Abstract
Evaluation of extractors and phytoavailability of zinc in corn crop in eutrophic latosol. The agricultural productivity may be limited by the micronutrients deficiency. This study aimed at evaluating and testing chemical extractors (Mehlich1 and DTPA) for zinc extraction in corn crop in eutrophic latosol and determine the contents of this metal in the corn cultivated in this soil. The experiment was performed in randomized blocks, with 4 replications. The treatments were distributed in a factorial design 3x3, being 3 ways of manure activity as follows: no manure activity; recommended doses, twice the recommended doses and three doses of zinc: 0,0; 5,0 and 10,0 mg dm 3 . In high contents of Zn (loamy soils) DTPA was efficient, whereas in smaller contents Mehlich1 showed a more efficient extraction capacity. Compared to DTPA, the extractor Mehlich1 presented a better correlation between the soil and foliar extracted amounts of Zn. The phytoavailability of zinc was proportional to the contents in the soil.
Highlights
O aumento da produtividade de grãos associada à prática do uso de micronutrientes tem se intensificado nos últimos anos
The agricultural productivity may be limited by the micronutrients deficiency
determine the contents of this metal in the corn cultivated in this soil
Summary
O aumento da produtividade de grãos associada à prática do uso de micronutrientes tem se intensificado nos últimos anos. Os valores mais altos do coeficiente de correlação entre a concentração de Zn em folhas de amendoim e o teor de Zn no solo foram obtidos pelo uso dos sais diluídos, como KCl, CaCl2 e NH4Cl, CaSO4 e MgCl2 (Davies e Parker, 1995).
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