Cyclical manner of vegetable production industry; the efficiency of greenhouse business
Economical efficiency of agricultural industry is a major characteristic of the level of development of an enterprise. A profit from product sale depends on volume and structure of product sales, self-cost as well as the level of sales price. Thus, the gross revenue from cultivated crops and vegetable cultivars can be observed at the time of fruit harvesting. The total sum of the gross earnings from the harvest, determining the efficiency of enterprise can be calculated as a product of values of daily price and mass of total harvest. There are no challenging points in the condition of permanent price and vegetable harvest. Even the registration of average-sales prices for vegetable doesn't make the production difficult. But real market situation essentially differs from accepted practice to register average-sales prices with relatively permanent vegetable harvest. The price indexes of sales for tomato and cucumber produced in greenhouse in Udmurt Republic with showing the dynamic of retail price for vegetables were presented in the article. It was shown that prices of tomatoes and cucumbers had the seasonal factor that meant weekly price wavering. The temporal row harvest of cucumber ‘Tseres F<sub>1</sub>' and tomato ‘Admiro F<sub>1</sub>' produced at Zaviyalovskiy greenhouse enterprise was described. The average derivation between nearest and last harvest was in the gap 23% to 29% in cucumber and reached up to 70% in tomato. The values of such derivations were occasionally provoked and determined by some inter-enterprise factors. The construction of trend lines for such series and further line evaluation with the aid of determination coefficient R<sup>2</sup> showed extremely low quality of model of the kind y=a*x+b. The value of R cubic polynominals was in the limits R<sup>2</sup>=0.32-0.46. Essentially, plans for vegetable production, constructed on the basis of this linear model should be regarded as unsatisfied. According to the analysis presented above, it is worth concluding that the principles to plan the production process in greenhouse enterprises have to be changed. As an example, the use of tk value as a shift of harvest time for k-crop related to price maximum for the crop used can be very effective.