FÉLIX, C. M.; http://lattes.cnpq.br/1679356879560628; FÉLIX, Charles Macedo.
Résumé:
Water scarcity is one of the main limiting factors for the cultivation of several crops, especially
in semi-arid regions. Cotton, despite being a water deficit tolerant crop, can have its
physiological processes and productivity affected by this factor, so the use of deficit irrigation
management strategies is an alternative to be considered. Thus, the objective of this work was
to evaluate the growth, physiology, phytomass accumulation and production of naturally
colored fiber cotton genotypes under water deficit in the different phenological stages of the
crop. The plants were conducted in drainage lysimeters under field conditions, at the Federal
University of Campina Grande, located in the municipality of Pombal, Paraíba. A randomized
block design was used, in a 7 × 3 factorial scheme, corresponding to seven water deficit
management strategies (1- A1B1C1; 2- A2B1C1; 3- A1B2C1; 4- A1B1C2; 5- A2B1C2; 6- A2B2C1;
7- A1B2C2) varying during the phenological phases of the crop (vegetative, flowering and
fruiting) and three colored cotton genotypes (BRS Rubi, BRS Jade and BRS Safira). In the
vegetative and formation phases of cotton production, water deficit irrigation can be used in
cotton cultivation with the lowest losses in production components, which are negatively
affected by water deficit in the flowering phase. Among the genotypes, BRS 'Jade' stands out
for the highest mass of cotton seed, and BRS Rubi for the highest accumulation of dry
phytomass of the aerial part, regardless of the development stage. Flowering and stress
succession between phenological stages cause reductions in the production of naturally colored
cotton at 120 days after sowing.