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Published byMillicent Byrd Modified over 8 years ago
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Leveiulla taurica Oidium neolycopersici
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Passalora fulva
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Optimal Nitrogen levels in high tunnel tomatoes:
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Farm A Nitrogen Management Strategy: 100% of N applied pre-plant Slow release material (feather meal) No response to falling N levels on foliar test results. Result: Nitrogen falls below optimal levels and never recovers.
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Farm B Nitrogen Management Strategy: All-purpose N injected through drip line at a pre determined rate. Abiotic stress set plants back (cold, soil compaction) N rate was not adjusted despite falling levels Result: Nitrogen falls below optimal levels during fruiting and recovers after main harvest.
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Farm C Nitrogen Management Strategy: All-purpose N injected through drip line at variable rates throughout the season. 2 nd year tunnel grower responding directly to each foliar sample result Result: Grower spends the season playing catch up, N levels stay within recommended levels.
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Farm D Nitrogen Management Strategy: Plant and animal manure based compost applied pre-plant, additional N source applied mid-season when foliar tests showed N levels dropping. Result: Growers response to foliar test results prevent sub-optimal nitrogen levels.
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Farm E Nitrogen Management Strategy: Plant and animal manure based compost applied pre-plant, additional N source applied mid-season when foliar tests showed N levels dropping. Result: Growers response to foliar test results prevent sub-optimal nitrogen levels.
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Farm F Result: Nitrogen levels stay above recommended levels all season long. Nitrogen Management Strategy: Multiple greenhouse grade fertilizers injected through drip line at variable rates throughout the season.
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