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ห้องสมุดกรมพัฒนาที่ดิน

Abstract
Managements of compost and bio-fertilizer association with bio-extract for
increasing yield of Holland papaya in sandy soils. This project were proceeded in
Nongplub Sub-district, Hua Hin District, Prachuabkirikhan Province, from 2013 – 2015.

The aims were studying utilization of compost, bio-fertilizer, bio-extract associate
with chemical fertilizers causing of chemical properties transformation in the soil.
Growth, yield and economic return were investigated. The experimental design was
Randomized Complete Block Design (RCBD) with 8 treatments and 3 replications. The

results showed that utilization of compost (20 kg. per plant) with recommended
chemical fertilizer or 1/2 recommended chemical fertilizer (Tr 4, 6 and 8) gave
organic matter phosphorus potassium calcium and magnesium of 2.32 – 2.70 % ,

-1
-1
-1
1,943 – 2,001 mg. k , 235 – 296 mg. k , 3,131 – 3,488 mg. k and 574 – 690 mg. k -1
respectively higher than the experimental set of bio – fertilizer (5 kg. per plant) with
chemical fertilizer (Tr 3, 5 and 7) and recommended chemical fertilizer (Tr 2). During
5 month of papaya growth, Tr 6 compost (20 kg. per plant) with recommended

chemical fertilizer had plant height, canopy radius and girth higher than other
treatments. However, the utilization of Tr 5 bio-fertilizer (5 kg. per plant) with
recommended chemical fertilizer had the highest growth yield as 5,097 kg. per rai, the
highest economic return and the lowest cost production. The results of economic return
and benefit costs ratio were 54,773 baht per rai and 3.56 respectively.