抄録
In order to find out profitable varieties for Japanese condition, the authors have introduced several Europian grape varieties from abroad since 1956: from Germany, Switzerland, Spain, France, Italy, Rumania, and the United States of America.
The cultural experiments were carried out outdoors, and vines were grafted on Teleki 5BB.
The experimental field conditions were: 1600mm rainfall in a year, 13°C in mean temperature, loamy soil of volcanic ash, and pH 5.6-4.0. The field is located in the suburbs of Tokyo.
Among many introduced varieties five early maturing varieties are recommended by the authors as wine or table grapes:
1) Malvasia nera di Piemonte (for wine and table grapes)
2) Regina (for table grapes)
3) Perla di Csava (for table grapes)
4) Primus (for table grapes)
5) Termidro (for table grapes)
Under the experimental conditions, care must be taken in managements for cultivation such as cane pruning, and much amounts of calcium, phosphorous, potassium, and less of nitrogen should be applied.
Chemical analyses of berries were made on the sugar total acid, amino nitrogen, and total nitrogen contents.
Sugar contents were: 18.2% in Perla di Csava, 17.7% in Primus, 17.1% in Regina, 16.4% in Malvasia nera di Piemonte, and 15.2% in Termidro, whereas the control variety“Delaware”has shown 19.7% under the same cultural conditions.“Malvasia nera di Piemonte”variety seemed to be promising for mechanical cultivation in Japan.
