砂丘地のぶどう樹に対するスプリンクラー灌水について

This investigation was designed to know the effects of sprinkler irrigation on 5 years old grape vines (Var. koshu) at Zinzai sandy hill region, Shimane prefecture.
Grape vines were devided into three plots and irrigated by following methods respectively ; By sprinkler over the trellis, By sprinkler under the trellis and By hoses directly on the field.
The results obtained are summarized as follows ;
1) . The growth of current shoot in each plots was scarcely different.
2) . Grapes irrigated directly on the field by hoses produced better fruit in quality by increasing the concentration of colour and sugar content, and lowering the acidity. But grapes irrigated by sprinkler over the trellis produced weighter and longer clusters than the others.
3) . The occurence of Black Pox Disease (Elsinoe ampelina (De Bary) Shear) on leaves was significantly different between three irrigation treatments at 0.1% level of probability from July Ist to August 15th, and grape vines irrigated by sprinkler over the trellis suffered most seriously in all.
4) . With irrigation by sprinkler over the trellis, leaf temperature became low nearly 4℃ on fine day in August.