Effect of different depth of emergence on percentage of emergence, establishment and growth of paddy rice [Oryza sativa] under the condition of nontilling direct sowing in dry paddy field
2003
Okabe, M. (Tokyo Univ. of Agriculture (Japan)) | Tamai, F. | Motoda, Y. | Tanabe, T. | Takeda, G.
Summary : This study aims to analyse the effect of different depth of seed sowing on plant growth under the condition of direct sowing in dry paddy field. Using the cultivar, Koshihikari, plots of 1 cm depth and of 3cm depth were compared. In the 3cm plot, seed emergence was delayed and the percentage of emergence fall was about 18% compared to the 1 cm plot. The tiller number of the 3 cm plot decreased especially in the secondary tiller, and the plant showed a tendency to suppress overluxuriant growth. Then in the 3 cm plot, the percentage of productive culms increased, and the culms grew thicker, the lower internode became stronger, the resistance to lodging increased. Moreover, the ripening quality such as the percentage of ripened grains, or 1000 grain weight were greater in the 3cm plot than in the 1 cm plot.
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