The effect of manure and chemical fertilizer on vegetative growth of off-season durian
production had been studied in the experimental plots in local orchards of Mr. Prapan
Dangphom, located in the Krungching sub - district, Noppitum district, Nakhon Si Thammarat
province, Thailand. Ten-year–old field-grown durian trees were used in this study during
January, 2014 to June, 2014. A completely randomized design (CRD) with single tree plots
replicated five times, a total of 45 durian trees was used as experimental units where one tree
represent a replicate of the different treatments as follows : 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 2 kg/tree + chicken manure at the rate
15 kg/tree 8) chemical fertilizer 15-0-0 (NPK) at the rate 2 kg/tree + cow manure at the rate 25
kg/tree and 9) chemical fertilizer 15-0-0 (NPK) at the rate 2 kg/tree + chicken manure at the
rate 15 kg/tree. The results showed that the number of days after treated to leaf flushing were
not a significant difference. The percentage of leaf flushing after treated were significant
difference (P ≤ 0.05), the treatment 7 : chemical fertilizer 15-15-15 at the rate of 2 kg/tree +
chicken manure at the rate 15 kg/tree was shown the highest percentage of leaf flushing by
85.80 percent and follow by treatment 6 : chemical fertilizer 15-15-15 at the rate 2 kg/tree +
cow manure at the rate 25 kg/tree had been the percentage of leaf flushing by 83.00 percent, the
untreated tree had the percentage of leaf flushing is the lowest by 33.40 percent. The number of
days from leaf flushing to leaf maturing were significant difference (P ≤ 0.05), treatment 7:
chemical fertilizer 15-15-15 at the rate of 2 kg/tree + chicken manure at the rate of 15 kg/tree
and treatment 9: chemical fertilizer 15-0-0 at the rate of 2 kg/tree + chicken manure at the rate
of 15 kg/tree was shown the least number of days from leaf flushing to leaf maturing average
40.40 and 41.00 days, respectively. The untreated trees was showed the leaf flushing to leaf
maturing is the longest number of days average 45.40 days. The number of times of leaf
flushing of all treatments were not significant difference had been showed average 2-3 times