ESPOSITO G1, CERLIANI C1, NAVILLE R1, BALBOA G2

1Facultad de Agronomía y Veterinaria; 2University of Kansas.
ccerliani@ayv.unrc.edu.ar
Presentado en: 7th World Congress on Conservation Agriculture 2017.
In south Cordoba province (Argentina) corn potential yield was determine in 20 Mg ha-1
.
Farmer‘s average yield in the area is 7 mg ha-1. This yield gap can be explained by different
management factors: seeding rate, fertilization program, use of fungicides. The aim of this
research was to evaluate the impact of different management practices on corn yield. During
2014/15 growing season an experiment was carry at Rio Cuarto National University
Experimental Field (Cordoba, Argentina). The factor evaluated includes seeding rate, starter
fertilization, nitrogen fertilization and use of fungicide. Two contrasting crop management
practices were defined as high (90.000 seeds ha-1, 150 kg ha-1 of NPSZn [10-40-10-1], 110 kg
ha-1 of N applied at V6, fungicide application at V8) and low technology (68.000 seeds ha-1, 75
kg ha-1 of NP fertilizer [18-46], 55 kg N ha-1 applied at V6). All possible combinations between
both groups of management‘s practices were evaluated in a total of 10 treatments. The
experimental design was factorial with contrasting management practices (high and low
technology) and individual management practices (seeding rate, starter, nitrogen, fungicide.
The experimental design was completely randomized design with three replications. Grain
yield and number of grains per area were measured. The results shows that there was statistical
interaction between factors. In high technology treatments decreasing seeding rate, starter
fertilizer or nitrogen diminished yields in 15.6, 13.6 and 13.9% compared with the full high
technology treatment. In low technology treatments increase in starter rate and nitrogen were
statistically significant from the rest of the combinations with a positive impact in yields of
17.4 and 23.8% compared with the control. Preliminary results suggest that there is room to
improve management practices to close yield gaps in the region on the study.

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