Modern agriculture faces the challenge of increasing production without expanding cultivated areas, promoting sustainable practices that ensure food security and environmental preservation. Integrated crop–livestock systems (ICLSs) stand out as an effective strategy, diversifying and intensifying agricultural production in a sustainable manner, ensuring adequate soil cover, and improving nutrient cycling efficiency. Thus, this study aimed to explore and compare integrated crop–livestock systems with Zuri guinea grass (Panicum maximum cv. BRS Zuri) and Quênia guinea grass (Panicum maximum cv. BRS Quênia) against the conventional soybean/maize succession method in a tropical region, and how these systems affect biomass decomposition, C:N ratio, nutrient cycling, and fertilizer equivalents. A field experiment was conducted in two phases: the first in the second-crop season and the second in the main season, using a randomized block design with four replicates. The treatments consisted of two ICLS systems, one with Zuri and Quênia guinea grasses established after soybean, and a succession system with maize established after soybean. The results indicated that Quênia guinea grass showed greater desiccation efficiency, with an injury rate of 86.5% at 21 days, 8.5% higher compared to Zuri guinea grass. In terms of biomass, Zuri and Quênia guinea grasses had average productions of 7021.1 kg ha⁻¹, which was 43.25% higher compared to maize biomass. The biomass decomposition of the grasses was faster due to their lower C:N ratio, resulting in greater nutrient release into the soil. Both forage grasses (Zuri and Quênia guinea grasses) are suitable for integrated crop–livestock systems, as they showed similar biomass production and nutrient accumulation. Soybean yield was not influenced by the different cropping systems, showing similar results between the biomass of Zuri and Quênia guinea grasses and maize. However, grass biomass enriches the soil more through the return of fertilizer equivalents, which in future studies could be considered for the reduction of mineral fertilizers, ensuring greater sustainability of agricultural systems.

The ensiling potential of Tamani guinea grass (Panicum maximum cv. BRS Tamani) and Stylosanthes cv. Bela in monoculture or intercropped systems, and the effect of two treatments on ensiling (with and without inoculant) on fermentation quality and nutritional composition of the silage after 50 days of ensiling, were evaluated. The experiment was conducted at the Instituto Federal Goiano, Campus Rio Verde, Goiás, Brazil, using a randomized block design with four replications in a 3 × 2 factorial scheme, totaling 24 experimental silos. The forage was harvested during a 28-day regrowth cycle. Results indicated that silages without inoculants showed inadequate fermentative characteristics, compromising nutritional preservation. The addition of microbial inoculants improved the fermentation process, ensuring proper preservation of silage. The intercropping of Tamani guinea grass with Stylosanthes cv. Bela resulted in higher dry matter production and improved the nutritional value of the silage, with increases of 3.46% in crude protein content, 20.96% in ADIP (acid detergent insoluble protein), 6.31% in soluble carbohydrates, and 10.06% in starch compared to the silage of Tamani guinea grass in monoculture. Therefore, the use of silage from intercropped Tamani guinea grass and Stylosanthes cv. Bela with the addition of inoculants can be recommended as a productive and sustainable practice, reducing costs associated with protein and mineral supplementation.