長崎県北部中山間水田における水稲葉枯症の実態調査とその要因

日本作物学会紀事

渡邉 大治¹ 

[1] 長崎県農林部

关键词: Dry wind;    乾燥風;    Nagasaki;    長崎県;    Paddy field in hilly and mountainous area;    中山間地水田;    Rice “hakare” symptom;    水稲葉枯症;    Solar radiation;    日射量;   

DOI  :  10.1626/jcs.83.39

学科分类：农业科学（综合）

来源: Nihon Sakumotsu Gakkai / Crop Science Society of Japan

【 摘 要 】

We conducted a field survey to determine the causes of rice leaf injury observed in rice paddy field located in hilly and mountainous northern regions of Nagasaki. (1) Solar radiation in the mountainous region where the rice “hakare” symptom occurred was about 20% lower than that of the low altitudes. (2) The top / root ratio of the rice plant (dry weight basis) was higher in the injured rice than that with normal growth. (3) Our results suggest that delaying the time of transplanting than the conventional cultivation reduces the occurrence of rice “hakare” symptom. (4) With the approaching of low pressure system at the end of rainy season, the local dry wind blows up in the mountainous rice paddy areas and the difference in temperature and humidity between high and low altitudes become larger. From the above, we concluded that rice “hakare” symptom occurs as a result of the following factors. The imbalance growth between the above-ground and underground parts of the rice plant due to the shortage of solar radiation during rainy season, and the dry wind peculiar to the mountainous region enhanced the transpiration from the leaves and stems cause a deficiency of water in newly growing leaves.

【 授权许可】

Unknown