Abstract
Low N use efficiency and high nitrate (NO -3 ) pollution potentials are problems in intensive vegetable production systems. The purpose of this study was to quantify N utilization by lettuce (Lactuca sativa L. cv Salinas), and identify periods of NO -3 loss in an on-farm study in the Salinas Valley in coastal California. During autumn and winter, surface moisture remained low, and NO -3 concentrations increased, reflecting high net mineralizable N, as determined by anaerobic incubation, and nitrification potential, as determined by the chlorate inhibition method. At the onset of a large winter storm, tracer levels of15NO -3 were injected in the top 5 mm of soil in 30 cm-deep cylinders. After two weeks, most of the15N was present as15NO -3 at 10–30 cm depth. By difference, losses to denitrification accounted for ~ 25% of the surface-applied15N. Leaching below 30 cm did not occur, since no15N enrichment of NO -3 -N was measured in anion-exchange resin membranes placed at the base of each cylinder. During the crop period, NO -3 losses were most pronounced after irrigation events. Uptake of N by two crops of lettuce (above- and belowground material) was approximately equal to fertilizer inputs, yet simulation of N fates by the Erosion/Productivity Impact Calculator (EPIC) model indicated losses of 14.6 g-N m−2 by leaching and 2.5 g-N m−2 by denitrification during the 6-month crop period. The large NO -3 losses can be attributed to accumulation of soil NO -3 during winter that was leached or denitrified during the irrigated crop period.
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Jackson, L.E., Stivers, L.J., Warden, B.T. et al. Crop nitrogen utilization and soil nitrate loss in a lettuce field. Fertilizer Research 37, 93–105 (1994). https://doi.org/10.1007/BF00748550
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DOI: https://doi.org/10.1007/BF00748550