The Response of Late Season Cassava to Chemical Fertilizer in Warin Soil Series

Abstract

Field experiment was conducted in farmer's field to investigate effects of various fertilizing methods for late season cassava in Warin Soil series. The experimental design was a split plot having 4 cassava varieties : Rayong 1, Rayong 3, Rayong 60 and Sriracha I as the main plots and 8 fertilizer treatments as the sub-plots. The main objective was to determine whether fertilizing methods formally recommended for normal season cassava (early to mid -rainy season cassava) can also be applicable for late season cassava. Mixed fertilizer grades 15-15-15 and 15-5-I0 either applied all at planting or split twice equally at planting and at 7 months after planting exerted comparable impact on increasing growth and yield of fresh tuber. Fertilizer treatments normally recommended for rainy season cassava i.e applied all fertilizer at planting tended to superior to split application. In otherwords, fertilizing method currently recommended for cassava in the rainy season can probably be applicable for late season cassava. Split application of fertilizer for late season cassava had no beneficial effect over non-split application.