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This article in AJ

  1. Vol. 60 No. 6, p. 674-677
    Received: Apr 19, 1968

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Influence of Placement on Uptake of Tagged Nitrogen by Rice1

  1. F. E. Broadbent and
  2. D. S. Mikkelsen2



The placement of two N-15 tagged fertilizer sources applied to lowland rice was studied to determine the effects on yield components, fertilizer N uptake and the residual N present after cropping. Tiller number and bearing tillers were increased by fertilization, but the source and placement had no effect. Grain yield was increased by N fertilization with ammonium sulfate and urea but was not affected by source. Broadcast applications gave lower yields than other treatments while the highest yields were obtained with half the N placed in the soil and the balance top-dressed. Fertilizer N in the Y-leaf and total plant uptake showed the superiority of banding with variations in total N uptake varying from 26 to 47%. Ammonium sulfate provided a larger increment of N to grain production than urea and also showed a lower magnitude of N loss from the soil-plant system.

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