Published in Scientific Papers. Series A. Agronomy, Vol. LXIII, Issue 2
Written by Velika KUNEVA, Atanas SEVOV
The objective of the present study is by means of a mathematical approach (variance, regression and variation analysis) to estimate the yield itself and to determine the row spacing influence on yield. Data analysis and mathematical processing, obtained during the study period (2016-2018), showed that the tested alfalfa varieties produced the best results at standard row spacing of 12.5 cm, regardless the used seed rate. The dispersion analysis of green mass and hay yields registered that the influence in the first year was the strongest (η = 96). In the second and third years, the variety had stronger influence on the yield (η = 95 and η = 99). The strongest factor correlation was the one between variety and row spacing (η = 89; η = 91; η = 94), which confirmed the fact that varieties react differently and have different compensatory capacity with the row spacing increase. The linear regression model between hay yield and total green mass yield for both varieties (Multifolium 1 and Legend) showed a high degree of correlation.
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