Effects of meteorological factors and transplanting time on milky white rice [Oryza sativa] kernels for 'Koshihikari'
2008
Tsukimori H.(Shimane-ken. Agricultural Technology Center, Izumo (Japan))
The effects of meteorological factors and transplanting time on milky white rice kernels for 'Koshihikari' were investigated. 1. A high positive correlation was observed between milky white rice kernels and high temperature during 20 days after heading. For keeping milky white rice kernels below 6 %, the minimum temperature needs to keep less than 22.5 deg C. 2. It was suggested that milky white rice kernels of late planting was decreased when the temperature during grain filing period fell and the rate of grains number per straw weight was decreased. 3. The maximum number of grains per square meter for keeping milky white rice kernels less than 6 % at early planting and late planting was 25,000 and 28,000, respectively. 4. In conclusion, it's necessary to determine the quantity of nitrogen topdressing at panicle formation stage not to exceed the maximum number of grains per square meter for the production of good quality rice.
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