Resumo

GOMEZ, Manuel Iván; CASTRO, Hugo E.; GOMEZ, Clara Johanna  e  GUTIERREZ, Oscar Ferney. Optimizing bulb onion (Allium cepa) production and quality through magnesium and micronutrient (B, Zn, and Mn) balanced nutrition in the Upper Chicamocha River Valley, Boyacá*. Agron. colomb. [online]. 2007, vol.25, n.2, pp.339-348. ISSN 0120-9965.

The absence of magnesium and micronutrients (B, Zn and Mn) in fertilization plans limits the nutritional balance in onion because the above mentioned elements regulate the expression of farming productive potential and the quality of harvested product. The present research was carried out in a soil of District of Irrigation of the Upper Chicamocha River (DRAC), classified taxonomically as Sulfic Endoaquept, very thin, organic, caolinitic, isomesic (acid phase moderately deep). The results indicated favorable responses to the complementary fertilization with 70 kg·ha^-1 MgO (granulated micromagnesium 40% MgO) due to production increased by more than 50%, a notable improvement in specific gravity as compared with NPK application only, and well calibrated Mg/P relation in foliar tissue. In reference to the micronutrients, a positive interaction Mn·Zn with 4 kg·ha^-1 Mn (Microman- Manganese Sulfate, granular 20% Mn) y 3,5 kg·ha^-1 Zn (Microzinc-Zinc Sulfate, granular 22% Zn) was shown due to increase in first production on more than 18% (P<0,01). With regard to NPKMg management, the positive response was observed directly in the quality component (equatorial diameter and specific gravity), characteristics that optimize the profitability of culture; equally, a P/Zn relation important for the development, production and the nutritional management of culture was established. Boron did not present a significant effect on the evaluated variables due to its high concentrations native to acid solutions of this type of soils.

Palavras-chave : nutrition; bulb onion; interaction; micronutrients; fertilization.

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