Feed quality of feed grassland agrophytocenoses depending on their species composition and fertilization in Precarpathian conditions

Abstract

Purpose. To establish quality indicators of forage (crude protein, protein, crude fat, crude fiber, BER, crude ash, macronutrients) of grassland agrophytocenoses depending on their species composition and fertilization in Precarpathian conditions. Methods. Observation, comparison, analysis and synthesis, field experimant. Results. Research results on fertilization influence of Trifolium pratense, Trifolium hybridum, Medicago sativa and Bromus inermis on the chemical composition and quality of plant mass are presented. It is established that perennial legumes were characterized by better mineral composition for cattle forage compared to the cereal grasses in all soil conditions. In variants without fertilization and under Р60К60, crude ash content increased by 0.9—1.1 in dry matter, in particular 9.2—9.5 % while in cereal grasses 8.3-8.4 %. In cereal grass stands formed by Bromus inermis, dry matter digestibility in feeds made up 53—54 %, while in legumes by 4—5 % less. Application of phosphorus and potassium fertilizers at the rate of Р60К60 and even Р90К90 did not significantly affected the content of digestible protein in feed units and content of exchangeable energy in dry weight. Conclusions. Based on the research, it is established that application of phosphorus and potassium fertilizers generally did not significantly affect mineral composition of feeds. In addition, an increase in phosphorus and potassium content in dry weight was observed. When Р60К60 was applied, phosphorus content in legume-cereal grass mixtures increased by 0.01—0.02 %, potassium – 0.05—0.08 %; and when Р90К90 was applied – by 0.02—0.03 and 0.07—0.12 % with LPD0.5 of 0.02 and 0.12 %, respectively On the cereal grass stand upon the using of phosphorus and potassium fertilizers was also visible trend to increasing of potassium in dry weight on 0,13 – 0,16 % (Р60К60 and Р90К90 respectively).