Nitrogen Use Efficiency in Vegetable Crops

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Nitrogen Use Efficiency in Vegetable Crops

• Laura L. Van Eerd, Ph.D., P.Ag.
• Ridgetown College, University of Guelph
• 519-674-1644

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Methodology

• Crops
• Cucumbers
• Squash
• Peppers
• Carrots
• 3 sites for each crop
• RCBD
• 4 reps
• 6 to 8 treatments

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Methodology

• N treatments
• 0 N
• Low (35 65 kg N ha-1)
• OMAF recommendation
• High (1.5x OMAF)
• Very high (2x OMAF)
• Split (Low x OMAF rec.)
• UMAXX from Agrotain

Cucumbers 0 65 110 165 220 65 45 110
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Data Collection

• Soil sampling
• Pre-site analysis (soil characteristics)
• 2 week after treatment (mineral N)
• At split application (mineral N)
• Plant sampling
• At split application (nitrate)
• Harvest
• Marketable yield
• Soil (mineral N)
• Shoot and fruit ( total N)

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Results Marketable Yield
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Results Crop N Uptake and Removal
NUE Pnf Pn0 fertilizer applied
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Results Soil Mineral N
Ammonia-N

• Nitrate-N

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Cover Crops