PRODUCTIVITY PER LEAF AREA IN SOME INTRODUCED STRAWBERRY VARIETIES IN THE SKOPJE REGION

Abstract

The study presents the results of the investigation on productivity per leaf area of fifteen strawberry varieties: Idea, Camarosa, Belrubi, Evita, Honeoye, Tethis, Chandler, Onda, Miranda, Paros, Elsanta, Eris, Madeleine, Favette and Marmolada, as well as two standard varieties: Pocahontas and Senga Sengana. The experimental orchard was performed on open field in the Institute of Agriculture – Skopje, on black polyethylene foil in form of double file set on banks and at the distance of 40x30cm between the plants, irrigated by control drip irrigation system. The study has been conducted on fruit number, fruitage and yield of soluble solid matter per unit of leaf area. Also, the effective leaf area for production of 100 number of fruits, for 1 kg of fruitage and for 100 g yield of soluble solid metter in fruis of each variety were examined. The investigated parameters related to productivity per unit of leaf area are ranged from 54,0 at Miranda to 125,1 at Pocahontas for number of fruits, from 0,49 kg/m² in Favette and Elsanta, to 0,96 kg/m² in Honeoye for fruitage and from 41,2 g/m² in
Elsanta, to 92,9 g/m² in Pocahontas for the yield of soluble solid metter in fruits. Leaf area of 1,37 m² is effective for 100 number of fruits production, as well as 1,47 m² for 1kg of fruitage and 1,75 m² for production of 100 g soluble dry matter fruits-yield. The productivity per leaf area of the investigated varieties is less dependent on the influence of leaf area per plant and fruit mass , but it is more dependent of the influence of number of fruits per plant, fuitage per plant and yeld of soluble solid matter per plant. The values of correlation coefficient between productive parameters per plant and effective leaf area parameters are with similar strength, but they are with an opposite dependencyin relation to the corresponding correlations with productive parameters per leaf area.