Mineral composition of feed mass of the meadow clover different varieties depending on the elements of growing technology

Abstract

Purpose. To establish changes in the level of accumulation of raw ash, macro- and microelements, heavy metals and nitrates in dry feed biomass of different varieties of meadow clover depending on the elements of the growing technology in the Right Bank Forest-Steppe natural zone of Ukraine. Methods. Field and laboratory – for field and laboratory research, analytical – to determine mineral composition of dry meadow clover biomass. Results. Dry fodder mass of different varieties of clover under different elements of cultivation technology accumulated raw ash in the range of 8.5-8.9%, including macroelements (phosphorus – 0.32-0.37%, potassium – 2.21-2.52%, calcium – 0.49-0.58%, magnesium – 0.16-0.19%), nitrate nitrogen (N–NO3) – 0,02-0,05%, microelements (zinc – 13.7-14.8 mg/kg, copper – 3.5-4.9 mg/kg, manganese – 44.0-48.3 mg/kg and iron – 64.4-68.8 mg/kg) and heavy metals (lead – 1.8-1.9 mg/kg, nickel – 1.8-1.9 and cadmium – 0.2-0.3 mg/kg). Relation of dry matter content of potassium to the sum of calcium and magnesium content was in the range of 3.0-3.9 and calcium to phosphorus – 1.4-1.8. Conclusions. The content in the dry fodder mass of meadow clover of the studied macro- and microelements and their ratio did not exceed the zootechnical norms for feeding cattle. The method of sowing meadow clover did not significantly affect the accumulation of these mineral elements. Dry mass of the Lybid variety accumulated a little more potassium, and calcium and manganese were accumulated by the Typhoon variety. For the application of mineral fertilizers in doses Р60K90 and N60P60K90 compared to the variant where only inoculation of seeds with nodule bacteria was carried out an increase of crude ash, phosphorus, potassium in the dry matter content was observed. For the introduction of nitrogen at a dose of N60 without exceeding the maximum allowable concentrations, there was a slight increase in the content of nitrate nitrogen, as well as zinc, copper and manganese.