Algodoeiro fertirrigado com nitrogênio via gotejamento
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Data
2019-02-28
Autores
Silva, Paula Caroline Lima
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Universidade Federal de Mato Grosso
Resumo
The production of cotton in Brazil has a great worldwide prominence with the
predominance of dry crop, in few studies on the irrigated cotton. The objective of
this study was to evaluate the performance of cotton fertigation with nitrogen via
drip irrigation. The study was carried out in the experimental area of the Graduate
Program in Agricultural Engineering of the Federal University of Mato Grosso,
University Campus of Rondonópolis, from June to November 2017 and May to
October 2018. The experimental design was in a randomized complete block
design with four replications, in a 3 x 3 factorial scheme based on the central
compound with 9 treatments, with three levels of irrigation (50, 100 and 150%
ETc) via drip irrigation and three levels of nitrogen fertilization (20, 110 and 200%
of 155 kg ha-1
) via fertigation. The analyzed variables were phytometric,
productive characteristics and quality of the cotton plume. The variables were
submitted to statistical analysis on the response surface using software R, up to
the 5% probability level. Not meeting the selection criteria of the response surface
model, we studied the isolated effects and interaction of the factors through the
polynomial regression analysis. In the year 2017, no significant difference was
observed for the surface response model for plant height at 67.82 and 97 DAE,
SPAD chlorophyll index at 67.82, 112, 127 and 142 DAE, cotton yield at cotton
seed yield and fiber yield. Nitrogen fertilization of 200% N (310 kg ha-1
) provided
higher plant height (53.63 cm) at 67 DAE, SPAD chlorophyll index (54.06) at 97
DAE, cotton yield at (514.14 kg ha-1
), cotton yield in feather (241.13 kg ha-1
) and
water use efficiency (2.30 kg ha-1 mm -1
). The irrigation of 110% ETc provided
higher cotton seed yield (469.34 kg ha-1
) and feather (234.00 kg ha-1
). In the year
2018, all variables were adjusted to the surface model of responses, except stem
diameter at 55 DAE, SPAD chlorophyll index at 70 DAE and fiber yield in the two
years of cultivation. Nitrogen fertilization and irrigation have a positive influence
on herbaceous cotton production with significant gains in its production.
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SILVA, Paula Caroline Lima. Algodoeiro fertirrigado com nitrogênio via gotejamento. 2019. 100 f. Dissertação (Mestrado em Engenharia Agrícola) - Universidade Federal de Mato Grosso, Instituto de Ciências Agrárias e Tecnológicas, Rondonópolis, 2019.