Características agronômicas e nutricionais da forragem e feno da aveia preta Embrapa 139 pós cultivo de crotalaria ou milho

Abstract

The need for soil conservation, preserving its chemical, physical and biological attributes, are important in sustainable production systems. One of the alternatives for its conservation and improvement of its structure is crop rotation. In this context, the aim of the present study was to evaluate the influence of the predecessor culture (crotalaria or corn) on the vegetative development and on the black oat (Avena strigosa) hay cultivar EMBRAPA 139, under production, structural characteristics, chemical composition, population of microorganisms and in situ and in vitro digestibility. The experimental design was carried out in randomized blocks with plots sub-divided in time, being allocated in the main plot the predecessor crop (crotalaria or corn), and in the sub-plots, the evaluation time (32, 42, 52, 62 and 72 days after plant emergence) and in hay (baling, 30, 60 and 90 days of storage), with five replications. Corn as a predecessor crop, promoted higher dry matter production, higher number of green and senescent leaves, lower RFC and lower ADF levels. The cultivation of sunn hemp before black oat, promoted higher RFC and higher in situ digestibility in 48 hours, of dry matter, organic matter and NDF. In relation to oat hay, corn as a predecessor crop provided lower levels of PIDN and higher in vitro ADF digestibility and sunn hemp provided the black oat hay with lower levels of indigestible protein and in acid detergent, higher levels of fiber and pH. Regarding the forage dehydration period and population of microorganisms, the predecessor culture had no interference. In this context, corn grown before black oat, provided greater forage production and greater digestibility for it, when preserved in the form of hay.