Regularities of the spatial-temporal variability of the potato yield in Polissya and Forest-Steppe zones of Ukraine
DOI:
https://doi.org/10.31548/dopovidi2019.01.012Keywords:
yield, potato, trend, dynamics, spatial-temporal variability, modelAbstract
In the present article the patterns of the geographic variability in yields of potato within Polesia and Forets-teppe zones of Ukraine were established and the correlation of the factors and dynamics of the agro-economic and agroecological nature was determined. The yields dynamics of potato in the study area over time were determine as being characterized by three extreme points: two local maxima and one local minimum. Potato yield dynamics can be described and interpreted by characteristic points of the fourth degree polynomial. The absolute term of the polynomial equation indicates the productivity of the potato in the starting period. The starting level of potato yield varies from 1.71 t / ha (south-eastern regions) to 2.27 t / ha (northern areas). Dynamics of the productivity that can be explained by the regression indicates that agro-technological and agroecological conditions of agricultural production is a total factor that determines the presence of a general trend. The coefficient of determination of the regression of the total trend can be interpreted as an indicator of the role of the agro-technological and agro-economical factors in the yield dynamics. It was found out that the contribution of agro-technological and agro-economic factors in the total variability of potato yields is from 65 to 88%. The northern and central areas of the research region are the most sensitive to agro-technological and agro-economic factors and the western and eastern areas are the least sensitive.
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