Resumo

RASCHE ALVAREZ¹, Jimmy Walter et al. Nitrogen application on two sugarcane varieties and their effect on sugarcane yield and borer attack. Investig. Agrar. [online]. 2014, vol.16, n.1, pp.1-10. ISSN 2305-0683.

To obtain high productivity in sugar cane, all available technologies and tactics seeking to improve product quality in harmony with the environment should be applied. The objective of this work was to evaluate two sugarcane varieties and to determine its response to nitrogen rates and their effect on sugar cane borer attack, in field conditions. The experiment was carried out at the research field area of Federal University of Santa Maria, RS, Brazil. A two factorial experiment containing two sugarcane varieties (RB-956911 and SP81-3250), and four N rates (0, 40, 80 and 120 kg N ha^-1). We assessed a) sugarcane stalk length, b) stem base diameter; c) number of internodes, d) number of stalk ha^-1, e) stalk yield, f) °Brix g) Intensity of Infestation (II), and h) Intensity of infestation Index (III). Results indicated that the stalk yields of RB-956911 and SP81-3250 was 111,730 and 126,752 Mg ha^-1, respectively. The °Brix was between 18.60 and 18.15, respectively. The II and III was not affected by variety, with II between entre 3.96% y 2.88% and III between 4,62% y 3.03%, respectively for sugarcane variety RB-956911 and SP81-3250. Nitrogen fertilization increases stalk yield, decrease °Brix, and does not affect sugarcane borer attack.

Palavras-chave : Diatraea saccharalis; sugarcane borer,; variety; nitrogen fertilization; trophobiosis.

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