Effect of Harvest Time and Nitrogen Doses on Cassava Root Yield and Quality

摘要: ABSTRACT: Nitrogen is considered the most limiting nutrient for cassava, and N availability can influence crop cycle, including earlier harvest. The aim of this study was to effect harvest time on production components “Aciolina” cultivar, at different rates fertiliser. experiment carried out in an area newly incorporated into productive system a savannah ecosystem northern Amazon. A randomised block experimental design used split plot arrangement with four replications. (0, 30, 60, 150, 330 kg ha -1 ) were allocated main plots, times (90, 120, 180, 240, 300, 360 days after emergence stalks - DAE) subplots. Plant height, shoot fresh matter yield, number roots per plant, average root diameter, yield display increasing linear response up DAE cassava cv. “Aciolina”. For all times, promote increase yield. At 300 DAE, starch index show quadratic as function level. greatest efficiency topdressing occurs promoting that time, dose maximum technical efficiency, 226