Journal of Crop Research
Online ISSN : 2424-1318
Print ISSN : 1882-885X
ISSN-L : 1882-885X
Research Article
Effect of difference in cropping season and seedling-raising period of short-term rice cultivars on nitrogen absorption and yield
Naohiro HiramatsuHiromo Inoue
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2021 Volume 66 Pages 55-61


Cultivation tests using rice cultivars Fujihikari and Hanahyogo, in which sowing period treatment 2 levels (I: May 12 sowing, II: June 15 sowing) and seedling raising period treatment 2 levels (S: about 20 days, L: about 30 days) were set up, were conducted and the changes in the above-ground dry matter weight, the above-ground nitrogen content during the growing season, the yield and its components were investigated. In addition, the occurrence of tillers at the maturity stage, the number of spikelets and the percentage of ripened grains for each tiller were also investigated. In both Fujihikari and Hanahyogo, the S group showed larger values than the L group during the growing period I and II, and showed a large above-ground dry matter weight, above-ground nitrogen content and yield at the maturation period. Although no significant difference was observed in the four treatments, the dry matter weight, nitrogen content and yield at the maturity stage were all IS> ⅡS> ⅠL ≒ ⅡL for Fujihikari, while ⅠS ≒ ⅡS > ⅠL ≒ ⅡL for Hanahyogo. In Fujihikari, abnormal heading was observed in 80%, 62%, and 100% of individuals in ⅠL, ⅡS, and ⅡL, respectively, but no abnormal heading was observed in all treatment groups in Hanahyogo. In all the individuals, in which abnormal heading was observed, the occurrence of higher-order bruising was observed, and a decrease in seed fertility was observed. In late transplanting cultivation in the southwestern warm region, Huahyogo was thought to have excellent adaptability, but it was suggested that the yield decreases due to the decrease in the number of spikletes when the seedling raising period is extended

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