@article{oai:soar-ir.repo.nii.ac.jp:00010794, author = {建石, 繁明 and 熊代, 克巳}, issue = {1}, journal = {信州大学農学部紀要}, month = {Jun}, note = {Trees of Jonathan apple, Nijisseiki pear, Okubo peach and Delawere grape wereplanted in large-sized pots with phosphorous deficient soil originated from volcanicash, and the effect of phosphate application on the tree growth, the yield and the fruit quality of them were investigated. The results obtained were summarized as follows 1. The growth of trees which applied no phosphate was very poor, and the symptoms of phosphorous deficiency appeared in the late season of growth. 2. The tree growth of Jonathan, Nijisseiki and Okubo was strikingly promoted by the light application of phosphate which was equivalent to 2.5 percent of absorption coefficient of phosphoric acid of the soil, but it was promoted slightly by the further application of phosphate. On the other hand, the tree growth of Delawere was promoted proportionally to the further application. 3. The formation of flower buds was remarkably promoted with an increased application of phosphate in the all species. 4. Jonathan, Nijisseiki and Delawere which applied no phosphate yielded no fruit, and Okubo which applied no phosphate yielded much poorly. The yield increased with an increase of phosphate application in the all species. 5. The fruit quality of Delawere was markedly improved with an increased application of phosphate. The firmness and the content of acids decreased, but the ratio of soluble solids to acids increased with an increase of phosphate application in the all species. 6. Phosphorous content of leaves increased markedly with an increase of phosphate application in the all species. Nitrogen content in Nijisseiki, Okubo and potassium content in Nijisseiki decreased, but calcium content in Nijisseiki, Delawere and magnesium content in Jonathan, Okubo increased with an increase of phosphate application. 7. Available phosphoric acid in the soil increased considerably and the absorption coefficient of phosphoric acid of the soil decreased slightly with an increase of phosphate application., Article, 信州大学農学部紀要 14(1): 1-12(1977)}, pages = {1--12}, title = {火山灰土壌に生育するリンゴ,ナシ,モモおよびブドウの生育,収量および果実品質に及ぼすリン酸の肥効}, volume = {14}, year = {1977} }