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vol.25 número1CRECIMIENTO DE PLÁNTULAS A PARTIR DE TRES TAMAÑOS DE SEMILLA DE DOS CULTIVARES DE MAÍZ (ZEA MAYS L.), SEMBRADOS EN ARENA Y REGADOS CON TRES SOLUCIONES OSMÓTICAS DE SACAROSA índice de autoresíndice de assuntospesquisa de artigos
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Idesia (Arica)

versão On-line ISSN 0718-3429

Resumo

MENDEZ-NATERA, Jesús Rafael et al. COMPARISON BETWEEN BASED-WATER PERFORATION FLUID AND CHEMICAL FERTILIZATION IN COWPEA (VIGNA UNGUICULATA (L.) WALP.). Idesia [online]. 2007, vol.25, n.1, pp.7-20. ISSN 0718-3429.  http://dx.doi.org/10.4067/S0718-34292007000100002.

The objectives of this work were to evaluate the effect of a waste of nondisperse water-based drilling fluid (WDF) on seed germination, vegetative traits and nodulation traits in the cowpea crop and to compare WDF with a chemical fertilizer (CF) for the above characters. Two soil types were used: savanna (sand lime texture) and “vega” (lime clay texture). Soils were put in aluminum trays where cowpea cv. Tejero Criollo was sowed. Fertilization treatment were: a) without fertilizer; b) CF equivalent to 300 kg 15-15-15/ha and c) WDF equivalent to dosage of treatment b. A split-plot design was used with four replications, the two soil types were main plots and the three fertilization treatments were subplots. The Least Significant Difference Test was used and the probability level was 0.05. The WDF was characterized chemically to approximate it to CF used, WDF did not have heavy metals. There were not significant differences found neither for germination at 3 and 4 days after sowing (DAS), with averages of 86.17 and 95.17%, respectively, nor for average number of total germination days and germination velocity, whit averages of 3.2 and 7.9, respectively. The biggest germination percentage at 8, 12, 24 and 26 DAS was obtained with WDF, being similar statistically to that of CF, but superior to treatment without fertilization. The biggest plant height at 8, 20, 28 and 36 DAS was obtained for the savanna soil, while for 12 DAS, savanna soil with WDF or CF produced the taller plants. At 28 and 36 DAS, the plants were taller in the soil with CF and WDF in comparison with the soils without fertilization. The biggest number of leaves and stem diameter were obtained with savanna soil and WDF. Root length, root volume and root dry weight were not affected by treatments. The heaviest shoot were found in the savanna soil with WDF and CF. The fertilization treatments and the soil types did not affect the nodulation characters. The general means were for fresh and dry nodule weight, 0.41 and 0.14 g, respectively, and number of total, pink and white nodules, 47.4, 32.3 and 15.0 nodules/plant, respectively. These results indicate the potential use of waste of nondisperse water-based drilling fluid as possible fertilizer in the cowpea crop because it stimulated the seed germination, improved the growth and development of the seedlings and did not have a negative effect on nodulation characters.

Palavras-chave : Cowpea; drilling fluid; seed germination; seedling growth; nodulation.

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