The optimum transplanting time and number of spikelets on yield and grain quality of the rice cultivar “Minoritsukushi”
2019
Iwabuchi, T. (Fukuoka Agriculture and Forestry Research Center, Chikushino, Fukuoka (Japan)) | Sato, H. | Ono, Y. | Ishitsuka, A. | Araki, M.
We investigated the effects of transplanting time, nitrogen application, and spikelet density on the yield and grain quality of the rice cultivar “Minoritsukushi” to determine the optimum cultivation conditions. We found that bringing the transplanting date forward from June 30 to June 17-19 increased the percentage of ripened grains, thousand-kernel weight, yield per unit, and protein content while retaining the eating quality. In addition, a second top-dressing at the panicle formation stage tended to increase the thousand-kernel weight and yield per unit and also slightly increased the protein content but had no effect on the eating quality. An increase in spikelet density increased the yield per unit but this was associated with a deterioration in the inspection grade at high densities, with < 30,000 spikelets/square m being required to pass the first inspection. Thus, the optimum spikelet density for “Minoritsukushi” was estimated to be 30,000 spikelets/square m based on the yield and quality.
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