水稲の外観品質に及ぼす稲体窒素栄養条件や施肥法の影響

日本作物学会紀事

荒木 雅登¹  田中 浩平³  宮崎 真行²  内川 修² 

[1] 福岡県農業総合試験場土壌環境部;福岡県農業総合試験場農産部;福岡県農業総合試験場豊前分場

关键词: Amount of nitrogen uptake;    窒素吸収量;    Fertilization;    施肥;    Inspection grade;    検査等級;    Protein concentration;    タンパク質含有率;    Rice;    水稲;    Soil fertility;    土壌肥沃度;    Transplanting time;    移植期;    White immature grain;    白未熟粒;   

DOI  :  10.1626/jcs.79.450

学科分类：农业科学（综合）

来源: Nihon Sakumotsu Gakkai / Crop Science Society of Japan

【 摘 要 】

The effects of nitrogen content and the rate of nitrogen uptake on kernel quality of rice were examined in relation to nitrogen application and transplanting time. We clarified the amount of nitrogen application and transplanting time optimal for the soil with differences in soil fertility. On condition that the number of kernel per area was optimum, milky white, white-based and white-back kernels tended to decrease with increasing nitrogen content, and increasing rate of nitrogen uptake at panicle formation stage and full heading time. The rate of soil nitrogen absorption by rice plant, and nitrogen content of rice became high at the panicle formation stage and full heading time when transplanting time was delayed. In the field with a high soil fertility, the rate of nitrogen uptake during the panicle formation stage and full heading time, so that inspection grade was improved by the late transplanting and decreased amount of basal application. In the field with moderate soil fertility, inspection grade and yield were improved by topdressing with controlled release fertilizer at the panicle formation stage and keeping nitrogen content high at the panicle formation stage. The technique that maintains high nitrogen content and high nitrogen uptake rate during the maximum tiller number stage and panicle formation stage may be important for improving inspection grade and protein content of rice grains.

【 授权许可】

Unknown