Abstract
The objective of this study was to evaluate the suitability ofreplacing the germination test in the calculation of seed quantity with theresults of the field emergence and accelerated aging tests. The experiment wasconducted using a randomized block design in a 2x5 factorial scheme: twolevels of seed vigor and five levels of seeding safety margin (0, 5, 10, 15 and20%) using untreated seeds of the hybrid Defender Viptera 3. The evaluatedparameters were percentage of germination, field emergence and acceleratedaging. The analyzed variable, plant stand, was submitted to analysis of varianceat the 5% significance level and, when significant, the results were submittedto the Mean Percentage Error statistical procedure to determine the degree ofproximity between forecast and observed values of stand density. The resultsshowed that, requiring a smaller safety margin, the results of field emergenceand accelerated aging tests applied in the seeding rate calculation were moreaccurate than germination for stand density estimation. For so, nevertheless,they required larger amounts of seeds in sowing operation to reach the samestand density obtained with the use of germination test.
Highlights
Resumo - O Nitrogênio (N) é o principal nutriente limitante de produtividade e componentes de rendimento da cultura do milho
Since nitrogen is the nutrient that presents the most significant effects on increase of grain yield (Soratto et al, 2011), high productivity is reached with high doses of nitrogen fertilizers
In view of the above, the objective of the present study was to evaluate the effect of applying doses of nitrogen with urease inhibitor, nitrification inhibitor, and slow-release urea in relation to conventional urea, on yield components and productivity of maize crop
Summary
Resumo - O Nitrogênio (N) é o principal nutriente limitante de produtividade e componentes de rendimento da cultura do milho. The response depends on the edaphoclimatic conditions and the crop, being higher in conditions where high losses of NH3 by volatilization are expected, such as in alkaline soil, not limited to this condition (Abalos et al, 2014) Another alternative to increase fertilization efficiency is the use of nitrification inhibitors with the purpose to delay the nitrate (NO3-) formation in the soil by the interference in the activity of the bacteria of the genus Nitrosomonas, which are responsible for the oxidation of ammonium (NH4+) to nitrite (NO2-) (Moro et al, 2013). One of them is the dicyandiamide (DCD), a nitrification inhibitor that presents increment of productivity in several crops, in particular when associated with the application of organic fertilizers, by delaying the process for up to ten weeks (Aita et al, 2013)
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