Published in Scientific Papers. Series A. Agonomy., Vol. LVI
Written by Nicolae IONESCU, Gelu MUJEA, Marilena DIACONU, Ana IORDĂNESCU, Sorin Gabriel IONESCU
Lately is deemed nickel (Ni) like a micronutrient (MICROn) essential to the entire food chain: plant-animal-man (Stevenson and Cole, 1999). This is, however, a chemical element in the category of heavy metals (Adriano, 2001). Expression in the agricultural environment of Ni concentrations between deficiency (Alloway, 2008; Bell, 2000) and excess can occur both in nature reserves in the soil, and the contribution of manure. To observe trends of Ni content in soil and plants were used progressive doses of sludge 0:50 t.ha-1, together with chemical fertilizers. We generally mobile forms experienced declining trends between 6 and 4 mg.kg-1 d.w. in all four years of culture. It is possible that Ni is detained by forces stronger than the molecules of sludge. Plants have specific concentrations of Ni content in both leaves at flowering and the mature seeds. Correlations obtained in bloom shows increasing concentrations of maize (between 1 and 2 mg) and wheat (4) (3 to 4 mg), and decreasing in wheat (2) (from 3 to 2 mg) and soybean (10 to 6 mg). Mature beans contained Ni inverse relationship with the applied doses: 1 mg in maize, between 3 and 5 mg in wheat (2), between 45-30 mg soybean and between 4 to 3 mg of wheat (4). Such research shows aspects of plant nutrition and highlight the natural cycle of the Ni.
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