@article{Wahab_Hassan_Lugo-López_1978, title={Performance of Twenty Cassava Cultivars on Marginal Peats and Peaty Clays of Guyana}, volume={62}, url={https://revistas.upr.edu/index.php/jaupr/article/view/10345}, DOI={10.46429/jaupr.v62i4.10345}, abstractNote={A cassava trial including 20 cultivars was conducted to assess the suitability of Guyana’s marginal Anira peat No. 20 and Inki clay No. 100 for this crop during a 12-mo growing period. Germplasm material was obtained from Brazil, Colombia, Mexico, Puerto Rico, and Guyana. Cultivars Tacana and Iracema (Brazil) ranked above all others on both soils, producing 28 t/ha fresh roots on the Anira peat and 24 t/ha on the Inki clay. All introduced cultivars outyielded their local counterparts. The highest yielding native cultivar, Badwoman, produced 12 and 10 t/ha of fresh roots on the Anira peat and Inki clay, respectively. Cultivar M Col 673 had the highest root dry matter content, about 40% for both soils. Edible fresh matter content (ratio of peeled to unpeeled root) averaged 0.85 and was essentially the same for all cultivars. A highly significant relationship was obtained between total plant weight and root yields on both soils (<em>r</em> = 0.92 and 0.94). and between harvest index and root yields (<em>r</em> = 0.64 and 0.81). The number of stems per cutting and stem diameter at harvest were not related to yield. However, number of edible roots per plant was highly correlated with yield (<em>r</em> = 0.69 and 0.54). Root thickness was also related to yield (<em>r</em> = 0.92 and 0.95) on both soils. Under field conditions, all cultivars stored well for 5 days before primary deterioration began.}, number={4}, journal={The Journal of Agriculture of the University of Puerto Rico}, author={Wahab, Abdul H. and Hassan, Imran and Lugo-López, M. A.}, year={1978}, month={Oct.}, pages={343–354} }