@article{oai:soar-ir.repo.nii.ac.jp:00010774, author = {建石, 繁明 and 熊代, 克巳}, issue = {2}, journal = {信州大学農学部紀要}, month = {Dec}, note = {Trees of Fuji apple, Nijisseiki pear and Okubo peach were planted in large-sized concrete pots with phosphorous deficient soil originated from volcanic ash, and the effect of phosphate application on the tree growth, the yield and the fruit quality of them and the phosphoric acid content in soil by various analytical methods were investigated. The results obtained were summarized as follows: 1. The growth, the flower bud formation and the yield of trees which applied no phosphate were very poor in the all species. They were remarkably promoted by the light application of phosphate which was equivalent to 2.5 percent of absorption coefficient of phosphoric acid of the soil, but they were not promoted by the further application of phosphate. 2. The acid content of fruit juice was decreased slightly with an increase of phosphate application in the all species, but the fruit firmness and the percent of soluble solids in juice were little affected by phosphate application. 3. The phosphorous content of leaves increased markedly by the little application of phosphate, but it was increased slightly by the further application in the all species. 4. The contents of phosphoric acid of eight types in soil by the different analytical methods were increased with an increased application of phosphate without exception. But the degree of increase was different with the type. The absorption coefficient of phosphoric acid was decreased slightly with an increased application of phosphate. 5. There were positive high correlations between the tree growth, the flower bud formation and the yield and the contents of phosphoric acid of any types in soil. The correlation with the content of Al-type phosphoric acid was the highest among them. 6. On the assumption that the content of Al-type phosphoric acid in soil wasoptimal at the plot of the light phosphate application, from the content of Al-type phosphoric acid in soil, a generalized formula for calculating of optimal amount of phosphate application to the soil was proposed., Article, 信州大学農学部紀要 17(2): 101-116(1980)}, pages = {101--116}, title = {各種分析法による土壌中のリン酸含量とリンゴ,ナシ及びモモ樹の生育,収量及び果実品質との関係}, volume = {17}, year = {1980} }