Abstract

It is essential for the farmer, to have information of cultural costs when deploying a new crop or new technology. The cost of the study allows decision making for new technologies and use of viable inputs in production (Richetti, 2011; Souza et al., 2012). Zimmermann (2005), when studying technical and economic viability of canola crops, stated that canola is economically viable. The aim of this work was to assess the economic viability of different quantities of nitrogenous fertilizers applied in coverage of canola (Hyola 61) crop. The experiment was conducted in a eutrophic Red Latosol, with geographic location of 24°49'06" south latitude and 53°16'44" west longitude, altitude of 682 m and presents subtropical (Cfa) climate, in the Agrícola Andreis experimental farm, in Corbélia, Paraná. The experimental design consisted of randomized blocks with four replications and seven treatments, totaling 28 plots with an area of 31.5 m² each. Quantities used to verify canola response were: T1 to 0 kg ha^-1 N (control); T2 to 25 kg ha^-1 N; T3 to 50 kg ha^-1 N; T4 to 75 kg ha^-1 N; T5 to 25 kg ha^-1 N + 27 kg ha^-1 S; T6 to 50 kg ha^-1 N + 54 kg ha^-1 S (both in solid form) and T7 to Micro Xisto HF (liquid form) foliar fertilizer. An F-test (Analysis of Variance) was used in order to verify statistical difference among treatments, followed by Tukey’s means comparison test, at 5% significance. Grain yield presented a statistically non-significant tendency to increase. Nitrogen top dressing did not provide economic return for the climatic conditions observed in this harvest.

Key words: Brassica napus L. var. oleifera, fertilizer, production.