Optimizing the Models for Calculation of Sunflower Leaf Area II. Relations between Leaf Area and Leaf Dimensions and Optimizing the Equalizing Coefficient KI. I. ILIEV and T. K. TONEV

Institute for Wheat and Sunflower "Dobroudja", BG-9520 General Toshevo, Bulgaria

AbstractILIEV , I. I. and T. K. TONEV, 2000. Optimizing the models for calculation of sunflower leaf area II. Relations between leaf area and leaf dimensions and optimizing the equalizing coefficient K.

Bulg. J. Agric. Sci., 6: 399-404Relations between leaf area and leaf dimensions of two cultivars and two hybrids of sunflower were studied. It was found out that maximum accuracy of leaf area calculation can be achieved by using a product of two leaf dimensions, one of which is the length of main nerve. The most suitable formula for calculating the leaf area of the object of study is length by width by 0.679. Depending on the genotype, the phase and the level, a relative error of ±20¸22% can be addmitted in calculating leaf area. The coefficient in the formula for leaf area calculation has to be determined for every cultivar or hybrid.

Key words:sunflower leaf area, leaf dimensions equalizing coefficient K, models for calculation