Composição bromatológica da aveia branca (Avena sativa L.) cultivar IPR 126 em cultivo subsequente a soja e milho sob diferentes níveis de nitrogênio

Abstract

The southern region of Brazil has a subtropical climate and has a need for the winter season (period of senescence or death of tropical plants), forage of excellent quality, which can replace perennial tropical pastures, or be used in the sequence of annual crops. of summer cereals. Avena ssp. It is among the most used species for animal feed, due to its good adaptation to cold and high nutritional quality. The field work was carried out at the Universidade Federal do Paraná (UTFPR) – Campus Dois Vizinhos, in an experimental area consisting of four plots of 24m² (3m x 8m.), divided into four blocks, with spacing between plots of 0.5m, totaling an area of 192m², considering oats in succession to soy and corn. The species Avena sativa L., cultivar IPR 126, was evaluated in subsequent cultivation to corn and soybean, comparing the values of NDF, ADF and digestibility in the third forage cut. To standardize the plants, a cut was made approximately 10 cm from the ground, when they reached around 25 cm in height, and the other subsequent cuts were made every 21 days between one cut and another. Each plot was subdivided into an area of 6m² each and received doses of 0, 60, 120, 240 kg of N.ha-1. Bromatological analyzes were carried out in the Bromatology laboratory of UTFPR – Campus Dois Vizinhos and include analyzes of Insoluble Fiber in Neutral Detergent (NDF), Insoluble Fiber in Acid Detergent (ADF) and analysis of in vitro digestibility (IVD). A statistical difference was observed only between the succession areas (soybean; corn) and the different levels of nitrogen applied, in which, for the succession area to soybean, we obtained values of 53.10% and 48.65% for NDF and FDA, respectively, while for in vitro digestibility, the succession area to corn showed a significant value of 83.85%. As for nitrogen levels, there was a significant difference for 60 and 120 Kg of N/ha when compared to the other levels, for NDF and ADF, and for digestibility, the best result was for the level of 240 Kg of N/ha. The highest level promoted greater performance of microorganisms in tissue digestion, due to the association between carbohydrate and protein offered in the rumen. With regard to the succession area, soybeans are naturally N2-fixers, which allowed the supply of nitrogen to the root of the plant and its greater development, with greater cell wall production.