Leveiulla taurica Oidium neolycopersici Passalora fulva.

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Presentation transcript:

Leveiulla taurica Oidium neolycopersici

Passalora fulva

Optimal Nitrogen levels in high tunnel tomatoes:

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.

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.

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.

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.

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.

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.