ブドウ ノ セイイク ナラビニ カジツ ノ シュウリョウ ヒンシツ ニ オヨボス チッソ ヒリョウ ノ ブンセ コウカ ト ドセイ トノ カンケイ
Effects of Split Application of Nitrogen Fertilizer on Vine Growth, Yield and Quality of Delaware Grapes in Relation to Soil Properties
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Using 3-year-old fruiting Delaware grapes planted in pots with sandy and clayey soil, respectively, experiments were conducted to examine the effects of split application of a given amount of nitrogen fertilizer on vine growth, bunch yield and quality.
1. In sandy soil, vine growth increased and bunch yield markedly decreased with the increasing time of nitrogen fertilization from 3 to 12. Particulary, berry number per bunch which had the high conection with bunch yield was detrimentally affected by the increasing time of application.
2. In clayey soil, 6 times-application resulted in the best vine growth, though bunch yield tended to be a little higher with the increasing time up to 12.
3. In both soils, bunch quality based on soluble solids content and skin color became inferior in proportion to the fertilizer timing, accompanied by an increase in per cent foliar nirogen at both the stages of flowering and harvest.
The Shimane Agricultural College
Departmental Bulletin Paper
Faculty of Life and Environmental Science
開学十五周年記念号（Commemoration Issue for the 15th Aniversary）