Impact of Different Leaf Harvesting Levels on Growth and Yield of Cassava Varieties
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Abstract
Appropriate leaf harvesting may be an approach to increase the utilization of cassava. However, excessive leaf removal may negatively affect growth and yield. This study aimed to investigate effects of leaf harvesting from the middle and lower levels of the canopy on growth and yield of the cassava cultivars Kasetsart 50 and Rayong 9. The experiment was conducted at the experimental field of the Department of Plant Science, Faculty of Agriculture and Technology, Nakhon Phanom University, using a split-plot in a randomized complete block design with three replications. The main-plot factor was the leaf harvesting level, consisting of 0 (control), 10, 20 and 30% of the total number of leaves on the canopy, and the sub-plot factor was two different cassava variates including Kasetsart 50 and Rayong 9. Six plants per subplot were sampled at 30, 90, 150 and 210 days after planting (DAP). Leaves were collected from the middle and lower levels of the canopy before plant sampling from all three treatments at 90 DAP for protein analysis. The marginal rate of return was also calculated. The study demonstrated that at 90 DAP, the 30% leaf harvesting level resulted in the highest fresh leaf and protein yields. However, at 150 and 210 DAP, the 10% leaf harvesting level led to higher growth and yield than the 20% and 30% leaf harvesting levels, but its effect was not significantly different from the control. In this study, there was no interaction between the leaf harvesting levels and cassava cultivars across all trials and growth stages. Additionally, although the 10% leaf harvesting level resulted in a low fresh leaf yield, it provided a worthwhile marginal rate of return from selling storage root and leaves for both cassava cultivars.
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บทความที่ได้รับการตีพิมพ์เป็นลิขสิทธิ์ของ วารสารวิทยาศาสตร์และเทคโนโลยี มหาวิทยาลัยอุบลราชธานี
ข้อความที่ปรากฏในบทความแต่ละเรื่องในวารสารวิชาการเล่มนี้เป็นความคิดเห็นส่วนตัวของผู้เขียนแต่ละท่านไม่เกี่ยวข้องกับมหาวิทยาลัยอุบลราชธานี และคณาจารย์ท่านอื่นๆในมหาวิทยาลัยฯ แต่อย่างใด ความรับผิดชอบองค์ประกอบทั้งหมดของบทความแต่ละเรื่องเป็นของผู้เขียนแต่ละท่าน หากมีความผิดพลาดใดๆ ผู้เขียนแต่ละท่านจะรับผิดชอบบทความของตนเองแต่ผู้เดียว
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