A completely randomized design (CRD) with a total of 45 durian trees
were used as experimental units where one tree represent a replicate of the
different treatments. The treatments included of 9 treatments : 1) untreated
trees 2) chemical fertilizer 15-15-15 (NPK) at the rate of 4 kg/tree 3)
chemical fertilizer 15-0-0 (NPK) at the rate of 4 kg/tree 4) cow manure at the rate of 50 kg/tree 5) chicken manure at the rate of 30 kg/tree 6) chemical
fertilizer 15-15-15(NPK) at the rate of 2 kg/tree + cow manure at the rate of 25
kg/tree 7) chemical fertilizer 15-15-15 (NPK) at the rate of 2 kg/tree + chicken
manure at the rate of 15 kg/tree 8) chemical fertilizer 15-0-0 (NPK) at the rate
of 2 kg/tree +cow manure at the rate 25 kg/tree and 9) chemical fertilizer 15-
0-0 (NPK) at the rate of 2 kg/tree + Chicken manure at the rate of 15 kg/tree.