CE: 3916 CF: cag114172150
RESEARCH ARTICLE
Nitrogen fertilization, effect on cane yield and Diatraea saccharalis, Fab. attack on sugarcane
Fertilización nitrogenada, efecto sobre el rendimiento y ataque de Diatraea saccharalis Fab. en caña de azúcar
Diego Augusto Fatecha Fois 1 , Maria do Carmo Lana 1 , Jessica Caroline Coppo 1 , Cesar Kent Hoshiba 1 , Bruna Broti Rissato 1 , Osmar David Cañete Escobar 2 , Erix Rubén Fernandez Gonzalez 2 Marcos Daniel Espínola Vallejos 2
1Universidad Estadual del Oeste de Paraná (UNIOESTE). Pernambuco 1777. Marechal Cândido Rondón, Brasil. CP 91.
2Facultad de Ciencias Agrarias (FCA), Universidad Nacional de Asunción (UNA). Ruta 1, Km 10, San Lorenzo,
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ABSTRACT
Nitrogen fertilization is essential to raise sugarcane yield in soils deficient in N. The objective of this study was to evaluate the effect of nitrogen application in production and borer attack on sugarcane. The experiment was conducted at Escobar District, State of Paraguarí, Paraguay. Three sugarcane growing seasons were evaluated during 2011-2013. The experimental design was randomized blocks with seven treatments and three repetitions, with annual application of increasing of nitrogen (0, 30, 60, 90, 120, 150 and 180 kg ha-1). At 360 days of each crop cycle, harvest was performed with the following assessments: industrial plant height, number of internodes per plant, infestation intensity index and yield. The nitrogen rate of maximum technical efficiency and maximum economic efficiency was determined. Statistical analysis of variance, means comparison and regression were performed. Nitrogen fertilization did not affect plant height and number of internodes, but increased yield and borer attack. For every kg ha-1 of nitrogen applied 0.25 t ha-1 of yield is added, and 0.27 % of infestation intensity index increase is obtained. The rate of maximum technical efficiency was 157,4 kg N ha-1 for a yield of 73,6 t ha-1, and the rate of maximum economic efficiency was 136.5 kg N ha-1 for a yield of 88,2 t ha-1.
