Intercropping is an agricultural system that facilitates mutualistic and commensalist interactions among crops. The objective of this research was to test the hypothesis that intercropping with greater plant richness produces more roots that improves microbial activity, which in turn, contributes to soil physical structure that improves soil chemistry parameters, crop yield, and land use. We performed a field experiment in a randomized block design, utilizing beans (Phaseolus vulgaris), maize (Zea mays), and eggplant (Solanum melongena), under monoculture or intercropping systems. Root and soil biological, physical and chemical parameters, crop yield and land equivalent ratios were analyzed. Increased plant richness as a function of the intercropping system did not affect root and soil parameters. However, principal component analysis indicated that intercropping affected root density, mass, and length, which, in turn, contributed to the formation of soil aggregates, increased microbial activity and to the improvement of soil chemical parameters. Furthermore, as consequence of increased plant richness, the maize-beans-eggplant intercropping facilitated the positive interactions among the species and led to a Land Equivalent Ratio (LER) 60% higher than the monoculture systems. The production of roots in the crop systems, regardless of species richness, stimulates soil biological activity and affects the quality of physical structure and fertility indicators of the soil. Crop systems with higher richness of plant species promote positive interactions between plants and soil and results in a better land use ratio.
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The authors would like to thank the staff of the Department of Soil and Agricultural Engineering and Canguiri Experimental Farm of the Federal University of Paraná (UFPR - Universidade Federal do Paraná) and the student Valdeci Antônio dos Santos for their support in the accomplishment of this work. This research was supported by funding from the Post-Graduate Program in Soil Science of UFPR. The authors Cristhian Hernandez Gamboa, Jeidi Yasmin Galeano Cobos and Guilherme Alex da Costa acknowledge scholarships from the National Council for Scientific and Technological Development (CNPq) of Brazil.
This study was funded by the National Council for Scientific and Technological Development (CNPq) of Brazil (grant number 131406/2014–0).
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Gamboa, C.H., Vezzani, F.M., Kaschuk, G. et al. Soil-Root Dynamics in Maize-Beans-Eggplant Intercropping System under Organic Management in a Subtropical Region. J Soil Sci Plant Nutr 20, 1480–1490 (2020). https://doi.org/10.1007/s42729-020-00227-9
- Crop consortium
- Soil aggregation
- Soil organic carbon
- Land equivalent ratio