Abstract
The objectives of this study were to evaluate growth, yield and nutrients removal of five cassava cultivars planted by different planting methods in late rainy season of northeastern Thailand. A split plot design was used in this study. The planting methods (vertical and horizontal) were assigned as main-plots. Cassava cultivars (Rayong-7, Rayong-11, Rayong-72, Huaybong-80 and E-dum) were assigned as sub-plots with four replications. Results showed that vertical planting gave significantly higher fresh storage root yield than those of horizontal planting, across five cassava cultivars. The cultivar Rayong-7 produced maximum fresh storage root yield across two planting methods, but not significantly different from Rayong 11, Huaybong 80 and Edum cultivars. Irrespective of nutrient removal, N, P and K removed ranges from 2.9 - 3.6, 0.8 - 1.3 and 5.3 - 7.9 kg per ton fresh root weight, respectively depending on cassava cultivar. The cultivar Rayong-7 removed the highest quantities of N, and the cultivar Rayong-11 removed maximum of P and K in the present study. Regardless of nutrient removal at different plant parts; N, P and K removed maximum quantities in leaf, stem and storage root, respectively. Planting method had no significant effect on N and P removal, but significant effect on K removal. The vertical planting removed K higher than those of horizontal planting.
Highlights
Cassava (Manihot esculenta Crantz) has been recognized as one of the most important subsidiary cash crops in northeastern Thailand
Cassava is mostly propagated vegetatively by stem cutting, the quality and cutting size are of importance for obtaining greater yields in any productive systems, and the other most important practice in cassava production is the planting method of stem cuttings at planting which depends on plant cultivar and environmental conditions [2]
The objectives of this research were to evaluate the effect of planting method on growth, yield and nutrient removal of five cassava cultivars planted in late rainy season of northeastern Thailand
Summary
Cassava (Manihot esculenta Crantz) has been recognized as one of the most important subsidiary cash crops in northeastern Thailand. There are three different planting methods usually used in the field It may be planted uprightly in a vertical position, uprightly at an angle (slant) or horizontally beneath the soil. Tuber yield was higher in the vertical and inclined plantings compared to horizontal method [3]. Planting method did not have significant effect on growth and yield of cassava [4]. Cassava planting time usually takes place at the late of the rainy season starting from October to November, and root yield can be harvested after being grown for 8 - 12 months. The objectives of this research were to evaluate the effect of planting method on growth, yield and nutrient removal of five cassava cultivars planted in late rainy season of northeastern Thailand
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