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This article in JEQ

  1. Vol. 19 No. 4, p. 749-756
     
    Received: Nov 28, 1989
    Published: Oct, 1990


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doi:10.2134/jeq1990.00472425001900040019x

Long-Term Swine Lagoon Effluent Applications on ‘Coastal’ Bermudagrass: I. Yield, Quality, and Element Removal

  1. J. C. Burns *,
  2. L. D. King and
  3. P. W. Westerman
  1. U SDA-ARS, Dep. of Crop Sci. and Animal Sci., Raleigh, NC 27695;
    D ep. of Soil Sci., Raleigh, NC 27695;
    D ep. of Biological and Agric. Eng., North Carolina State Univ., Raleigh, NC 27695.

Abstract

Abstract

Swine (Sus scrofa domesticus) confinement systems that use anaerobic lagoons for waste collection in the humid regions require effluent removal during the year. Land area adjacent to the hog facility frequently becomes the site for continuous effluent distribution. The objective of this experiment was to determine the effect of long-term application of swine lagoon effluent to ‘Coastal’ bermudagrass [Cynodon dactylon (L.) Pers.] on dry matter yield, stand persistence, and nutrient concentration and removal. Effluent loading rates of low (L), medium (M), and high (H) approximating 335, 670, and 1340 kg of N ha−1 yr−1, respectively, were evaluated for 11 yr beginning in 1973 through 1983. The experiment was a randomized complete block with three replicates. Dry matter yields in Year 11 were altered by effluent loading rates with greater production from the M (19.0 Mg ha−1) or H (19.6 Mg ha−1) compared with the L (13.1 Mg ha−1). Although fluxes in stands occurred, they recovered completely as indicated by these yields. Higher concentrations of N, P, K, Mg, Cl, and Zn were present in forage in 1983 compared with 1973. Calcium was unchanged and Cu, Fe, and Na were less. In vitro dry matter disappearance of the forage was similar among loading rates (0.634) in 1983 and greater than in 1973 (0.553). Concentrations of NO3-N were higher in 1978 (1.14 g kg−1) compared with 1973 (0.87 g kg−1), but highest concentrations occurred in 1983 (1.57 g kg−1). By 1983, NO3-N concentrations of forages from the H loading rate approached or exceeded the toxic threshold in all summer harvests. Only the H loading (1340 kg ha−1) caused unstable stands and eventually produced forage that had NO3-N concentrations potentially toxic if fed as the sole ration to ruminants. Further, it resulted in disproportionally greater quantities of elements—especially N, P, K, Cl, and Na—that remained in the soil environment to become potential soil and soil-water pollutants.

Cooperative investigation of the USDA-ARS and the North Carolina Agric. Res. Service, Raleigh, NC. Paper no. 11755 of the Journal Series of the North Carolina Agric. Res. Service, Raleigh, NC 27695-7643.

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