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โครงการหนังสืออิเล็กทรอนิกส์ด้านการเกษตร เฉลิมพระเกียรติพระบาทสมเด็จพระเจ้าอยู่หัว

Table 1 Soil properties prior to experimentation at farmer’s durian orchard, Ban Na Subdistrict, Ban Na Doem
District, Surat Thani Province (2017-2018)

Soil Properties Top soil Subsoil Acceptable Range*
(0-15 cm) (15-30 cm)
pH 4.07 4.11 5.5 - 6.5
EC 1:5 (dS/m) 0.04 0.04 -
Organic Matter (%) 1.95 1.40 2.0 - 3.0
Avail. Phosphorus (mg/kg) 407 326 35 - 60
Exch. Potassium (mg/kg) 74 71 100 - 120
Exch. Calcium (mg/kg) 51 39 800 -1500
Exch. Magnesium (mg/kg) 13 10 250 - 450
Note : * Modified from Ankerman, and Large.1988.

Table 2 Rate of fertilizer application according to soil analysis and durian yield
period for fertilizer applied Fertilizer applied Application rate
1,150-490-1,710 g N-P2O5-K2O (gram/tree/year)
/tree/year
1. vegetative growth 1. fertilizer grade 21-0-0 2,000 gram together with 10-0-3
amount 4,000 gram/tree/year
2. prior flowering 2. fertilizer grade 9-25-25 1,000 gram/tree/year
3. fruit development stage 3. fertilizer grade 12-12-17 2,000 gram/tree/year
4. fruit development stage 4. fertilizer grade 0-0-50 1,000 gram/tree/year
5. before fruit ripening 5. fertilizer grade 0-0-50 1,000 gram/tree/year

Table 3 Plant nutrient concentration before experimentation in Monthong Durian leaf at farmer’s durian orchard,
Ban Na Subdistrict, Ban Na Doem District, Surat Thani Province
Nutrient concentration standard concentration* unit
Nitrogen 2.29 2.0-2.4 %
Phosphorus 0.12 0.15-0.25 %
Potassium 2.12 1.5-2.5 %

Calcium 1.21 1.7-2.5 %
Magnesium 0.31 0.25-0.50 %
Iron 60 40-120 mg/kg
Manganese 68 50-120 mg/kg
Zinc 17 10-30 mg/kg
Copper 29 10-25 mg/kg
Boron 33 30-70 mg/kg
Note : * สุมิตรา และคณะ (2544)

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