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ห้องสมุดกรมพัฒนาที่ดิน

2

Abstract
Effect of using bio fertilizer and reduce chemical fertilizer rate to increasing on oil

plam in acid sulfate soil at phattalung province. Province on October 2018 to September
2020 that used a randomized complete block design with 9 treatments, 3 replications. The
treatments were 1) control 2) farmer,s method 3) fertilized chemical fertilizer according to
soil analysis from lab 4) 30 percent fertilized chemical fertilizer according to soil analysis

from lab and 5 Kg per plant of bio-fertilizer 5) 30 percent fertilized chemical fertilizer
according to soil analysis from lab and 10 Kg per plant of bio-fertilizer 6) 30 percent
fertilized chemical fertilizer according to soil analysis from lab and 15 Kg per plant of bio-
fertilizer 7) 40 percent fertilized chemical fertilizer according to soil analysis from lab and 5

Kg per plant of bio-fertilizer 8) 40 percent fertilized chemical fertilizer according to soil
analysis from lab and 10 Kg per plant of bio-fertilizer and 9) 40 percent fertilized chemical
fertilizer according to soil analysis from lab and 15 Kg per plant of bio-fertilizer. This
research was studied in a chemical properties of soil, growth and productivity oil plam, cost

and economic returns. The result showed that pH of soil was higher in treatment with
organic fertilizers compared to those without organic fertilizers. Lime requirement of soil
with treatment organic fertilizer was lower compared to treatment non-organic fertilizer

applied. Organic matter of soil increased in every treatments. Total nitrogen of soil
decreased in all treatments except 30 percent fertilized chemical fertilizer according to soil
analysis from lab and 15 Kg per plant of bio-fertilizer and 40 percent fertilized chemical
fertilizer according to soil analysis from lab and 15 Kg per plant of bio-fertilizer. The
phosphorus potassium calcium and magnesium are increased with every treatments. In

addition, for the treatment 30 percent fertilized chemical fertilizer according to soil analysis
from lab and 15 Kg per plant of bio-fertilizer showed that Leaf length leaf width bunch
number and yield of oil palm was the highest as 81.43, 4.39 cm. 15.86 pruning per plant

per year and 3,392.64 Kg per rai per year, respectively. And last showed that the economic
return, in the year 2018 there was income above negative variable costs or loss at every
turn. While in the year 2019 and 2020 of treatments 30 percent fertilized chemical
fertilizer according to soil analysis from lab and 15 Kg per plant of bio-fertilizer had the

highest income above variable costs at 1,389.08 and 7,317.32 baht per rai, respectively.

Keywords : Oil plam, Acid Soil, Soil Group 14, Bio-Fertilizer