Advancing Perennial Cover Crops for Sustainable Orchard and Vineyard Management

Commodities

• Fruits: apples, grapes, peaches

Practices

• Crop Production: cover crops
• Education and Training: decision support system, extension
• Natural Resources/Environment: soil stabilization
• Pest Management: mulches - living
• Soil Management: soil quality/health

Project Focus

Northeast orchard and vineyard growers are challenged by declining soil function, herbicide resistant weeds, and labor and input costs associated with herbicide and pruning. In juxtaposition to spraying herbicide, perennial, low‑growing cover crops (CCs) planted directly in the crop row have the potential to address these challenges. Perennial CCs can improve soil health, reduce erosion and chemical leachates, moderate excessive vigor, and suppress weeds, thus eliminating applications. However, adoption remains low because practice outcomes are highly context dependent. Research from vineyards shows that crop age, soil resource availability, and CC variety can determine whether competition reduces yield or whether benefits accumulate without yield reductions. Although growers are motivated to transition away from herbicide‑intensive systems, they currently lack decision frameworks and management recommendations that translate research findings into actionable, site‑specific guidance. Moreover, crop-row CCs remain undertested in northeastern orchards. The result is that uncertainty and perceived risk have limited application of this sustainable practice.

Solution and Approach

To increase adoption of perennial CCs in orchards and vineyards, we will develop a decision‑support tool that helps growers evaluate risk and select appropriate CCs for their site. Tool development will be informed by previous research, novel vineyard and orchard trials, economic analysis, and grower input to ensure that recommendations are both evidence‑based and practical. Farmer engagement is embedded throughout the project: trials will take place with grower‑cooperators, a grower‑led advisory committee will guide research and outreach decisions, and outreach and feedback will run concurrently with tool development.

Research Question 1: Which cover crop varieties and planting configurations best meet grower goals?
We will quantify competition risk, crop responses, and soil health across complementary studies. An on‑farm mature orchard variety trial (eight treatments) will estimate impacts on tree performance, weed suppression, and soil indicators under commercial conditions. An herbicide‑strip width trial in a two‑year‑old peach orchard will determine thresholds where competition becomes unacceptable during young-crop establishment. A greenhouse experiment will measure CC traits across field‑tested and several candidate varieties, expanding recommendations to species not yet evaluated in the field.

Research Question 2: What are the economic implications over time?
Because perennial fruit systems accumulate costs and benefits across many seasons, we will integrate new orchard data with measurements from a decade‑long vineyard CC experiment. Partial budget analyses will provide estimates of short‑ and long‑term profitability.

Research Question 3: Can a risk‑assessment framework increase adoption and success?
Findings from Questions 1 and 2, combined with prior studies, will support development of a decision-support tool that ranks CCs by relative risk using crop age, site conditions, and grower objectives. Two to three vineyard demonstration sites will beta‑test recommendations alongside standard practice, with structured grower feedback guiding refinements to the tool.

Question 1: Which cover crop varieties and planting configurations best meet grower goals?
Because few CC options have been tested, we will assess competitive ability, fruit crop impacts, and soil‑health benefits of common, novel, and mixed species in an on‑farm orchard trial and a greenhouse study. We expect smaller‑rooted species and/or legumes to minimize risk, with soil‑health gains varying by species/mixtures. To assess the risk of the practice to young orchards, we will examine herbicide‑strip width gradients with the expectation that risk increases with decreasing strip width.

Question 2: What are the economic implications over time?
Given the long-lifespan of vineyards and orchards and that the benefits of the practice accrue over time, we will conduct a partial budget analysis to quantify potential cost-savings with the practice.

Question 3: Can a risk‑assessment framework increase adoption and success?
Novel findings from Questions 1 and 2, combined with prior regional studies in vineyards, will support development of the CC decision-support tool. A preliminary version will be tested and refined through 2-3 vineyard demonstrations.

These efforts will result in a CC decision-support tool that reduces uncertainty and increases practice adoption, leading to improvements in soil health, input efficiency, and long‑term profitability.