Cinza vegetal e manejos de aplicação na implantação e manutenção de pastagem de Urochloa brizantha no cerrado mato-grossense
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Data
2020-10-28
Autores
Simeon, Bency G.
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Universidade Federal de Mato Grosso
Resumo
The growth and proper management of forage plants represent a
basis for the implementation of efficient farm animals’ production systems. In this
sense, the Urochloa brizantha (Hochst. Ex A. Rich.) R.D. Webster cv. BRS
Paiaguás presents an important alternative for the production of forage in the
Brazilian Cerrado. Thus, the objective of this study was to evaluate the use of
wood ash in two forms of application (incorporated and not incorporated into the
soil), as fertilizer and soil correction in Paiaguás grass pasture in Cerrado MatoGrossense. The experiment was carried out in the field, at the Federal University
of Mato Grosso, Rondonópolis campus. The design used was complete
randomized blocks, with four replications, in a 5 x 2 factorial scheme,
corresponding to five doses of wood ash: 0; 8; 16; 24 and 32 t ha-1
, which
comprised the main plots (6 x 12 m), and two forms of application (wood ash
incorporated and not incorporated into the soil), which corresponded to the
subplots (6 x 6 m), which were arranged banded. Three cuts from the pasture
were realized in the years of implantation and maintenance for evaluating the
forage grass and soil, in the first and second year of conducting the experiment.
In each harvest, soil attributes, soil cover, SPAD, plant height (cm), number of
leaves, number of tillers, leaf area index (IAF), leaf / stem ratio, dry leaf mass ( t
ha-1
), dry stem mass (t ha-1
), root dry mass (t ha-1
) production and dry mass (t ha1
). The data were submitted to analysis of variance and regression (p≤0.05). The
best results regarding the development of pasture in the year of implantation
were: greater height in the third cut 90.78 cm in the incorporated form and in the
dose of 24.62 t ha-1 and 87.91 cm in the form not incorporated in the dose of
20.07 t ha-1
) and forage production of 8,15,10,63 and 7,39 t MS ha-1
, successively
in the three cuts, with the incorporation of wood ash into the soil between doses
of 16 to 24 t ha-1
. In the second year (maintenance period), dry matter production
was 7.46, 7.30 and 12.76 t MS ha-1
, between doses of 20 and 25 t ha-1
. Wood
ash increased the dry mass production of Paiaguás grass and its incorporation
increased the soil pH from 3.7 in the control dose to 6.66 in the 32 t ha-1 dose in
the first 30 days of the year of implantation of the experiment. Wood ash can be
considered a source of nutrients for forage grasses and a more economical
alternative for correcting soil acidity in the savannah of Mato Grosso.
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SIMEON, Bency G. Cinza vegetal e manejos de aplicação na implantação e manutenção de pastagem de Urochloa brizantha no cerrado mato-grossense. 2020. 113 f. Dissertação (Mestrado em Engenharia Agrícola) - Universidade Federal de Mato Grosso, Instituto de Ciências Agrárias e Tecnológicas, Rondonópolis, 2020.