Effect of the Thinning of Ovaries on the Stem on the Growth and Productivity of Greenhouse Cucumbers

P. DIMITROV and M. MIHOV
Institute of Horticulture and Canning, BG-4003 Plovdiv, Bulgaria

Abstract

DIMITROV, P. and M. MIHOV, 2001. Effect of the thinning of ovaries on the stem on the growth and productivity of greenhouse cucumbers. Bulg. J. Agric. Sci., 7: 303-308

The investigations were performed in the period March-June with cucumber variety Sandra in glasshouse at the Institute of Horticilture and Canning, Plovdiv.
It is established that the increasing of the main stem loading with fruits in cucumbers results in intensifying of the competition between the vegetative and reproductive organs for nutrient substances as a result of which the vegetative growth delays and inhibits development of secondary and following class branches. As a result of this the number and weight of the fruits, formed on the branches decreased and the part of the non-standard produce increases.
Regressive equations of y = ax2 + bx + c = 0 type, describing the variations in fruit number and weight in dependence of the main stem loading with fruits, are established with adequate accuracy.
In the specific microclimatic conditions, treatment with 7 ovaries on the main stem permits the most balanced distribution of the nutrient substances for feeding of maximum number of fruits on the plant as this did not reflect significantly on their growth and quality.

Key words: greenhouse cucumbers, growth, productivity