Nutritional status of soybean in different agricultural succession systems in the Midwestern Paraná, Brazil

Abstract

The adoption of different agricultural succession systems can influence the availability, dynamics, and accumulation of nutrients. This study aimed to analyze the impact of succession systems on the nutritional characteristics of soybean in succession. The study was conducted in the Midwest region of Paraná, Brazil. The experiment was carried in randomized block design, with eight species in the autumn/winter season (spontaneous, black oat, brachiaria ruziziensis, oilseed radish, corn, wheat, black oat intercropped with radish, and corn intercropped with brachiaria ruziziensis) and four replications, with soybean cultivation in succession. The content of macronutrients (N, P, K, Ca, Mg and S) and micronutrients (B, Cu, Fe, Mn and Zn) in soybean leaves during the flowering period were analyzed. The data were subjected to the analysis of variance. The means were grouped by the Scott-Knott test, with a 5% probability. The data were also compared with the reference levels for soybean and with the Integrated System of Diagnosis and Recommendation (DRIS), obtaining the Nutritional Balance Index (NBI). The succession system had a significant effect (p < 0.05) on the contents of N, P, S, and Cu. Ca, Mg, and Mn had contents above the reference range, while B values were lower; there was variation according to the system for other nutrients. P was the nutrient with the most significant limitation in soybean cultivation after spontaneous species. In contrast, for the other systems, the limiting nutrient was S. Concerning NBI, the best result was obtained with black oat and soybean succession.

Keywords:

• Glycine max
• no-tillage
• plant nutrition

Additional information

Funding

This work was supported by the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior – Brasil (CAPES) under Grant 001, and Fundação de Estudos Agrários Luiz de Queiroz (FEALQ) under Grant 2917/20.