Page 8 - ผลของปุ๋ยชีวภาพ (พด.12) ร่วมกับมูลไก่ต่อผลผลิตและคุณภาพแตงโมหลังนาข้าว Effect of Bio-Fertilizer (LDD.12) and chicken manure to yield and quality of watermelon planted after rice.

ห้องสมุดกรมพัฒนาที่ดิน

บทคัดย่อภาษาอังกฤษ (Abstract-English)

This research was conducted in Ban Ae, Ko Ae sub-district, Khuang Nai district,
Ubon Ratchathani province from October 2018 to September 2020. The objectives were to

study the rate of bio-fertilizer (which extend Nitrogen fixation microorganism, phosphorus
and potassium solvent microorganism) with chicken manure affected to quantity and
quality of after-rice water melon and economical return including soil chemical properties
changes.
The experiment design was randomize complete block with 6 treatments and 4

replications. The treatments were composed of the applications of bio-fertilizers (LDD12)
with the various rates of chicken manure compared to control plot (non bio-fertilizer and
chicken manure).

The results appeared that soil chemical properties changes were discovered. Soil pH
after the first year (pH 5.75-5.95) in each treatment were not statistically significant but
higher than before experiment (pH 4.9). However, in the second year soil pH in each
treatment were statistically significant (pH 6.35-6.70). The soil conductivity in both years

(EC = 0.018-0.043 dS/m) went down from the year before experiment (EC = 0.06 dS/m).
Soil organic matter content before and after experiment in both year were not statistically
significant which were rather low to very low (0.46-1.04 %). Soil available phosphorus after
experiment were higher than before experiment by the time that soil available phosphorus

after experiment in the first and second year were rather high and high which the values
were 19-59 and 67-109 mg/kg, respectively. Soil available potassium in the first year were
very low and low (11-48 mg/kg) while in the second year were low and moderately (43-77
mg/kg)

The application of bio-fertilizer at 1.2 tons/rai with chicken manure at 1.2 tons/rai in
the first year could produce the highest water melon yield (3.26 tons/rai) and the highest
water melon numbers (1,830 water melon/rai). However, yield and number of water melon

in the second year were not statistically significant. The water melon sweetness in both
year were not statistically significant which the sweetness in the first year and second year
were 8.50-9.28 and 7.43-9.20 % brix, respectively.
The application of bio-fertilizer at 0.9 ton/rai with chicken manure at 1.5 tons/rai
produced highest economical return in both year which was 18,392 baht/rai while the

control plot produced the economical return only 3,172 baht/rai. Therefore, this application
was the appropriate recommendation for growing water melon after rice in sandy loam soil.