Boosting Biomass with Organic Fertilizer in Urochloa Pastures | Colombian Amazon Study

Introduction

The Colombian Amazon, a region of immense biodiversity and ecological importance, presents unique challenges and opportunities for sustainable agriculture. This study focuses on the integration of organic fertilization into pasture systems, particularly those involving Urochloa spp., a key forage grass in tropical livestock production. By examining the effects of organic inputs on both biomass production and soil health, the research aims to contribute to climate-smart practices that enhance productivity while preserving the Amazon’s fragile ecosystems.

Organic Fertilization as a Sustainable Input

Organic fertilization offers a viable alternative to synthetic fertilizers, promoting soil fertility through natural nutrient cycling. In this study, the application of organic matter—such as compost and manure—demonstrated significant impacts on pasture productivity. The use of organic inputs not only supplies essential macro- and micronutrients but also improves soil structure, microbial activity, and long-term fertility, making it a cornerstone of sustainable pasture management.

Biomass Production in Urochloa spp. Pastures

Urochloa species are widely cultivated for their adaptability and high forage yield. The research revealed that organic fertilization significantly boosted above-ground biomass in these pastures, supporting increased livestock feed availability. Enhanced biomass production also indicates improved photosynthetic activity and root development, which in turn strengthens soil cover, reducing erosion and nutrient loss in tropical conditions.

Impact on Soil Biological Properties

Soil biological health is crucial for nutrient cycling and plant growth. The study showed that organic fertilization increased microbial biomass, enzyme activity, and overall biological diversity in the soil. These changes foster a more resilient soil ecosystem capable of withstanding environmental stressors. The enhanced microbial communities contribute to decomposition processes, nitrogen fixation, and disease suppression.

Changes in Soil Physical Properties

Organic fertilization was also found to improve critical soil physical parameters such as porosity, water retention, and bulk density. These improvements facilitate better root penetration and water infiltration, directly supporting plant growth. In the Colombian Amazon, where heavy rainfall and leaching are common, such enhancements help maintain productive and erosion-resistant soils.

Agroecological Implications and Future Prospects

The integration of organic fertilization into Urochloa-based pasture systems presents a promising pathway for ecologically balanced livestock farming in the Amazon. This approach supports biodiversity, reduces dependency on chemical inputs, and aligns with global sustainability goals. Future research could explore long-term effects, economic viability, and potential for scaling these practices across other tropical regions.