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Mineral nutrient ratios and cacao productivity

2020; Taylor & Francis; Volume: 43; Issue: 15 Linguagem: Inglês

10.1080/01904167.2020.1771582

1532-4087

Paulo César Lima Marrocos, Guilherme Amorim Homem de Abreu Loureiro, Quintino Reis de Araújo, George Andrade Sodré, Dário Ahnert, V. C. Baligar,

Pineapple and bromelain studies

The mineral nutrient ratios are parameters for evaluating the crop nutritional balance through foliar analysis. This study aimed to verify the correlations between the main mineral nutrient ratios in leaves and the cacao productivity of 48 cropping areas. The chemical analyses were carried out to determine foliar N, P, K, Ca, Mg, S, Fe, Zn, Cu and Mn nutrient concentrations. The Zn/Cu and the Ca/Mg ratios showed a positive nutritional relation with cacao productivity. The ratios with Cu as denominator – Mn/Cu, Ca/Cu, Mg/Cu, P/Cu, N/Cu and K/Cu – also showed a positive nutritional relation with cacao productivity. The P/Zn and N/Zn nutrient ratios showed a negative nutritional relation with the cacao productivity.