Sustainable Cantaloupe in Semi-Arid Colorado: Revising Irrigation and Harvest Practices to Reduce Water Use and Contamination Risk

Commodities

• Agronomic: annual ryegrass, buckwheat, triticale
• Fruits: melons

Practices

• Crop Production: cover crops, cropping systems, food product quality/safety, irrigation, postharvest treatment, water management
• Education and Training: decision support system, demonstration, extension, on-farm/ranch research, workshop
• Pest Management: mulching - vegetative, mulching - plastic
• Soil Management: soil quality/health
• Sustainable Communities: community development, local and regional food systems

Cantaloupe production in Colorado's Rocky Ford-La Junta region faces overlapping sustainability and food-safety challenges driven by limited water, high labor costs, and contamination concerns during harvest and postharvest handling. Conventional furrow irrigation requires high water inputs and multiple hand harvest events, after which fruit is washed in centralized systems that can promote cross-contamination and shorten shelf life. This two-year project at Colorado State University's Arkansas Valley Research Center (AVRC), with postharvest validation at the CSU Spur Campus, will evaluate integrated practices that reduce water use, lower microbial risk, and improve fruit quality and profitability. A field experiment will compare drip and furrow irrigation combined with plastic mulch or roller-crimped cover crops of buckwheat, triticale, and rye. Controlled field inoculations will use Listeria innocua containing antibiotic markers that allow detection and differentiation from naturally occurring strains on soil, water, and plant surfaces. MicroTally Mitt sampling will capture field variability and provide standardized estimates of Listeria persistence under each management practice. Representative fruit will be transported to the Spur Fresh-Cut Facility, where peeling, cutting, and washing trials will validate peracetic acid and chlorine contact-time tables and evaluate Listeria survival during 15 days of storage. Sustainability indicators such as soil moisture, irrigation volume, yield, and fruit-quality attributes will quantify trade-offs between production efficiency and microbial risk reduction. A bilingual education program with a field day, webinar, pamphlet, and short video will provide applied training for growers and workers and support Western SARE's goals for environmental, economic, and social sustainability.

Objectives

1. O1: Integrating roller-crimped cover crops (buckwheat, triticale, rye) with drip irrigation will reduce water use and splash-mediated Listeria innocua transfer to fruit surfaces compared to furrow irrigation systems.
2. O2: Plastic mulch treatments will further limit soil contact, shorten harvest duration, and improve fruit quality and shelf life.
3. O3: Adoption of field-pack and forced-air-cooling workflows will preserve fruit quality while minimizing postharvest cross-contamination risks.