Abstract

PAES, Herval Martinho Ferreira; ESTEVES, Barbara dos Santos  and  SOUSA, Elias Fernandes de. Determination of water requirement of okra in Campos dos Goytacazes, RJ. Rev. Ciênc. Agron. [online]. 2012, vol.43, n.2, pp. 256-261. ISSN 1806-6690.  http://dx.doi.org/10.1590/S1806-66902012000200007.

This study was carried out to describe the water needs of okra at each stage of its development, through the determination of crop evapotranspiration and crop coefficient (kc) providing subsidies to irrigated agriculture. The experiment was conducted at Station evapotranspirometers Universidade Estadual do Norte Fluminense Darcy Ribeiro in Campos State, Brazil. The cultivar used was the Santa Cruz 47, planted in a spacing of 0.25 mx 1.00 m in an area of 1024 m², irrigated by sprinkler. Area was done to determine the evapotranspiration and Kc, using a lysimeter 6 m² with an electronic scale with weight change of 0,58 kg. The results allowed to quantify the crop evapotranspiration during the period under 314 mm. The Kc of okra in the first stage of development varied between values of 0.8 and 0.5, obtaining the average value of 0.68, the second stage ranged from 0.5 to 1.0, with a mean of 0,79,and the third stage Kc ranged from 1.0 to 0.3, the average being 0.54.

Keywords : Irrigation management; Evapotranspiration; Kc; Soil water tension.