PHENOLOGICAL DEVELOPMENT OF TYPICAL BULGARIAN PEPPER VARIETIES DEPENDING ON AGRO-METEOROLOGICAL CONDITIONS

The goal of the present study was to establish the influence of different climate conditions during the five-years period on the phenological development of traditional pepper varieties. The experiment was carried out in Agricultural University-Plovdiv with three Bulgarian varieties, widely applied in practice - Kurtovska kapia 1619, Bulgarski rotund and Tchorbadzhijski that belong to different ser. var. and varieties of species Capsicum annum L. The mass development in 70% of the appearance of the following phenological stage as sprouting, flower buds, flowering, fruit sets and fruiting were established. The average daily temperature, total active temperature sum, maximal and minimal temperature, rainfall, relative humidity and the hydrothermal coefficient of vegetation period were calculated. The relations between phenological behaviours and elements of climatic conditions were determined. The correlation between average daily temperature total active temperature sum from one hand and periods between different stages of development, from another, was calculated. The regressions analysis between the duration of different phenophases and total active temperature sum were also done. The significance of the environmental conditions on the phenological development, especially for the stage as flower buds and flowering was established.