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Nitrogen Availability from Potato-Processing Wastewater for Growing Corn¹

ABSTRACT

A line source sprinkler was used to irrigate corn (Zea mays L.) plots with potato (Solanum tuberosum L.)-processing wastewater in 1979, 1980, and 1981. Nitrogen applications ranged from about 4 to 600 kg/ha. Corn yields were measured for each row, the grain and stalks were analyzed for total N, and N uptake was calculated. The plots were split by years, one-third of the area was fertilized with wastewater 3 y, one-third 2 y, and one-third 1 y. This allowed evaluation of current and residual value of wastewater fertilization. Corn responded well to wastewater fertilization, with N applications in the wastewater increasing corn yields with increasing increments of N up to about 200 to 250 kg/ha annually, and corn grain yields ranged up to about 12 Mg/ha. Yield comparisons were made with plots fertilized with ammonium nitrate fertilizer. We determined that potato-processing wastewater N was almost equal to ammonium nitrate N for growing corn. Wastewater applications that will apply approximately 200 to 250 kg N/ha annually should be optimum for growing corn on this soil. Wastewater N from potato processing has good residual and carry-over for 1 y but under conditions of this experiment did not carry over for more than 1 y. Whether the excess N was lost from denitrification or leaching was not determined.

Key Words: line source sprinkler • residual nitrogen • corn grain

¹ Contribution from the USDA-ARS Snake River Conserv. Res. Center, Kimberly, ID 83341, in cooperation with the Idaho Potato Commission and the J. R. Simplot Co. Food Div., Caldwell, ID.

² Soil Scientist and Biological Technician (Soils), retired, respectively.

Received for publication April 29, 1983.

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