 2) Compared with young seedlings, these were the infant seedlings characteristics: the panicles were generated on one node below in node order; the leaf-emergence number was decreased about one leaf; the heading and maturing stages were delayed one or two days; the plant length was shorter, but there was no difference in the number of stems. 3) The optimum transplanting time or cultivation method for the infant seedlings were the same as for the young seedlings, but a possibility of yield increase was observed because of the raising of grain number per panicle and of ripening ability through the deep flooding at the tillering stage. 4) Hatsukoshiji, Niigatawase and Todorokiwase were suitable cultivars for this culture. Koshijiwase and Koshihikari showed a slight instability, but they gained growing increment and yield almost equally as compared with young seedlings. 5) According to local adaptation examination, infant seedlings showed yield equal to, or higher than young seedlings by the same cultivation methods. 6) Infant seedlings required ample attention to establishment, because of the interference with the transplanting operation according to circumstances, owing to shorter strength of the root mat
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