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ห้องสมุดกรมพัฒนาที่ดิน

2

Abstract

Effect of using bio fertilizer and high quality fertilizer with to the size and weight of
oil palm fruit bunches in acid sulfate soil at phattalung province. The objective of this study
is appropriate management method of acid sulfate soil for the growth of oil palm aged 5
years. The objective of this study was to study the management of acidic soils suitable for
the growth and yield of oil palms aged 5 years and over. The experiment was conducted in
Moo 2, Pak Phayun Sub-district, Pak Phayun District. Phatthalung Province, for 3 years from

2018-2020. The experiment was Randomized Completely Block Design (RCBD). Which 9
treatments, 3 replications, The treatments were 1) control 2) farmer’s method 3) using
chemical fertilizers according to soil analysis. 4) using chemical fertilizing at half rate of
recommended by soil analysis and 5 kg per plant of high quality organic fertilizer 5) using
chemical fertilizing at half rate of recommended by soil analysis and 10 kg per plant of high
quality organic fertilizer 6) using chemical fertilizing at half rate of recommended by soil
analysis and 15 kg per plant of high quality organic fertilizer 7) using chemical fertilizing at

half rate of recommended by soil analysis and 5 kg per plant of bio-fertilizer super LDD12 8)
using chemical fertilizing at half rate of recommended by soil analysis and 10 kg per plant of
bio-fertilizer super LDD12 9) using chemical fertilizing at half rate of recommended by soil
analysis and 10 kg per plant of bio-fertilizer super LDD12. This research was studied in a
chemical properties of soil, size and weight of oil palm bunches, 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 except fertilized chemical fertilizer according to soil analysis
from lab treatment. Total nitrogen of soil increased in every treatments except control
treatment. The phosphorus potassium calcium and magnesium are increased with every
treatments. In addition, T8) using chemical fertilizing at half rate of recommended by soil
analysis and 10 kg per plant of bio-fertilizer super LDD12 gave the highest of an average
circumference of oil palm bunches, weight per bunch and the highest yield of palm oil. The

mean values were 95.05 centimeters and 11.90 kilograms per bunch and 3,215.29 kilograms
per rai per year, respectively. For the economic returns, T8) using chemical fertilizing at half
rate of recommended by soil analysis and 10 kg per plant of bio-fertilizer super LDD12 was
provide the best economic return. There was a return above all costs is 3,296.45, 4,575.05 and
3,769.48 Baht per rai per year, respectively.

Keywords : Oil plam, Acid Soil, Soil Group 14, Bio-Fertilizer, High quality organic fertilizer