Improvement of Sandy Soil by Organic and Chemical Fertilizers for Kopok Production   Seri Chaturangkakul, Somnuk Sritongchim and Yuwadee Buttrama   ABSTRACT         Improvement of Sandy soil (Nampong series) by organic and chemical fertilizer for Kopok was conducted at Borabue district, MahasaraKarm province in 1985 - 1991. The experiment design was RCB arrangement and 10 treatments used in this study were : control , applied with chemical fertilizer alone, stable manure 6, 12 kg/plant/yr alone, compost 6, 12 kg/plant/yr alone and also applied stable manure and compose at the rates of 6 and 12 kg/plant/yr with chemical fertilizer (15-15-15) to study the effect of stable manure and compose alone, stable manure and compose applied with chemical fertilizer to growth and yield of Kopok. The result revealed that plants were applied with stable manure or compose at the rate of 12 kg/plant/yr had a highest growth and yield compared to the others treatments. The data showed that Kopok had average height, girth and canopy of 5.95 cm, 98.88 cm and 5.30 meters respectively with the amount of pods was 462.49 pods and weight of fiber was 925.17 grams per plant after 6 years of the experiment         Keyword : Organic and Chemical Fertilizers, Kopok