FIELD: agriculture.
SUBSTANCE: invention relates to the field of engineering biology and bioindication of environment. The method comprises taking leaves from the accounting trees. And for measurement each leaf is placed in front with the side facing the top of the shoot. From each leaf from the left and right sides the parameters of the width of left and right halves of the leaf are measured, mm, the length of the nerve of the second order, the second leaf from the bottom, mm, the distance between the bases of the first and the second nerves of the second order, mm, the distance between the ends of these nerves, mm, the angle between the main nerve and the second from the leaf base with the nerve of the second order, degrees. The accounting trees are taken at least three birches, from each birch at least five leaves of different sizes are taken from the side of each local evaluated area, and all at least 15 leaves are taken as the population of separate independent individuals. Next, a table of all the measurements is made without their averaging, the resulting sample is subjected by statistical modelling to factor analysis by detection of binary relations between the 10 factors, and all 100 biotechnical regularities are identified in the software environment by the formula of the form: 
where y is component or dependent quantitative factor (10 parameters on five indicators from two halves of the leaf); x is explanatory variable or influencing factor (the same 10 parameters on each leaf); a1-a8 are the model parameters obtained by identification on specific measurement data.
EFFECT: method enables to improve the accuracy of indication of the local environment quality surrounding the birch leaves, as well as to simplify and improve the performance of measurements of the parameters of the leaves.
4 cl, 23 dwg, 8 tbl
