VIANA, Sérgio B. A.; BEZERRA, José R. C.; GHEYI, Hans R.; FERNANDES, Pedro D.; MARQUES, André.; S. NETO, Manoel N. de.
Résumé:
Cotton cultivation is expanding in the western part of Bahia and needs technical scientific research base to improve the orientation to the producers. Seeking to contribute for the
development in the area, this work was accomplished at Santa Cruz Farm, located in Barreiras-BA
(coordinates 12º03'09” of latitude South, 44º57'46,6” of longitude West of the meridian of Greenwich)
during March to September of 2004. They were evaluated the physical and financial returns of the
herbaceous cotton (Gossypium hirsutum L. r.) cultivar Acala 90, as function of water depth were
evaluated, under central pivot, in a Yellow Latosol (loamy sand). The treatments were 0.75, 0.90, 1.05
and 1.20 of the evapotranspiration of the crop (ETc) (L1 to L4), besides the handling of water of the
farm (Lp). The production function obtained for the cotton had the maximum point at water depth of
671 mm and production of 5,522.8 kg.ha-1 of cotton, but the economical depth (L*) was found to be
656.5 mm (for 0,3 in the relationship: R$.mm-1.ha-1/R$.kg-1 of cotton in pit); Z obtained with L* was
352.34 kg.ha-1 superior to that obtained under the water management of the farm, resulting in an
additional net return of 25.82%.
