Effect of fertilizers and plant age on distribution of nutrients in Nigerian cassava (Manihot esculental)

Effects of soil fertilization and plant age on the nutrient composition of various parts of Nigerian cassava cv. were studied to identify suitable index plant tissue(s), sensitive growth stage(s) and opt. nutrient conc. to develop better fertilizer practices for the crop. The 3rd month after planting was the most sensitive stage for diagnostic sampling when N status was best reflected in leaf blades and K in petioles. N and P were most concentrated in leaf blades and least in tubers. The largest tuber yields after 12 months were associated with leaf blade analyses of 5% N, 0.4% P and 2% K at 3 months after planting.