ADUBAÇÃO POTÁSSICA NA PRODUTIVIDADE DA SOQUEIRA DE CANA-DE-AÇÚCAR COLHIDA SEM QUEIMA

Abstract

An experiment was performed where the aim was to appraise the response of the potassium fertilization allotment in root reaped sugarcane. The experiment was installed on the Nova Aliança farm in Sales de Oliveira, São Paulo, Brazil, on the first root sugarcane (SP 80-1816). The experiment was appraised in delineation entirely casually witch 5 treatments and 4 repetitions. The treatments were constituted by rate of potassium as following: 1) 0 and 60 kg ha-1 K2O; 2) 0 and 90 kg ha-1 K2O; 3) 0 and 120 kg ha-1 K2O; 4) 60 and 60 kg ha-1 K2O; 5) 60 and 120 kg ha-1 K2O, applied to 30 and 60 days after the root sprout respectively. Technological parameters were appraised (pH, pol% sugarcane, purity, fiber, redactor sugar and recoverable total sugar) and the culms and sugar production. The potassium application in higher doses than 60 kg ha -1 K2O didn’t affect the technological quality of the root sugarcane, in the meantime the rate of 120 kg ha-1 K2O divided into two allotments made the culms production higher. It was concluded that the rate of potassium increment is more important in the culms production than for the root sugarcane technological quality.