Vol. 69 No: 5

Title:
Fruit Set and the Effective Pollination Period in Red Currant as Affected by Nitrogen Fertilization and Exposure to Red Light

Authors:
J. TROMP, K.A. VISSER and J. DIJKSTRA

pp: 791-798

Abstract:
In three experiments in plastic tunnels, the effect of nitrogen fertilization, exposure to red light and flower removal was evaluated on the fruit set of red currant (cvs Jonkheer van Tets, Red Lake and Rolan). In addition, the effective pollination period (EPP) was determined. Nitrogen fertilization had no effect or only minor effects on fruit set, berry weight and seed number per berry. Exposure to red light was also uneffective. Removing the terminal five flowers of a truss enhanced fruit set, but berry weight was not affected. The EPP was only 2–4 d. When pollination was delayed to 6 d after flower opening, fruit set was the same as in the "no-pollination" control. Delay in pollination markedly reduced berry weight and seed number. Fruit set after self-pollination was high but berry weight and seed number were clearly lower than after cross-pollination. In an additional outdoor experiment, reducing light intensity by 50% had no effect on fruit set.

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