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Response of Cassava Variety TMS/98/0505 to Potassium Fertilization and Time of Harvest in South Eastern Nigeria
Abstract
Two field experiments were used to study the response of a low cyanide cassava variety TMS/98/0505 to potassium fertilizer and time of harvest in a tropical ultisol in south eastern Nigeria in 2005/06 and 2006/07. In each year, a split plot design was adopted for the experiment with treatments arranged in a randomized complete block design (RCBD). The main plot treatments were five rates of potassium (0, 50, 100, 150 and 200 (Kg/ha) while the sub-plot treatments were five times of harvest (6, 8, 10, 12 and 14 months after planting (MAP). Potassium application significantly increased plant height and storage root dry matter yield but had no effect on number of storage roots per plant. Plant height was increased with application of potassium up to 150 Kg K/ha while storage root dry matter yield increased when potassium was applied up to 50 Kg K/ha. Optimum storage root dry matter yield was obtained at 12 MAP. Both fresh root and dry matter yields were significantly low at 6 MAP. Except for plant height, there were generally no statistically significant effect of potassium fertilizer and time of harvest interactions on cassava crop.
Keywords: Potassium, Time of harvest, TMS/98/0505, Storage root yield.
