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This article in AJ

  1. Vol. 93 No. 6, p. 1344-1345
    Received: Jan 26, 2001

    * Corresponding author(s): bary@wsu.edu
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  1. Andy I. Bary *a,
  2. Dan M. Sullivanb,
  3. Steven C. Fransena and
  4. Craig G. Coggera
  1. a Washington State Univ. Puyallup Res. and Ext. Cent., 7612 Pioneer Way E., Puyallup, WA 98371-4998
    b Dep. of Crop and Soil Sci., Oregon State Univ., Corvallis, OR 97331


Small-plot research in manure nutrient management requires accurate manure applicators that are easy to operate and maneuver. Our objective was to design a small-plot liquid manure applicator that could apply variable rates of dairy manure containing up to 60 g kg−1 solids to perennial grass plots while avoiding traffic and compaction on the plots. The applicator consists of a 1000-L fiberglass agitation tank mounted on four load cells, a delivery pump and motor, and a side-mounted boom with four nozzles for manure application, all built onto a wagon and towed by a tractor. The side-mounted boom allows manure application without traffic on the plots. Manure application typically was within 7% of the target rate and had a coefficient of variation ranging from 2 to 17%, measured over a series of rates from 53 to 211 Mg ha−1 (wet weight). The precision, accuracy, and ease of operation of the applicator met our research requirements. Efficiency of operation could be improved using a larger agitation tank.

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Copyright © 2001. American Society of AgronomyPublished in Agron. J.93:1344–1345.