Page 9 - การศึกษาประสิทธิภาพจุลินทรีย์ซุปเปอร์ พด.9 ต่อการเพิ่มความเป็นประโยชน์ของฟอสฟอรัสและผลผลิตข้าวในดินกรดจัดภาคตะวันออกเฉียงเหนือของประเทศไทย

Abstract

The objective of this study was to study efficiency of microbial super LDD 9 for

increasing available phosphorus in soil and rice yields in acid soil of northeast part of
Thailand. The experiment was conducted in both green house and field condition on Si
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Thon soil series. It was acid soil with pH 4.80 which has 3.00 mg kg available
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phosphorus from total phosphorus 14 mg kg . The green house experiment composed
of 5 treatment with 3 replications in Completely Randomized Design which consisted of
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control, application with LDD9 inoculum 100 kg rai and 3 rates of super LDD 9 inoculum
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50, 100 and 150 kg rai . The results showed that treatment used 100 kg rai of
microorganisms activator super LDD 9 had the highest phosphate solubilizing microbial
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population, 2.07 x 10 CFU g soil and available phosphorus ranged from 6.50-10.36 mg
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kg . The effect on height of rice 97.67 cm., number of tiller per plant 11.67, rice yields
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12.96 g clump and the lowest of grain blighted was 11.67 grains per ear.
A field experiment was conducted at farmer field in Yasothon province. The

experiment design was randomized complete block design. There were 7 treatments
in 3 replications which consisted of (1) control (2) lime with chemical fertilizer N and
K (3) lime with chemical fertilizer N, P and K (4) application of microbial LDD 9 with N
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and K including 3 application rate 50, 100 and 150 kg rai of microbial super LDD 9 in
treatment 5, 6 and 7. The result showed that the application of lime with N, P and K
fertilizer effected to increase soil available phosphorus after harvesting and rice yield
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that is 15.00 mg kg and 413.33 kg rai respectively. Application of super LDD 9 with
chemical fertilizer and lime with chemical fertilizer had no significant difference in
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available phosphorus. There were 9.33 and 9.00 mg kg in the rate of super LDD 9
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with 100 and 150 kg rai respectively. In addition rice yield were 400.00 and 393.33
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kg rai respectively. Both treatments were not significant difference from treatment
that used lime with chemical fertilizer. However available phosphorus content when
application with microbial super LDD 9 was higher than microbial LDD 9 at rate of
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100 kg rai which gave soil available phosphorus 7.67 mg kg and 353.33 kg rai of
rice yield. For economic return, treatment using lime with chemical fertilizer followed
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by soil analysis showed highest economic return as 1,151.49 bath rai and followed
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by treatment using microbial super LDD 9 rate 100 kg rai . As 1,065.00 Bath rai . In
addition treatment using 3 rate of microbial super LDD 9 performed more economic
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return than microbial LDD 9 rate 100 kg rai . Thus the recommendation rate of super
LDD 9 for increasing available phosphorus in acid soil of Northern part of Thailand
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was 100 kg rai .