Some Effects of Beef-Feedlot Effluent Applied to Forage Sorghum Grown on a Colo Silty Clay Loam Soil1
- J. E. Sukovaty,
- L. F. Elliott and
- N. P. Swanson2
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.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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