Difference in Root Growth of Potato Plants among Years and Cropping Seasons

Japanese Journal of Crop Science

Kazuto IWAMA¹ 

关键词: Annual difference;    乾物生産;    Dry matter production;    根重;    Root dry weight;    作期間差異;    Root respiration rate;    根呼吸速度;    Seasonal difference;    年次間差異;    Solanum tuberosum;    バレイショ;   

DOI  :  10.1626/jcs.57.346

学科分类：农业科学（综合）

来源: Nihon Sakumotsu Gakkai / Crop Science Society of Japan

【 摘 要 】

To clarify the role of the roots on the dry matter production and the tuber yield of the potato plants (Solanum tuberosum), the dry weight and respiration rate of the roots up to 30 cm in depth were investigated at 4-6 times during the growing season with 1-2 main variety (s) at autumn cropping for 3 years and at spring cropping for 1 year. 1. The difference in root DW among years and cropping seasons became apparent at a relatively early stage before initial flowering, being much larger than the difference in LAI. 2. The difference in root activity among years and cropping seasons was much smaller than the difference in root DW. 3. During one month after initial flowering, the difference in photosynthetically active radiation intercepted by the canopy could not fully explain the difference in CGR. On the other hand, the root DW showed a highly positive correlation with CGR (r=0.971) and tuber bulking rate (r=0.993). It was concluded that the difference in root growth among years and cropping seasons would be one of the major factors affecting dry matter production during the tuber bulking period and tuber yield.

【 授权许可】

Unknown