Abstract
In the district of Seto Inland Sea, most of virgin soils derived from granite are deficient in phosphorus. This experiment was conducted with grape vines to observe the effects of phosphorus application on these soils.
1. Rooted cuttings of Campbell Early, Muscat Bailey A, Neo-Muscat and Delaware planted in pots with these soils, did not grow well without phosphorus application. The similar trend was also found with rooted cuttings of rootstocks such as Teleki 8B, 3306, 3309, 420-A and Hybrid Franc, though it was not so marked in Hybrid Franc as in other rootstocks.
2. When one-year-old potted Delaware grapes grafted on various kinds of rootstocks were not applied with phosphorus fertilizer, their growth decreased greatly with decreased phosphorus content of a vine based on unit dry matter. However, the former was not necessarily coincided with the latter in the order. A decrease in growth was most remarkable on Teleki 8B and the least on Hybrid Franc.
