Effects of the application of several kinds of organic materials on the vineyard were observed in the sand dune region. Equal amounts of rice straw, barnyard manure and green manure on the dry weight basis were given deeply in the soil respectively early in the spring of 1958, 1959 and 1960. Results obtained are as follows :
1. All of the treatments were superior to the check (non-treatment) concerning the shoot growth, yield and fruit quality (color and sugar content). No marked differences were found between the treatments of rice straw and barnyard manure. Shoot growth in the green manure treatment was the best, though it continued until late in the fall and the yield and quality of the fruit were somewhat inferior.
2. Green manure contained the most abundant nutrient elements. Therefore this treatment was supplied nutrient elements to the soil most abundantly, followed by the barnyard treatment and the rice straw treatment. However, according to the results of leaf analysis in June and July, nutrient contents of leaf coincided with the amount of application only as to nitrogen and potassium.
3. Other properties of the soil such as organic matter content (loss of ignition), water holding capacity, soil reaction, specific gravity and exchangeable capacity were also investigated. None of them however, had close relationship to the shoot growth yield and fruit quality.
4. Consequently, differences of the shoot growth, yield and fruit quality among the treatments might be attributed to a difference of an additional amount of nutrient elements, especially nitrogen and potassium due to the application of organic material to each treatment.