Abstract: In order to investigate the appropriate depth of root cutting for peanut, and provide theoretical and technical basis for peanut high-yield cultivation, the effects of depth of root cutting on the photosynthetic characteris- tics and dry matter accumulation were studied by using the box-planting methods. The results showed: Different depths of root cutting treatments all reduced leaf chlorophyll content, net photosynthetic rate, leaf area per plant, stem and leaf dry matter weight, root dry matter weight and pod dry matter weight in a short time after root cutting. Moreover, the decrease range of them showed increasing trend with the increase of root cutting depth. In afterwards, the effects of the suitable depth of root cutting on leaf chlorophyll content, net photosynthetic rate, leaf area per plant, stem and leaf dry matter weight, root dry matter weight and pod dry matter weight were higher than these of the control, and of them sometimes reached to significant or extremely significant level. However, excessive root cut- ting can cause leaf chlorophyll content, net photosynthetic rate, leaf area per plant, stem and leaf dry matter weight, root dry matter weight and pod dry matter weight lower than the control. This showed that moderate root cutting of peanut in early growing stage can regulate and control the growth of root system, in afterwards, bring with compensa- tion and super compensation effect on peanut growth and development, and excessive root cutting has no compensa- tion effects. This research suggested that moderate depth of root cutting is between 10 to 15 cm.

Key words: Peanut, Root cutting, Depth, Photosynthetic characteristics, Dry matter accumulation

CLC Number: 

• S565.01