Integrated biofertilization strategy for greenhouse tomato cultivation

Overview

Excessive reliance on chemical fertilizers imposes significant economic and environmental costs on agricultural systems. AGROSAVIA is developing an integrated fertilization strategy for greenhouse tomato cultivation that replaces or supplements synthetic inputs with plant growth-promoting rhizobacteria (PGPR) biofertilizers, mycorrhizal inoculants, and composted organic amendments. The approach leverages beneficial soil microorganisms that form symbiotic relationships with plants, mobilizing nutrients in exchange for carbon fixed through photosynthesis. By maintaining production yields while reducing input costs, this strategy offers Colombian tomato producers a more sustainable and economically viable path forward.

Technical specifications

Core components of the strategy:

• PGPR-based biofertilizers containing plant growth-promoting bacteria developed through AGROSAVIA's applied microbiology research programs
• Mycorrhizal inoculants to enhance root nutrient uptake efficiency
• Composted organic amendments to improve soil structure and biological activity
• Reduced chemical synthesis fertilization as a complementary input rather than primary nutrition source

Mechanism of action:

• Bidirectional nutritional exchange between plant roots and soil microorganisms
• Plants contribute up to 20% of photosynthetically fixed carbon to associated microbes
• Microorganisms mobilize otherwise unavailable soil nutrients for plant uptake
• Documented productivity gains of up to 50% under greenhouse conditions and 30% in experimental plots with biofertilizer use

Validation protocol:

• Seven treatments evaluated in randomized complete block design with five repetitions each
• Libertador tomato hybrid seedlings (~30 days old) transplanted into ~2,000 m² greenhouses at CI Tibaitatá, Mosquera, Colombia
• Evaluation variables include production yield, plant physiology, soil and plant microbiome dynamics, and post-harvest quality

Technology readiness level

This research is at the field validation stage. Prior laboratory and applied research at AGROSAVIA has established the biological basis and demonstrated productivity improvements in multiple crops. The current greenhouse trial at CI Tibaitatá represents a critical step toward confirming that an integrated fertilization package can match conventional yields while reducing chemical inputs and production costs. Results from this validation will inform recommendations for tomato producers and potential technology transfer to other greenhouse cropping systems across Colombia's diverse agroecological zones.