Agricultural Academy, Research Institute of Mountain Stockbreeding and Agriculture, 5600 Troyan, Bulgaria
Bozhanska, T. (2019).Study on the influence of Lumbrical and Lumbrex bio-fertilizers over an artificial grassland of red fescue (Festuca rubra L.). Bulgarian Journal of Agricultural Science, 25(2), 278–282
In the period 2014-2016, a field experiment was conducted to establish the influence of the Lumbrical (150 and 200 ml/m2) and Lumbrex (150 and 200 ml/da) on the yield, height and chemical composition of red fescue grassland. The preparations included in the experiment have a positive effect on the productivity of red fescue. During the study period, the soil treatment of the plants increased the yield of grass crops to a higher extent compared to the foliar. The amount of fresh and dry mass in the variant with Lumbrical 150 ml/m2 exceeded significantly the non-treated control by 34.5 and 37.0% (P < 0.01). In the grasslands with Lumbrical 200 ml/m2, the values were 24.9% (fresh mass) and 30.2% (dry mass) higher than the control (P < 0.05). The treatment with Lumbrical and Lumbrex increased the height of the grassland of Festuca rubra L. The influence of Lumbrical bio-fertilizer at a dose of 200 ml/m2 increased the average stem length by 14.9% in comparison with the control. Crude protein content in grasslands with soil and leaf bio-fertilization exceeded the control variant by 11.9% (Lumbrex 150 ml/da) to 20.8% (Lumbrical 150 ml/m2). Mineral, phosphorus and crude fat content in the variants with Lumbrical 200 ml/m2 is higher with 14.7%, 16.7% and 17.3% respectively, in comparison with the non-treated control. The introduction of the granulated fraction (200 ml/m2) reduced the fiber concentration of the grassland by 7.5%.