Azevém anual submetido a cortes com base na escala Haun

Abstract

Annual ryegrass is one of forage species most used during the winter period in southern Brazil, and for the early realization of cuts or grazing forage that has been recommended as an indicator height. But the time may be different depending on soil and climate conditions. This work aimed to evaluate the growth (dry matter production) and development of annual ryegrass subjected to cuts based on the use of a morphological indicator, the Haun scale (HS). The experimental design was randomized blocks with four blocks and five treatments (cutting with an average of 4, 5, 6, 7 and 8 by the Haun scale (HS)). It was used to cultivate ryegrass Barjumbo (tetraploid). It was determined dry matter production in two cuts, efficient use of photosynthetically active radiation (EUR) and total dry matter. The average value of Haun scale (HS) ryegrass in which the first cut is made to influence the production of dry matter. The completion of the first cut in annual ryegrass pastures with an average value of Haun Scale (HS) 8 enabled highest total dry matter yield (11372.63 kg ha-¹) and efficiency in the use of radiation (EUR) (1, 28 and 0.68 g MS m-² MJ-¹ in the first and second cut, respectively). The use of a morphological indicator as Haun scale (HS) enables improved management practices such as making cuts.