Effect of the nitrogen application and planting density on the growth and yield of a rice variety Dontokoi
Hara, Y.; Toriyama, K.
Bulletin of the Hokuriku National Agricultural Experiment Station 1997(40): 79-85
The effect of nitrogen application (0, 5, 10, 20 gN/m2) and planting density (11, 22, 44 hills/m2) on the growth and yield of a rice variety "Dontokoi" was examined in 1996. Nitrogen was basally applied by controlled available fertilizer. The plant height, the number of tillers and the dry weight increased in accordance with the amount of applied nitrogen. The growth rate was more rapid in high-density plots than that in low-density plots. The number of ears and yield in high-density plots were also more than those in low-density plots. The maximum yield (830 g/m2) and maximum number of husks (45,000 husks/m2) was obtained from the high density-plot with large amount of nitrogen (20 gN/m2). In the low-density plot with the same amount of nitrogen, both the yield (760 g/m2) and nitrogen uptake was lower than those in the high-density plot at harvest time. Such high yield in the high-density plots with large amount of nitrogen could be attributed to the rapid tillering and rapid production of dry matter at the initial growth stage. Therefore, high yield would be obtained in a rice variety "Dontokoi" under high density of planting with a large amount of nitrogen that was supplied basally by controlled available fertilizer.