Effect of the planting stock treatment with high nitrogen and coating urea on the growth and yield in rice [Oryza sativa] plants after transplanting
1997
Ehara, H. (Mie Univ., Tsu (Japan). Faculty of Bioresources) | Watanabe, N. | Morita, O. | Goto, M. | Asahara, O. | Iwamura, Y. | Miyazaki, Y.
The effects of temporally high N treatment prior to the transplanting and coating urea application on the growth and yield were investigated to develop a fertilization method for low-input rice cultivation through labor-savings and a decrease in the application amount. High N treatment and coating urea plot (LT plot: 3.15 kgN/10a), coating urea plot (L plot: 3 kgN/10a) and high N treatment plot (T plot: 0.15 kgN/10a) fare the yield by 83%, 82% and 76% of control plot (C plot: 6 kgN/10a), respectively. There was no significantly difference in the yield among the four plots. Yield of 0N plot was 69% of C plot and was significantly low compared with that of the C plot. Distinctive differences in panicle number per hill and 1000 grains weight was not found among the five plots.The spikelet number per panicle was greatest in the C plot, followed by the L plot, LT plot, T plot and 0N plot, while the differences between the L plot, Lt plot and T plot were not significant. The difference in spikelet number per panicle was attributed to the differences in the tillering pattern and nitrogen content per stem. The first tiller emerged from the 6th node in the 0N plot and from the 5th node in the other plots. Rice plants in the 0N plot had panicles having a smaller number of spikelets compared with those in the other plots. The top dressing for the c plot attained a higher nitrogen content per stem. Filled grain percentage was lower in the c plot than in the other plots. From thee results, it was considered that securement of a sufficient yield with labor-savings compared to standard cultivation and the decrease of the amount of fertilizer application by the high N treatment and coating urea application would be possible
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