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Project Name The Study on Suitable Rate of Bio Extract for increase yield of
Para Rubber on Ranong Series in Chumphon Province.
Research at registration 52 54 04 12 30002 025 102 06 11
Soil Group 51 Ranong series (Rg)

Operation Mr. Chaichana Buachum
Co-operation Miss Wanida Ngam-ngern
Miss Yuphaphon Nakwisai

Abstract

The Study on Suitable Rate of Bio Extract for increase yield of Para Rubber

in Chumphon. The experiment was conducted in Ranong soil series of Soil series group
51 at the Village No.5, Hin Kaew Sub-district, Tha Sae District Chumphon province during
October 2008 to September 2011. Randomized complete block design with 4
treatments and 5 replications were laid out. Treatments were farmers’ practice of

chemical fertilizer 15-7-18 at the rate of 90 kilogram per rai and bio-extract at the
concentration of 1:500, 1:1000 and 1:1500 applying at the rate of 150 liters per rai. The
effects of bio-exact on the physical and chemical soil, para rubber yield and benefit
cost ratio were studied. The application of bio-extract decreased bulk density, increased

soil moisture and soil acidity. The organic matter content increased due to bio-extract
but at the lowest concentration organic matter content was decreased. Bio-extract at
the concentration of 1:500 and 1:1000 increased phosphorus while at the rate of 1:1500

and the farmer’s practice of fertilizer decreased the amount of phosphorus. The
amount of potassium in the fertilizer treated varied between 35.85-39.60 mg kg-1 while
the application of bio-extract increased the amount of potassium in the second year
and decrease in the third year. The application of fertilizer gave the highest para rubber
yield of 369.60 kg rai-1 in the first year while bio-extract at the concentration of 1:1,500

gave the highest yield of 415.80 and 387.57 kg rai-1 in the second and third year
respectively. The application of bio-extract at the concentration of 1:1,500 gave the
average highest yield of 366.61 kg rai-1 while the application of fertilizer, the application

of bio-extract at the concentration of 1:500 and 1:1,000 gave the average yield 337.89,
350.62 and 296.39 kg rai-1 respectively.
The benefit cost analysis showed that using farmer’s practice of fertilizer gave
the lowest investment. The application of bio-extract at the concentration of 1:1,500

gave the highest net income and the increasing trend.