Muskmelon cv. ‘Earl′s Favourite’ was grown using two kinds of bed soil (sub-soil of Ando soil, and Alluvial soil). Various amounts of bed soil (10, 15, 20 and 25kg per plant) were used to study the effect on growth and fruit quality in a plastic house. The results were as follows:1. In the early stages plant growth in the plot using Ando sub-soil was inferior to that using alluvial soil, but this difference was minimized in the later stages. Plant growth was generally greater with increasing amounts of bed soil.2. The external appearance, color and formation of surface netting of the fruits were more prominent in the plots using more than 15kg Ando sub-soil and more than 20kg alluvial soil.3. There was no difference between the two soils in soluble solids, sucrose and fructose contents of fruits, but glucose content grown on Ando sub-soil was higher than that on alluvial soil. Total suger was the highest in the alluvial soil 25kg plot and in the Ando sub-soil 20kg.4. The citric acid content of fruits increased with increasing amounts of bed soil used. However, citric acid content was lower in fruits grown on Ando sub-soil than on alluvial soil.5. The soluble pectic acid calcium content of fruits grown on Ando sub-soil was slightly higher than that on alluvial soil. Little difference was found in this content among the plots using various amounts of bed soil in either soil.6. The taste of fruits grown on Ando sub-soil was slightly inferior to that on alluvial soil. In both soils the fruit taste in the plots of 10kg bed soil was inferior to that in the plots of 15 and 20kg bed soils.7. The phosphorus content in all plant tissues grown on Ando sub-soil was lower than that grown on alluvial soil, whereas contents of potassium, calcium and magnesium were higher in that grown on alluvial soil. With increasing bed soil amounts, potassium, calcium and magnesium contents increased in both soils.8. From the results mentioned above, it was recognized that Ando sub-soil can be utilized as bed soil to produce fruits with high quality, if adequate amounts (15_??_20kg) of Ando sub-soil are used.