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ห้องสมุดกรมพัฒนาที่ดิน

Abstract

The study involved the application of high quality organic fertilizer to improve
fertility of seashore sandy soil used for planting Chinese Kale in Kung Krabaen Bay

Royal Development Study Center. The experiment was conducted between 2014
and 2016 in Khlong Khut Sub-district, Tha Mai District, Chanthaburi Province, aiming
to investigate certain changes in property of sandy soil, the growth and yield of Kale
and economic return. The experiment was categorized as Randomized Complete

Block Design consisting of 8 treatment with 3 replications including 1) control
(no chemical fertilizer and organic fertilizer added) 2) adding chemical fertilizer as
recommended by the Department of Agriculture (20-11-11) at the rate 100 Kg./Rai

3) adding chemical fertilizer based on soil analysis (20-5-15) at the rate 100 Kg./Rai
together with high quality organic fertilizer with Nitrogen (600 Kg./Rai) 4) chemical
fertilizer (0-0-60) 5 Kg./Rai together with high quality organic fertilizer with Nitrogen
(100 Kg./Rai) (the ratio recommended by the Department) and adding high quality
organic fertilizer with Phosphorus (50 Kg./Rai) 6) chemical fertilizer 20-11-11

(50 Kg./Rai) together with high quality organic fertilizer with Nitrogen (100 Kg./Rai) and
high quality organic fertilizer with Phosphorus (50 Kg./Rai) 7) chemical fertilizer
20-11-11 (50 Kg./Rai) together with high quality organic fertilizer with Nitrogen

(50 Kg./Rai) and high quality organic fertilizer with Phosphorus (25 Kg./Rai) 8) chemical
fertilizer 20-11-11 (25 Kg./Rai) together with high quality organic fertilizer with
Nitrogen (50 Kg./Rai) and high quality organic fertilizer with Phosphorus (25 Kg./Rai).
Findings from the study suggested that application of high quality organic fertilizer

with Nitrogen 600 Kg./Rai together with chemical fertilizer (0-0-60) for 5 Kg./Rai, the
treatment with highest level of organic fertilizer, had highest level of effect on
quantity of organic matter, Nitrogen and conductance after the experiment. Solely
using chemical fertilizer as recommended by the Department of Agriculture, namely,

20-11-11, for 100 Kg./Rai gave highest amount of Phosphorus and Potassium after the
experiment while all treatments could increase soil pH.

With respect to the growth of Chinese Kale, it was discovered from all
treatments that the fresh weight and height of Chinese Kale increased in the last
year. In respect of leaf width and leaf number of Chinese Kale, it appeared that all

treatment gave similar leaf size and numbe. Adding chemical fertilizer (20-11-11) at
the rate of 25 Kg./Rai together with high quality organic fertilizer with Nitrogen for