Resumo

AYON, Fernando; VELIZ, Diana  e  GABRIEL, Julio. The cowpea (Vigna unguiculata L. Walp) and its response to the application of humic acids (HA´s) in Canton Jipijapa in Ecuador. J. Selva Andina Biosph. [online]. 2017, vol.5, n.1, pp.4-14. ISSN 2308-3867.

This research was carried out in the Jipijapa canton, Manabi province of Ecuador, with the following objectives: i) to identify the dose of humic acid in the caupí crop, ii) to determine the time for foliar application of humic acid, and iii) determine the marginal rate of return in terms of cost/benefit. A plot in experimental design of completely randomized blocks (DCRB) with factorial arrangement of 4 x 3 with four replications was implemented. The variables plant height (PH), stem diameter (SD), sheath length (SL), number of decks (ND) and average weight of decks (AWD) were evaluated. The results showed that to improve cowpea production, the addition of significant amounts of iron is required. The dose of leaf application was 1000 cm³/ha of humic acids, the PH was 48.76 cm and SD of 9.66 mm. The time for foliar application of humic acids was at 30 days, the length of pod was obtained with 21.16 cm and numbers of decks with 14.34. For the weight of the mallets, the treatment was the application to the 15 days after the sowing. There was a high and significant correlation between PH and SD (0.54). When the economic analysis was carried out, the T8 treatment, 1000 cm³/ha of humic acid was applied, applied 30 days after sowing was the one with the marginal return rate with 271.43%.

Palavras-chave : Time; pod; length; treatment; MRR.

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