RENDIMENTO E QUALIDADE DA CANA-DE-AÇÚCAR IRRIGADA SOB ADUBAÇÕES DE NITROGÊNIO E POTÁSSIO EM COBERTURA
2009
Audenice Bezerra da Silva | José Dantas Neto | Carlos Henrique de Azevedo Farias | Carlos Alberto Vieira de Azevedo | Hamilton Medeiros de Azevedo
The objective of this work was to evaluate the effect of different levels of nitrogen and potassium fertilization, applied in covering, on the yield and quality of sugarcane (Saccharum ssp., variety SP- 716949) under irrigation. The experiment was conducted in an area of the Miriri`s distillery, in the Capim district, PB. The treatments were constituted by four levels of covering fertilization: AC1- 85 kg ha-1 ( 44 kg de N plus 41 kg de K2O), AC2 - 167 kg ha-1 (86 kg de N plus 81 kg de K2O), AC3 - 305 kg ha-1 (157 kg de N plus 148 kg de K2O), AC4 - 458 kg ha-1 (236 kg de N plus 222 kg de K2O), arranged in an experimental design of randomized blocks, with three replications. The analyzed variables were: productivity of stems, percentage of ºBrix, Pol and PCC, yield of sugar and alcohol. Among of studied variables, just the productivity of stems was affected significantly (p < 0.05) by the fertilization. The regression analyses revealed that the largest productivity of the stems (108.21 t ha-1), the maximum percentage of PCC and ºBrix (14.35 e 20.40%) and the maximum yield of alcohol (9948 L ha-1) were obtained with the level of covering fertilization of 458 kg ha-1 (236 kg de N plus 222 kg of K2O).
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