Deficiência hídrica e adubação nitrogenada no cultivo do minimilho no cerrado
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Data
2020-10-27
Autores
Lira, Melkezedeque Alves
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Universidade Federal de Mato Grosso
Resumo
Baby corn is the name given to young ear of corn, before pollination.
Its cultivation occurs in a cycle of 70 days, a period that frames the baby corn as
a vegetable, being recognized as short, which may represent an option to
supplement the income of small farmers. Nitrogen and water are some of the
factors that most affect the development of crops in general. Thus, the objective
was to study the influence of the use of nitrogen in relation to water deficiency in
the cultivation of baby corn. The experiment was installed in subdivided plots, in
a randomized block design in a 5x5 factorial arrangement and 4 repetitions, with
5 irrigation layers (21, 29, 37, 45 and 53% of the crop evapotranspiration (ETc))
and sub -plots with 5 doses of nitrogen (0, 50, 100, 150 and 200 kg ha-1). The
first evaluation was carried out at 32 days after the beginning of the experiment
and the second evaluation 15 days after the first. The harvest started at 68 days
after sowing and was completed at 116 days after sowing. Non-destructive
phytometric analyzes were performed, such as plant height, stem diameter,
number of leaves and Falker® chlorophyll index at 32 and 47 days after sowing
and number of ears, diameter, length, weight of spikelets with and without straw.
during the harvest period, in addition to water use efficiency, and the data were
analyzed with the aid of the SISVAR statistical program. No interaction was found
between the factors for any of the variables analyzed. At 32 and 47 days after
sowing the best results pointed to a higher efficiency of the dose of 150 kg ha-1
of nitrogen and 44% of ETc in the characteristics of growth and development of
corn, while for the production of spikelets the adjustment was to the quadratic
linear regression model for both irrigation levels and nitrogen doses, however,
when the values of both factors increased, the spikelets produced were smaller,
causing a greater number of spikelets to fit the pattern commercial. The maximum
efficiency of water use was obtained with the application of a larger water layer
and nitrogen dose for this experiment. The non-interaction between factors in all
variables does not allow an adequate assessment of the influence of nitrogen in
the cultivation of minimiho in conditions of water deficiency, being appropriate
new experiments using higher doses of nitrogen and irrigation depths for a better
evaluation of the baby performance under these conditions.
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LIRA, Melkezedeque Alves. Deficiência hídrica e adubação nitrogenada no cultivo do minimilho no cerrado. 2020. 69 f. Dissertação (Mestrado em Engenharia Agrícola) - Universidade Federal de Mato Grosso, Instituto de Ciências Agrárias e Tecnológicas, Rondonópolis, 2020.