Características estruturais e bromatológicas de azevém diplóide e tetraplóide submetidos a diferentes alturas de corte

Abstract

Ryegrass is an annual winter forage grass, widely used in temperate and subtropical regions, which stands out for its high production potential and forage quality. Therefore, the objective was to analyze which cutting height of the varieties "Feroz" (Diploid) and "Winter Star" (Tetraploid) obtains better performance in relation to: Crude Protein (CP); Fiber in Neutral Detergent (NDF); Fiber in Acid Detergent (FDA); Number of Profiles; Number of ears; Plant Height; Width and Length of Leaves; Number of Leaves and Number of Dead Tillers. The sowing medium was in plastic pots containing 30 liters of sifted soil, placed in a greenhouse. 10 seeds of L. multiflorum were sown on May 2, 2022, with a total of 9 pots for each cultivar. After the seedlings emerged (between May 6th and 9th), thinning was carried out, leaving only 5 plants per pot. The experimental design used was completely randomized. The treatments tested were different cutting heights, being: Lowering the height of the plant base by 15 cm, lowering the height of the plant base by 30 cm and total height (without cutting), making two cuts: The first when reaching 45 cm in height (June 29), the second when they reached 45 cm in height again (September 22). The diploid and tetraploid ryegrass cultivars showed differences for some characteristics evaluated, whether in their morphology or anatomy. It can be said that a cutting height of 30 cm can positively influence the amount of Crude Protein, while the tetraploid cultivar tends to have higher levels of Crude Protein compared to the diploid cultivar at all cutting heights and analysis stages.