Published in Scientific Papers. Series A. Agronomy, Vol. LXVII, Issue 1
Written by Antoniya STOYANOVA, Gancho GANCHEV
The research was conducted in the period 2022-2023 in the experimental field of the Department of Plant Breeding, Faculty of Agriculture of Trakia University, Stara Zagora, Bulgaria. In this study, the nutritional value of three maize hybrids was investigated. The productivity of hybrids grown in non-irrigated and irrigated conditions was determined. The influence of feeding with liquid foliar fertilizers on the productivity of corn hybrids has been studied. The chemical composition has been investigated and the nutritional value of the biomass has been determined. A regression analysis was performed between some parameters and trends were detected. The analysis of the results shows a tendency to-wards an increase in the crude protein content of the variants treated with nutritional products. An average increase of 36.4% for LG 31.390 and 14.8% for Knezha-461 was reported over the study period. When giving the hybrid, no signi- ficant differences were found in terms of the content of PFA. The data shows that the values of FUM and FUG move within narrow limits for the variants. A negative RDP was found, which is an indicator of nitrogen deficiency for mi-crobial protein synthesis in the rumen. Linear regression models show a strong relationship between crude protein content and biomass yield. The coefficients of determination were established for the two hybrids, LG 31.390, R2 = 0.9255 and Knezha-461, R2 = 0.7205, respectively.
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