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Nitrogen Use Efficiency in Vegetable Crops Laura L. Van Eerd, Ph.D., P.Ag. Ridgetown College, University of Guelph
Methodology Crops: –Cucumbers –Squash –Peppers –Carrots 3 sites for each crop RCBD –4 reps –6 to 8 treatments
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
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)
Results – Marketable Yield
Results – Crop N Uptake and Removal N Applied (kg N/ha) Crop Uptake (kg N/ha) Crop Removal (kg N/ha) (3.8) 27.5 (3.6) (5.7) 30.8 (2.7) (2.4) 31.9 (3.2) NUE (7.2) 8.6 (2.3) NUE = Pn f – Pn 0 fertilizer applied
Ammonia-N Results – Soil Mineral N Nitrate-N
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