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Some Effects of Beef-Feedlot Effluent Applied to Forage Sorghum Grown on a Colo Silty Clay Loam Soil¹

ABSTRACT

Beef-feedlot effluent and water additions to a forage sorghum [Sorghum bicolor (L.) Moench] were compared for two consecutive growing seasons. Applications of each at 2.5 and 5.0 cm/week were made in 1971 and 1972 for 11 and 10 weeks, respectively.

The 2.5-cm/week effluent application produced the highest forage yield in both years of the study, with the yield being significantly higher in 1972. In 1972, the lower 30 cm of the forage stalks (butts), receiving 5 cm of effluent/week, showed significantly greater NO₃-N than the other treatments. The application of beef-feedlot effluent did not affect the concentrations of Ca, Mg, Na, and K in the forage during the 2-year study.

After 2 years of effluent application at 5.0 cm/week, available P in the top 10 cm of soil increased from 52 to 118 ppm; soil pH increased from 6.2 to 6.6. Electrical conductivity changes were not significant. Soil solution samples collected from plots receiving the effluent treatments showed only small increases in Ca, Na, and K, 60 cm below the soil surface. Soil solution NO₃-N was higher beneath the plots receiving 2.5 cm effluent/week than beneath the 5.0-cm effluent/week treatment.

Key Words: soil solution • NO₃-N • cations • phosphorus • pH

¹ Contribution from the Nebraska Agr. Exp. Sta. and the North Central Region, ARS, USDA. This research was funded partially by the U. S. Environmental Protection Agency. Published as Paper No. 3685, Journal Series, Nebraska Agr. Exp. Sta., Lincoln.

² Former Research Assistant, University of Nebraska; Microbiologist and Supervisory Agricultural Engineer, USDA, Lincoln, Nebraska, respectively

Received for publication February 1, 1974.