Phosphate limestone, soil improver and nutrient source for Macroptilium Atropurpureum cv. Siratro
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Abstract
The search for fertilization alternatives for forage crops based on the use of domestically produced nutrient sources is imperative to reduce the costs of animal feed production and to reduce the use of external inputs. Based on this premise, an experiment was conducted under semi-controlled conditions to determine the effect of phosphate limestone, a mineral of national origin, on soil fertility, nutritional status and yields of Macroptilium atropurpureum cv. Siratro, grown in a low fertility soil. Five treatments (1 t ha-1 lime, 50 kg ha-1 P2O5, 1 t ha-1 lime+ 50 kg ha-1 of P2O5, 1 t ha-1 phosphate lime and a control without lime and phosphorus) were evaluated in a completely randomized design. Indicators of soil fertility, biomass macronutrient concentrations, nodulation effectiveness and crop yields were evaluated. Phosphate limestone reduced soil acidity and increased its assimilable P content. Its application increased biomass N, P and Ca concentrations, the number and effectiveness of root nodules, and plant aerial and root biomass yields, with results similar to those obtained with lime and phosphoric fertilizer. It is concluded that the use of phosphate limestone constitutes an agronomically effective alternative to improve soil fertility, reduce the use of synthetic phosphoric fertilizer and increase the productivity of Macroptilium atropurpureum cv. Siratro.
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