Cassava stem base biochar, cassava starch
waste, cassava peel, cassava tails and stalk, and
different rates of 15-15-15 formula chemical
fertilizer hardly affected cassava root yield
differently. Applied chemical fertilizer tended to
have more influence on vegetative growth of
cassava than did the organic soil amendments.
The cassava tails and stalk applied at the rate of
6.25 t/ha with the addition of 625 kg/ha of 15-15-15
formula chemical fertilizer was likely to produce
the highest fresh root and starch yields. This
waste also had the effect on increasing soil pH
while cassava peel increased cation exchange
capacity of the soil. Further research needs to be
undertaken, especially in trying to use higher rates
of cassava peel, and cassava tails and stalk in
combination with adjusted ratio and rate of
chemical fertilizer