The Interaction of Resistant Rootstock to the Nitrogen, Weed Control, Pruning and Thinning Effects on the Productivity of Concord Grapevines1
Year: 1969
Type: article
Abstract: This reports a 1960-1964 study of the responses of ‘Concord’ grapevines, own-rooted as well as grafted on the phylloxera resistant rootstock ‘Couderc 3309’, to pruning severity, thinning of fruit, N fertilization and weed control in a factorial experiment at Fredonia, New York. Although phylloxera were present, moderate size of vine and large yield were attained with own-rooted vines. Here, ‘3309’ rootstock did not have a unique effect on ‘Concord’. As an initial response, in 1960, when the range in vine size was 1.8 to 3.0 lb. of cane prunings per vine, increases in vine size were associated with increased yield because fruitfulness was not then seriously depressed by the vine size increasing treatments of ‘3009’ rootstock, cultivation, and N fertilization. As an equilibrium response in 1963-1964, in the range in vine size of 1.9-4.9 lb. of cane prunings per vine, when vine size was above 3.5 lb. of cane prunings, the decline in fruitfulness prevented a gain in yield, and there was either no increase or a decrease in fruit maturity. A 1966 sequel, affording 8’ and 16’ of canopy length for each 8’ spaced vine, showed fruitfulness to be closely associated with node number per unit length of canopy. Where the canopy length is fixed, crowding was likely the basis for the declines in fruitfulness which accompanied increases in vine size and node number. The effect of the resistant rootstock ‘3309’ was similar to that of the other vine-size increasing treatments in that it decreased fruitfulness and fruit maturity and had a small effect on yield and on soluble solids/vine.
Authors: Nelson Shaulis, Robert G. D. Steel
Institution: North Carolina State University
Language: English
Subfield: Plant Science
Domain: Life Sciences
SDG: Zero hunger
Open Access status: hybrid
Estimated APC paid: $3,500
OpenAlex ID: W4300183983