ROCHAS BRASILEIRAS COMO FONTE ALTERNATIVA DE POTÁSSIO PARA A CULTURA DO GIRASSOL
DOI:
https://doi.org/10.26512/2236-56562006e39777Keywords:
Helianthus annuus, rock powder, rock fertilizer, agronomic efficiencyAbstract
A greenhouse experiment was carried out to evaluate the agronomic efficiency of Brazilian rocks as alternative potassium source to sunflower Helio 358 cultivated in pots, in a Rhodic Hapludox and an Ustoxic Quartzipsamment. Treatments were displayed in a factorial scheme (soils x sources x rates) in a completely randomized blocks design with four replications. The sources of potassium, volcanic sandstone, alkaline breccia, carbonatite, biotite schist, alkaline ultramaphic and potassium chloride (KCl), as the standard fertilizer source, were applied in rates of 0, 150 e 300 mg kg-1 of K2 O. At beginning of flowering, yield of shoot dry matter and concentration and accumulation of potassium in plant tissues, besides levels of exchangeable potassium in soil were evaluated. Both yield and potassium accumulation were affected by potassium sources. Biotite schist and ultramaphic alkaline rocks showed the highest potential for use as alternative potassium source and efficiencies comparable to KCl, even in the first application year, for 150 mg kg-1 of K2 O or higher rates.
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