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ECONOMIC ASPECTS OF NITROGEN FERTILIZATION IN THE CORN CROP IN NO TILLAGE SYSTEM

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Author(s): EDSON CABRAL DA SILVA | SALATIÉR BUZETTI | EDSON LAZARINI

Journal: Revista Brasileira de Milho e Sorgo
ISSN 1676-689X

Volume: 4;
Issue: 3;
Start page: 286;
Date: 2005;
Original page

Keywords: economical efficiency | technical efficiency: savannah | no-tillage | Zea mays

ABSTRACT
Nitrogen (N) is the nutrient uptake in largest quantity by corn and it has the higher influence on the grain yield, and it has the higher share in the cost of corn crop production. Aimed at evaluating economically and comparing technical rates and application schedule of nitrogen as urea, on corn cropped in no tillage, this study was conducted at Experimental Station of UNESP/FEIS - Ilha Solteira campus, located in Selvíria, MS, Brazil, during the 1998/99 and 1999/00 growing seasons. Soil utilized was a dystroferric Red Latosol, previously under savannah vegetation. The experimental design was a randomized complete blocks, with 19 treatments and four replications in an incomplete factorial (6 x 3) + 1 (control: 0 kg ha-1), being combinations of three N rates (60, 120, 180 kg ha-1) with six splits of N application (total N rate at sowing, total N rate at four to six leaves stage, total N rate at eight to ten leaves stage, half N rate at sowing and half N rate at four to six leaves stage, half N rate at sowing and half N rate at eight to ten leaves stage and, half N rate at four to six leaves stage and half N rate at eight to ten leaves). Economically speaking, the 120 kg ha-1 N rate applied half at seeding and half at four to six leaves stage provided the higher net revenue and profit. The maximum economical efficiency, considering only the fertilizer cost and corn price ratio of 8.25:1 was reached with 126 kg ha-1 of N, also supplied half at seeding and half at four to six leaves stage.
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