Fosfato natural na adubação do capim piatã em latossolo vermelho do cerrado
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Data
2013-11-08
Autores
Rezende, Cristina Gonçalves Barbosa
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Universidade Federal de Mato Grosso
Resumo
The Oxisols have high phosphorus fixation capacity due to the
acidity and the source material. That makes phosphate fertilization be
fundamental for this would not be a limiting factor in the establishment and
production of pastures. The natural phosphate is alternative to pasture
fertilization, presenting lower cost per unit of P2O5 and high residual effect of the
element in the soil. Thus, aimed to by the present study was to evaluate the
effect of rock phosphate as a source of phosphorus in the development and
production of Brachiaria brizantha cv. Piatã in Cerrado Oxisol. The experiment
was conducted in the greenhouse of the University campus Rondonópolis
Federal University of Mato Grosso. The treatments were constituted by
application of 0, 100, 200, 300, 400 and 500 mg dm-3 of phosphorus (P2O5)
disposed in a completely randomized and design with eight replications. Were
evaluated the heigh to plants, chlorophyll content, leaf number, tiller number,
leaf dry weight, shoot dry mass, dry mass of stem, leaf / stem ratio, root dry
weight and soil pH. The results were submitted to analysis of variance by F test
at 5% probability, and when was significant performed regression study for
phosphorus dose 5% probability, by means of the statistical SISVAR. The
values found for height were: 80,04; 90,69 and 66,73 cm obtained with doses of
378,13; 300 and 338,33 mg dm-³ respectively for the three cuts. The number of
tillers in the first two cuts were 33 and 43 tillers pot-1 for phosphorus doses of
382,35 and 366,67 mg dm-3. The natural phosphate positively
influences the development and production of grass Piatã cultivated in Cerrado
Oxisol.
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REZENDE, Cristina Gonçalves Barbosa. Fosfato natural na adubação do capim piatã em latossolo vermelho do cerrado. 2013. 54 f. Dissertação (Mestrado em Engenharia Agrícola) - Universidade Federal de Mato Grosso, Instituto de Ciências Agrárias e Tecnológicas, Rondonópolis, 2013.