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This article in SSSAJ

  1. Vol. 32 No. 3, p. 388-392
    Received: Oct 11, 1967
    Accepted: Jan 22, 1968

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Plant Uptake and Residual Value of Six Tagged Nitrogen Fertilizers1

  1. F. E. Broadbent and
  2. T. Nakashima2



Three ammonium-tagged fertilizers, two nitrate-tagged fertilizers, and N-tagged urea were added to three soils in green house pots. Plant uptake of surface-applied fertilizer N was measured by growing four crops over a period of 314 days. In another experiment, tagged ammonium sulfate, ammonium nitrate, and aqueous ammonia, were compared using band application. With surface application, uptake of fertilizer N in plant tops varied from 35 to 71%, with nitrate sources showing the higher values. Residual N in soil ranged from 18 to 41%, and its availability decreased with successive crops. All ammonium sources suffered some loss with surface application, especially aqueous ammonia, but losses were negligible with band application.

Availability of soil N was influenced to some extent by the nature of the fertilizer applied. From 5 to 13% of the soil N was utilized by four crops.

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