The paper presents the results of three - year tests (I, II, III) of finishing alfalfa seed of three different purities. Natural alfalfa seeds were classified into three groups: 1) without the presence of quarantine weeds; 2) with the presence of quarantine weeds of Cuscuta spp. and Rumex spp., but in smaller quantities; 3) in which there were also quarantine weeds in larger quantities. The alfalfa seeds were cleaned on a selector with sieves and on a magnetic separator manufactured by Emceka-Gompper. Depending on the purity of natural alfalfa seed, the finishing process had to take place in one to three passes through a system of machines, which caused different finishing output and losses of finishing processed alfalfa seed (9.2 to 38.0%). After finishing, the highest quality of processed seeds was from the group with the highest quarantine weeds (group 3), which was reflected in the lowest percentage of hard seeds (16%) and the highest percentage of germination (83%) in all years. This is also shown by a highly significant negative correlation between germination and hard seed (r=-430) after three years of seed processing.
The growth and metabolism of plants, especially on acidic soils, largely depend on the concentration of cobalt (Co) in the soil, i.e. the rhizosphere. An optimal supply of cobalt is essential for N2 fixation of Rhizobium bacteria that are in symbiotic relationships with leguminous plants, influencing their better growth and supplying them with nitrogen. When there is a lack of Co in the plant, the organic production of legumes falls. Indirectly or directly, Co also affects other metabolic processes in plants. The aim of the work was to analyze the importance of optimal provision of forage legumes with cobalt for obtaining high and quality yields of forage and seeds.
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