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Table 13 Total soluble solids of sweet corn in sandy loam (% Brix)

Chemical Organic material
Fertilizer rate 1. No 2. Mangosteen peel 3. Mangosteen peel
(N-P 2O 5-K 2O กก./ Mangosteen rate 3.22 kg/rai rate 15.78 kg/rai Average
ไร่ peel (0.1% Tannin) (0.5% Tannin)
1. 0-5-510 15.0 15.5 14.8 15.1 a
2. 10-5-10 14.7 14.5 14.5 14.6 b
3. 15-5-10 14.3 14.7 14.5 14.5 b
4. 20-5-10 14.3 14.6 14.2 14.4 b
Average 14.6 14.6 14.5 14.6

CV (a) = 2.2% CV (b) = 2.6%
Mean in the same column followed by the same letters are not significantly different at 5% by DMRT
Table 14 Gross returns on the production of sweet corn used fertilizers in sandy loam
Treatment Yield Yield Gross Cost of Net VCR
(kg/rai) increase return fertilizer return
(kg/rai) (baht/rai) (baht/rai) (baht/rai)
1. 0-5-10 2,489 - - -

2. 10-5-10 3,070 581 4,649 966 3,683 4.8
3. 15-5-10 3,308 819 6,550 1,164 5,386 5.6
4. 20-5-10 3,222 733 5,863 1,362 4,501 4.3

1
1. MS 3.22 kg/rai+0-5-10 2,433 -56 -449 570 -1,019 -0.8
2. MS 3.22 kg/rai+10-5-10 2,920 432 3,452 966 2,486 3.6

3. MS 3.22 kg/rai+15-5-10 3,094 605 4,838 1,164 3,674 4.2
4. MS 3.22 kg/rai+20-5-10 3,316 827 6,619 1,362 5,257 4.9
1. MS 15.78 kg/rai+0-5-10 2,651 162 1,299 570 729 2.3

2. MS 15.78 kg/rai+10-5-10 3,101 612 4,896 966 3,930 5.1
3. MS 15.78 kg/rai+15-5-10 3,109 620 4,958 1,164 3,794 4.3

4. MS 15.78 kg/rai +20-5-10 3,132 643 5,145 1,362 3,783 3.8
Average 2,987
1 MS abbreviations Mangosteen peel
Fertilizers price: 46-0-0 (18 baht/kg) 0-46-0 (24 baht/kg) 0-0-60 (18 baht/kg) and organic fertilizer (3

baht/kg) yield price (8 baht/kg)

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