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This article in AJ

  1. Vol. 63 No. 1, p. 126-129
     
    Received: June 20, 1970
    Published: Jan, 1971


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doi:10.2134/agronj1971.00021962006300010039x

Nitrate Accumulation in Vegetables, I. Spinach Grown in Upland Soils1

  1. A. V. Barker,
  2. N. H. Peck and
  3. G. E. MacDonald2

Abstract

Abstract

The nitrate concentrations in spinach (Spinacia oleracea L.) blades and petioles were determined for different sources and times of application of N fertilizers to a Honeoye fine sandy loam and a Lima silt loam to determine the effect of N fertilization on the concentration of nitrates in the plant parts used for consumption for food.

Nitrate concentrations were determined potentiometrically, using a nitrate-selective ion electrode, on plant samples taken at time intervals after N fertilization and at harvest stage for processing. Nitrogen fertilization substantially increased the NO3 concentrations of spinach grown in upland soils. The following observations were significant: (a) More NO3 accumulated in leaves of plants broadcast with N fertilizers before planting than if an equivalent amount of N fertilizer was supplied by sidedressing one week before harvest. (b) The N carrier was a significant factor in governing NO3 accumulation when it was applied as sidedressing.

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