Effects of Shoot Cutting in Different Growth Stage on Yield of Sweet Potato (Ipomoea batatas L.)
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Abstract
Shoot cutting of sweet potato as plant materials for growing in the next season is general practice for farmers. This practice may negatively affect yield potential of sweet potato. Therefore, this study was aimed to examine the appropriate growth stages for shoot cutting unaffecting tuber yield of sweet potato. A randomized complete block design (RCBD) with three treatments (growth stage of shoot cutting); establishment (4wks after planting-WAP), storage root initiation (8 WAP) and storage root bulking (12 WAP) compared with no shoot cutting (control), was employed as experimental design with four replications and conducted during September to December 2017 in field plots of Plant Science Section, Phranakorn Si Ayutthaya Province. The results indicated that shoot cutting at different growth stages significantly affected shoot dry weight, tuber yield and tuber size but did not affect leaf area, chlorophyll content, chlorophyll fluorescence and tuber numbers. Shoot cutting at establishment (4 WAP) significantly reduced tuber yield and size but no effect on tuber numbers/rai whereas shoot cutting at the other growth stages did not affect tuber yield. From this study, it can be concluded that cutting of sweet potato shoot at the age more than 4 weeks after planting did not affect yield of sweet potato.
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