Alface americana submetida à adubação nitrogenada e tensões de água no solo em ambiente protegido
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Data
2013-12-13
Autores
Carvalho, Kassio dos Santos
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Universidade Federal de Mato Grosso
Resumo
Lettuce is a culture demanding in water consumption and the
irrigation appropriate management is major, as well as nitrogen fertilization
because nitrogen is a nutrient that stimulates plant development. This study
aimed to evaluate the effect, isolated and associated soil water tensions and
nitrogen levels applied in a Grossense Mato Cerrado of red oxisol with the
development of the culture of lettuce under controlled conditions. The
experiment was conducted in pots with capacity for 7 dm3 of soil end in
greenhouse. The experimental design was completely randomized in a 4x5
factorial design, with 20 treatments (15, 30, 45, and 60 kPa soil water tension
and 0, 50, 100, 150 and 200 mg dm-3 nitrogen) and four replications. The
nitrogen source used to urea and tensions were controlled by tensiometers
installed at 10 cm depth in the experimental units fertilized with 100 mg dm-3
nitrogen. The analyzed variables were: leaves and total aerial parts of green
weight, of leaves number, weight dry leaf, total and root, chlorophyll content, of
plant height and leaf area. The results were subjected to analysis of variance
and when significant regression, both 5% probability. In general, the further
development of variable of leaves green weight and total dry mass of leaves,
root and total of number leaves and leaf area was observed in the soil water
tension of 15 kPa. The biggest plant height and chlorophyll content was
checked with application 66.75 and 107.67 mg dm-3 of nitrogen, respectively.
The root dry weight decreased with increasing nitrogen fertilization. The
chlorophyll content and root dry weight showed interaction between the water
tension in the soil and the nitrogen.
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CARVALHO, Kassio dos Santos. Alface americana submetida à adubação nitrogenada e tensões de água no solo em ambiente protegido. 2013. 54 f. Dissertação (Mestrado em Engenharia Agrícola) - Universidade Federal de Mato Grosso, Instituto de Ciências Agrárias e Tecnológicas, Rondonópolis, 2013.