Abstract. In the experimental field of RIMSA-Troyan was studied the herbicidal effect of Aramo 45 (45 g/L Tepraloxydim) at doses of 1 and 2 L/ha, and Dual Gold 960 EC (960g/L smetolachlor)-2 and 3 L/ha, during the period of 2013-2015 on light grey pseudopodzolic soil, over the weed infestation level and productivity of bird's-foot-trefoil. It was found that both herbicides in both doses showed good selectivity in relation to bird's-foot trefoil. Most pronounced was the effect by the applied herbicides regarding the degree of weed infestation in the year of sowing, as the treatment by Aramo 45 at a dose of 2 L/ha and Dual Gold 960 EC at a dose of 2 L/ha provided a degree of weed infestation of 6.68 and 16.11 %. The vegetation treatment of a grassland of bird'sfoot-trefoil by Aramo 45 herbicide at a dose of 1 and 2 L/ha led to an increase in dry matter yield with 21.85 and 18.21 %, and with Dual Gold 960 EC EK it was 24.28 and 30.29 %. Dual Gold 960 EC showed a greater effect from both tested herbicides over the dry matter yield, applied at a dose of 3 l/ha at a phase of 2-4 leaf stage of bird's-foot trefoil. That herbicide could be recommended for the application in the practice in creating weed-free crops of bird's-foot-trefoil for forage production.
The chemical composition of following bird's foot-trefoil cultivars was evaluated: 'Bright', 'Georgia 1' (USA), 'Nueltin' (USA), 'Witt', 'Pardee' (USA), 'Roseau' (USA), 'Steadfast', 'Trevig' (USA), harvested in the experimental field of RIMSA-Troyan during the period of 2010/2012. The indicators for crude protein, crude fat, crude fiber, nitrogen-free extractable substances (NFE), calcium and phosphorus were followed. The correlation dependences among them, the yield and morphological composition of grassland were calculated. After their statistical processing and comparative assessment was found the variability among cultivars according to undergrowths. Very low variability (VC) was registered regarding the content of crude protein (6.51 and 8.44), crude fiber (3.38 and 5.58), nitrogen-free extractable substances (5.02 and 3.46), ash (5.06 and 2.69) and it was low for calcium (10.97 and 7.99) and phosphorus (5.52 and 12.53). Genotypes of 'Trevig' and 'Pardee' cultivars were outlined as the most perspective for use in the selection programmes and for introduction in production under specific soil and climate conditions. 'Trevig' cultivar especially distinguished itself as it combined high content of protein (179.0 and 210.9 g kg-1) and low content of crude fiber (268.7 and 277.3 g kg-1). The strong positive correlation between content of crude protein and the relative share of leaves in the grassland (r=0,796); the content of crude fiber and height of plants (r=0,605); generative organs and content of calcium (r=0,597), which were found, showed that these features were interrelated.
Abstract. During the period of 2010-2012 at the experimental field of RIMSA-Troyan was studied the independent effect of the following biofertilizers: phosphorus humate (3000 l/ha), boron humate (1000 l/ha) and molybdenum humate (1000 l/ha) and the combination (phosphorus humate 2500l/ha + boron humate 1000 l/ha + molybdenum humate 1000 l/ha) on the chemical composition and the energy nutritional value of forage of birdsfoot trefoil. It was found out that the use of preparations increased the content of raw protein in the forage with the values from 4.39 to 16.56%, as the most effective was the effect of boron humate. After the independent application of phosphorus humate, as well as its combination with boron and molybdenum humate, the crude fiber were with the lowest values, and boron and molybdenum increased their content by 8.57 and 5.88%. Raw fats had the highest content after treatment by boron humate (4.79% over the control) and NFE by phosphorus humate (4.24% over the control). The highest positive effect over the food units of milk (FUM) and growth (FUG) showed the treatment of birdsfoot trefoil by boron humate, as a result of which FUM exceeded the control by 8.84%, and FUG by 12.84%. Fertilization by biofertilizers contributed to obtain forage of birdsfoot trefoil close to its organic growing.
The study was conducted during the period of 2010-2012 in the experimental field of RIMSA-Troyan on light grey pseudopodsolic soil. The aim of study is to determine the efficiency of herbicides Stratos Ultra (100 g/l cycloxydim) and Pulsar 40 (40 g/l imazamox) and their use in seed production of birdsfoot trefoil. The highest efficiency against weeds showed the treatment of birdsfoot trefoil crops with herbicide Pulsar 40 at a dose of 1200 ml/ha, applied in the year of sowing at the phase of 2-4 leaf of birdsfoot trefoil. The herbicide treatment restricted the opportunity to increase the population density of weeds and led to increase in seed yield by 30.2%. The high seed production under treatment with that herbicide determined also the high values of the structured elements of seed production. In the treatment by herbicide Stratos Ultra high seed production was also realised, which exceeded the control by 8.7% at a dose of 1000 ml/ha and 11.7% at a dose of 2000 ml/ha.
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