Published in Scientific Papers. Series A. Agronomy, Vol. LXVI, Issue 1
Written by Biser BOZHANSKI, Minko ILIEV, Magdalena PETKOVA, Tatyana BOZHANSKA
It was found that the dry mass of grasslands with organic fertilizing was by 2.0% higher in vitro digestibility of dry matter, higher content of CP (by 0.1%), CFr (by 1.7%) and N (by 0.1%), and a lower concentration of cellulose (by 0.3%) compared with of the mineral fertilizing variants, which led to a more in the concentration of NFE (by 1.2%), NDF (by 2.9%), hemicellulose (by 2.8%), Ca (by 0.3%) and P (0.2%). The energy nutritional value of fodder with of the mineral fertilizing of exceeded that of control with 0.4-2.8% and at оrganic fertilizing with 0.5-0.8%. A high correlation was found between the nitrogen content and CP (r = 1.0) of the grasslands with mineral fertilizing. The theoretical regression line and the equation of the regression dependence between the values of the indicators show y = 7.2224x -0.4841 at a high coefficient of determination (R2 = 0.9988). For the variants with manure, the concentration of CP registered proven correlation (r = 1.0) and regression dependence with the nitrogen content: y = 6.9861x - 0.0815 at R2 = 0.9999 (P<0.05).
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