The influence of the volume of invitro-rooted microplants of the forest crops (birch and aspen) production in the range from a few hundred to a few tens of thousands on the cost and efficiency of the production has been studied. A wide range of genotypes of aspen and birch has been studied, 15 genotypes for each of the families. The influence of the volume of produced goods on the cost and efficiency of the microplants obtained during the multiplication stage has been well established. The equations, reflecting the theoretical relationship between the volume of production of the rooted microplants and their cost, have been calculated. Theoretical calculations using regression equations has allowed to establish the degree of influence of the batch volume in the range from 1 000 to 100 000 units. It turned out to be such that for a tenfold increase in the volume of production the cost of microplants of the Birch increases per 8,66 roubles and one plant of the Aspen increases per 3.14 roubles, which reflects the effect of the genotype on the level of genus of the propagated plant. It has been found that the linear dependence of the equation cannot fully describe the impact of the volume of produced microplants and the regularities observed under the regular occurence. Along with that, the graph of the power function has turned out to be closer to the objectively observable results. The degree of dependence has made it possible to predict that the cost price of the Birch under the adopted technology can overcome the level of 10.00 roubles with an increase in the production volume of more than 111 260 microplants. For the Aspen such level of cost price may be chieved at the level of production of at least 560,850 units of microplants. One of the reasons that influenced the reduction in the cost price and which has been discovered in the experiment appeared to be more effective use of plants resulting from the multiplication stage.

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