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Plant Uptake and Residual Value of Six Tagged Nitrogen Fertilizers¹

ABSTRACT

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.

¹ Contribution from the Department of Soils & Plant Nutrition, University of California, Davis. The research of this project was conducted in cooperation with the Tennessee Valley Authority.

² Professor of Soil Microbiology and Laboratory Technician, respectively.

Received for publication October 11, 1967. Accepted for publication January 22, 1968.