Remineralizador de solo e seus efeitos sobre o teor de fósforo nas folhas em diferentes texturas do solo,na produtividade do milho

Abstract

Brazil is an important producer and exporter of agricultural commodities, but its low domestic fertilizers production makes it the world's fourth largest importer of these inputs. This scenario contributes to the country's vulnerability to global price instability. Corn is demanding phosphorus. The research hypothesis is that applying the remineralizer promotes an increase in leaf P content, stimulating water use efficiency and productivity. Therefore, the research aimed to evaluate P content in the soil, plant, water use efficiency, and corn productivity in different soil textures. The experimental design used was a 2×6 factorial + (control) with four replications: different soil textures: LVd with clayey texture and CXbd with medium texture, both collected in native forest in the first factor. The second factor was soil remineralizer concentrations (0; 4; 8; 12; 16 and 20 Mg ha-1 ) and control treatment using Ekosil remineralizer registered with MAPA. The plants were grown in pots with 14 dm-3 of soil. The average soil texture (CXbd) is 7% higher in the concentration 4 Mg ha-1 Complete when compared to the absence (application of KCl fertilizer). For the interaction of different soil textures, 4 Mg of Completo was higher than CXbd and LVd 0 and 12 Mg ha-1 . For corn leaf P content in the presence of control (Ekosil) and Complete, there was a 42% increase in the CXbd texture. For the clayey soil texture (LVd) there was the same trend in the presence of Ekosil and 8 and 12 Mg ha-1 Complete, the P content in the leaf was 33% higher when compared to its absence. For water use efficiency in corn leaves and productivity, it was not possible to identify the treatments that provided better effects. For corn productivity in medium (CXbd) and clayey (LVd) soil textures, no difference between Ekosil and Complete and absence was observed. The research concludes that applying remineralizer to the soil increases the P content in the leaf and does not affect the P content in the soil, water use efficiency, and corn productivity.