INFLUENCE OF FERTILIZATION UPON FORAGE QUALITY ON A PERMANENT GRASSLAND OF AGROSTIS CAPILLARIS L. – FESTUCA RUBRA L.
B.V. Avarvarei, Elena-Liliana Chelariu
Increasing the productive potential of permanent grasslands and improve the quality of feed produced are issues of great importance, given the necessary assurance of green mass and feed hay for animals. In this purpose has been made in the period 2006-2008, research on a permanent grassland of Agrostis capillaris L. - Festuca rubra L. aiming at the influence of fertilization with mineral fertilizers, cattle manure and vinassa on the quality of obtained forage. Mono-factorials experiences were arranged as randomized blocks in four repetition method and fertilization was done with 15 graduations. In the first year of experience (2007) for fertilization with mineral fertilizers crude protein content of forage increased from 8.95% at control variant to 11.52% at N128P72 variant. Referring to cattle manure fertilization percentage of crude protein ranged from 10.38% (20 t cattle manure) to 10.47% (30 t cattle manure), while the administration of vinassa on phosphorus agro-fond it increased from 11.28% at 4 t/ha vinassa+P36 variant to 12.36% at variant fertilized with 7 t/ha vinassa+P108. In the next year of experience (2008) crude protein content at variants fertilized with nitrogen was higher compared with previous year (10.48% at N64 variant up to 11.78% at N128P72 variant) same trend is observed at vinassa fertilization (11.38% at 4 t/ha vinassa+P36 variant to 12.94% at fertilization with 7 t/ha vinassa+P108). Crude cellulose content, at variants fertilized with mineral fertilizers, was in 2007 by 25.48% at control variant, reaching 27.60% at variant N128P72, while in 2008 increased from 25.92% at control variant to 28.16% at N128P72 variant. The same increasing trend was recorded also at fertilization with manure and at application of different rates of vinassa. Finally the percentage of crude protein and crude cellulose recorded growth in the second year of experience, except that the increase of the percentage of crude protein was higher than the percentage increase in crude cellulose. The chemical composition of the forage was influenced by both kinds of fertilizers and used rates.
Key words: quality, forage, Agrostis capillaris L., Festuca rubra L., fertilization