Características produtivas e nutricionais de gramíneas forrageiras em condições de excesso e déficit hídrico
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Data
2013-01-12
Autores
Kroth, Bruna Elusa
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Universidade Federal de Mato Grosso
Resumo
The drought and the flooding can cause reduction in the
availability and quality of pastures. The objective was to evaluate the
development of three cultivars of Brachiaria brizantha under soil water
availability. The experiment was conducted in a greenhouse at the University
Campus Rondonópolis. The experimental design was completely randomized
in a 3x3 factorial with three cultivars brizantha (cv. Marandu, cv. Piatã and cv.
Xaraés)and three water availability, being flooded soil (0 kPa), field capacity
(10 kPa, control) and drought (50 kPa), 5 replicates. The soil used was
Fluvic, being held fertilization with phosphorus and potassium in doses of 250
and 100 mg dm-3, respectively, and applied 200 mg dm-3 nitrogen
applications in four installments. Evaluations were performed at 45, 75 and
105 days of treatment installation. The variables studied were plant height,
chlorophyll content, number of leaves, dry weight of leaves, stems, shoots
and roots, leaf/stem ratio, relative dry mass of shoots and roots, soil pH and
concentration nitrogen. The results were submitted to ANOVA and Tukey test
at 5% probability by statistical program SISVAR. The Marandu was the most
tolerant to flooding, followed by Piatã. The Xaraés proved to be much more
sensitive to drought and the flooding. The highest concentration of nitrogen
occurred in the treatment of water deficit. The cultivar with the highest
nitrogen concentration was the Piatã, however not the deferred Xaraés.
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KROTH, Bruna Elusa. Características produtivas e nutricionais de gramíneas forrageiras em condições de excesso e déficit hídrico. 2013. 64 f. Dissertação (Mestrado em Engenharia Agrícola) - Universidade Federal de Mato Grosso, Instituto de Ciências Agrárias e Tecnológicas, Rondonópolis, 2013.