Influence of Placement on Uptake of Tagged Nitrogen by Rice1
- F. E. Broadbent and
- 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.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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