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Nitrogen Use Efficiency in Vegetable Crops

Nitrogen Use Efficiency in Vegetable Crops. Laura L. Van Eerd , Ph.D., P.Ag. Ridgetown College, University of Guelph 519-674-1644. Methodology. Crops: Cucumbers Squash Peppers Carrots 3 sites for each crop RCBD 4 reps 6 to 8 treatments. Methodology. N treatments 0 N

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Nitrogen Use Efficiency in Vegetable Crops

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  1. Nitrogen Use Efficiency in Vegetable Crops Laura L. Van Eerd, Ph.D., P.Ag. Ridgetown College, University of Guelph 519-674-1644

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

  3. 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

  4. 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)

  5. Results – Marketable Yield

  6. Results – Crop N Uptake and Removal NUE = Pnf – Pn0 fertilizer applied

  7. Results – Soil Mineral N Ammonia-N Nitrate-N

  8. Cover Crops

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