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Description
Quantities of nitrogen (N) traditionally applied to lettuce fields by commercial growers range from lows of 80 to 120 lbs N/A (commonly 800 to 1200 lbs of 8-32-16 or 10-20-20) to rates as high as 250 lbs N/A. The higher rates are attained by supplementing the principal application of N-P-K with ammonium nitrate. Fertilization response research conducted elsewhere suggests that the higher rates are well beyond quantities of N required for maximum yields; however grower experience indicates that the additional N indeed does increase head size and yields, especially in late season plantings when cooler soil temperatures may reduce N uptake. Optimal rates of N to be applied can differ depending upon application rate during the previous year and carryover of N in the soil. Questions remain as to what soil N concentration is required for optimal yield under Alaskan conditions. The field experiment reported here was conducted to assess the effects of increasing rates of N fertilization on lettuce yields and soil N concentrations. Although preliminary, these data may be helpful to growers deciding N application rates.
Publication Date
6-17-1987
Recommended Citation
Carling, D.E.; Michaelson, G.J.; and Ping, C.L., "The Effect of Nitrogen Fertilization Rates on Head Lettuce Yields: A Preliminary Report" (1987). Research Progress Reports. 5.
https://ualaska.researchcommons.org/uaf_afes_progress_reports/5
Handle
http://hdl.handle.net/11122/2241