2-2 Soil

The type of soil also affects the growth of Kyoho Grape. In Changhua's vineyards, the soil is mainly loam to clay loam, with a pH value of about 6.0-7.5. This type of soil has a strong ability to retain fertilizer, but it needs to be supplemented with micronutrientssuch as iron and zinc.

On the other hand, most of the vineyards in Hsinyi, Nantou are gravelly soils with good drainage capacity but poor water retention, requiring drip irrigation to maintain moisture. In addition, sandy soil loses nitrogen fertilizer more quickly, so the frequency of fertilizer application has to be increased and slow- release fertilizers have to be used. To improve the soil, it needs to be plowed every three years and silicate slag is applied to raise the pH and silica content of the soil, which will make the grapes healthier and reduce the problem of pests and diseases.