Resumo

DIAZ FRANCO, Arturo; ORTEGON MORALES, Alfredo Sergio  e  RAMIREZ DE LEON, José Alberto. Productive Competitiveness of four Okra Hybrids in Planting Dates in Northern Tamaulipas. Agric. Téc. Méx [online]. 2007, vol.33, n.1, pp.25-32. ISSN 0568-2517.

The main okra producing area in Mexico is northern Tamaulipas. In this region yearly production occurs in two periods, an early sowing period from February to March, and a late sowing period from April to May. In this region cultivars of the Clemson Spineless 80 type are widely grown. The yield of okra hybrids PX41596, PX41696, Cajun Delight and Cajun Delisht, was evaluated in four planting dates in 1998 (Feb 26, Mar 18, Apr 17, and May 11) and 1999 (March 1^st and 20th, April 19, and May 11), at Rio Bravo, Tamaulipas, Mexico. In comparison with cv. Clemson Spineless 80, early fruit yield (first month of harvest production) and total fruit yield of the hybrids was significantly superior in 227 and 29%, respectively. The highest fruit and foliar chlorophyll content were observed in hybrids PX41596 and PX41696, both traits were correlated (R²= 0.77**). In both years, the highe st early fruit yield (3101 kg ha-¹) was obtained in the early sowing period. The February 26, 1998 and March 1 st, 1999 sowing dates, gave the highest total fruit yield (14 975 kg ha-¹) and the higher plant height (112.8 cm). The highest values of early fruit yield (3172 kg ha-¹), total fruit yield (16 501 kg ha-¹), plant height (99 cm), and harvest period (13 to 15 weeks) were registered in 1999. Positive correlations were found between early and total fruit yield (r= 0.60* *), and between total fruit yield and plant height (r= 0.85**). The okra hybrids tested had a higher productivity than the cv. Clemson Spineless 80.

Palavras-chave : Abelmoschus esculentus (L.) Moench.; early fruit yield; total fruit yield; fruit and foliar chlorophyll; plant height.

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