Atividade de enzimas oxidativas em caldo de cana-de-açúcar em função do sistema de plantio

Abstract

The Brazil is the largest producer of sugarcane and sugarcane´s ethanol, and attracting worldwide interest because of the diversity of products that it can be produced. The ethanol derived from sugarcane is shown as an energy alternative to oil, being a source of renewable energy and less polluting. The aim of the research will evaluate the effect of straw deposited in the soil, stumps of sugarcane, RB 86 7515 cultivar was planted in two different systems (windrow and groove) and received different treatment of the hydrogel polymer (0,00; 26,66; 53,33 e 80,00 kg ha-1), in the levels of the enzyme polyphenoloxidase (PPO) and peroxidase (POD). The RB 86 7515 cultivar was planted in december 2007, harvested june 2009 (18 months), the monitoring installed this cultivar was at Presidente Prudente´s conditions, Campus II, UNOESTE. The soil of the experiment was characterized as Ultisol Red Yellow Distroferric typical to moderate, medium-loamy texture (Embrapa, 1999). The climate is classified as Aw, with the summer rainy season and dry season in winter. The levels of polyphenol oxidase and peroxidase were evaluated during the harvest period. The experiment consisted of five lines with five meters long, with spacing of 1.5 (area of 37.5 m2) the samples were collected at three internal lines and analyzed, ignoring the first and last meters of the extremities. This area was sampled randomly a stem, which removed the first internode from the top. (First bud without green leaves). The synthetic polymer added to the soil promotes changes in the studied enzymes. The coverage with crop residue does not promote changes in the studied enzymes. The planting system does not promote changes in the studied enzymes. The enzymes showed enzymatic activity changes in vegetative cycle.