Características fitométricas de trigo adubado com nitrogênio : potássio e nitrogênio : enxofre no cerrado mato-grossense
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Data
2020-02-28
Autores
Paula, Raphael Pereira França de
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Universidade Federal de Mato Grosso
Resumo
The wheat crop has been cultivated mainly in the southern region of
Brazil, with the potential to expand to other regions such as the Midwest. High yields
have been achieved in this region, due to genetic improvement, where cultivars are
developed adapted to the region's climate and through fertilization management. The
Cerrado soils have low natural fertility, however, with the correction of soil acidity and
the application of fertilizers there is an increase in the productivity of agricultural crops.
In this context, the objective was to evaluate the phytometric characteristics of irrigated
wheat fertilized with combinations of nitrogen and potassium and nitrogen and sulfur
in two consecutive years of cultivation in the Cerrado of Mato Grosso. Two experiments
were carried out simultaneously: experiment 1: nitrogen / potassium combinations and
experiment 2: nitrogen / sulfur in the years 2018 and 2019, in the experimental area of
the Federal University of Mato Grosso, Campus de Rondonópolis. The statistical
design used was in randomized blocks in a fractional 52 factorial scheme. In the first
experiment five doses of nitrogen (0, 70, 140, 210 and 280 kg ha-1
) were used with five
doses of potassium (0, 50, 100, 150 and 200 kg ha-1
) and in the second experiment
five doses were used nitrogen (0, 70, 140, 210 and 280 kg ha-1
) with five sulfur doses
(0, 25, 50, 75 and 100 kg ha-1
), with four replications. The analyzed variables
corresponding to the growth and development of wheat plants occurred at 15, 30 and
45 days after emergence (DAE), evaluating plant height, number of leaves, number of
tillers, lodging, ear length, ear diameter and stalk length in the two years of cultivation.
The response variables were subjected to analysis of variance and regression test,
both with up to 5% probability of error by Software R (R Core TEAM, 2018). The
phytometric characteristics of Cultivar BRS 394 were influenced by the doses of
nitrogen: potassium and nitrogen: sulfur applied to the soil. Combinations of nitrogen
doses from 187.86 to 262.22 kg ha-1 combined with potassium doses from 74.62 to
183.92 kg ha-1
, provide the best responses to the evaluated phytometric and productive
variables. And the combinations of nitrogen doses from 204.83 to 265.49 kg ha-1 with
sulfur doses ranging from 3.16 to 131.76 kg ha-1
, provide the maximum results of the
analyzed variables. Thus, nitrogen fertilization influenced by doses of potassium and
sulfur applied to the soil, provide the best results for the cultivation of wheat cultivar
BRS 394 grown in Cerrado mato grossense.
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PAULA, Raphael Pereira França de. Características fitométricas de trigo adubado com nitrogênio: potássio e nitrogênio: enxofre no cerrado mato-grossense. 2020. 62 f. Dissertação (Mestrado em Engenharia Agrícola) - Universidade Federal de Mato Grosso, Instituto de Ciências Agrárias e Tecnológicas, Rondonópolis, 2020.