GONÇALVES, R. S.; http://lattes.cnpq.br/6820200099238331; GONÇALVES, Rubens de Sousa.
Resumen:
Abiotic stresses affect the production of many agricultural crops, such as water stress, which
has been a worldwide problem. Cotton, despite being a water stress tolerant crop, can have
deleterious effects on its physiology, morphology and production when subjected to water
restriction. Thus, the objective of this work was to evaluate the morphophysiology and
production of colored fiber cotton genotypes under water deficit, varying the phenological
phases of the plants in the second production cycle. The research was carried out between
July and November 2021, at the Agro-Food Science and Technology Center of the Federal
University of Campina Grande, Pombal, Paraíba. The experimental design was randomized
blocks, in a 3 × 10 factorial scheme, with three cotton genotypes (‘BRS Rubi’, ‘BRS Jade’
and ‘BRS Safira’) and ten irrigation management strategies, with three replications and two
plants per plot, totaling 180 plants. The water deficit in the vegetative phase reduced the
growth of the colored fiber cotton genotypes in the second production cycle. The BRS Safira
genotype showed better development with a higher relative growth rate in plant height and
stem diameter stem dry phytomass and total seed mass regardless of the irrigation strategy. In
the flowering phase of the cotton plant, irrigation with water deficit can be used in cotton
cultivation with the lowest losses in root dry mass, which is negatively affected by the water
deficit in the vegetative and fruiting phases.