Nutrient Management Research Database
General Information
Research Title
Evaluating and Demonstrating the Effectiveness of In-Field Nitrate Testing for Drip and Sprinkler Irrigated Vegetables
Research Specifications
Crop: Broccoli, Cabbage, Celery, Lettuce, Onion, Peppers
Soil Type: Variable
County, State: (San Benito, Santa Clara),
Year: 2001
Authors
Buchanan, M
Summary/Abstract from Original Source
Research Highlights
Design and Methods
- In the 1990s, over half of wells in the Llagas basin had nitrate levels above 45 ppm.
- Reducing rate of fertilizer application is not feasible without properly performed testing to ensure yield penalties are avoided.
- This study examined the utility of in-season soil and plant tissue nitrate testing in crafting and modifying nutrient management plans.
Results
- The most important factors influencing soil nitrate levels and distribution in the soil were irrigation type, irrigation and fertilization scheduling, soil texture, crop growth stage, and crop conditions.
- Soil nitrate ‘quick testing,’ performed on-farm by growers is an effective tool to measure residual soil N, and useful to tweak nutrient management plans mid-season.
- The results of this study suggest that growers have an opportunity to reduce N fertilization without yield penalties, though specific rates depend on the conditions mentioned above.
Additional Information
Tags (links to other subject matter in database)
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- Efficient Phosphorus Management in Coastal Vegetable Production (Monterey, San Benito, Santa Clara, Santa Cruz)
- Vegetable Production Best Management Practices to Minimize Nutrient Loss (Monterey, San Benito, Santa Clara, Santa Cruz)
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