An extremely small diameter coring device may not cut or represent the leaf-stem ratio properly, and a very large diameter probe may obtain a too-large sample which is difficult for labs to grind properly. Diameter should be between 3/8" and 5/8". No part of the sample (eg leaves or stems) should be lost when the probe is withdrawn from the bale (as it is with open augers). Probes should satisfy a number of criteria: they must fairly represent the leaf/stem ratio of the bales, they should sample deeply enough to represent the variation within bales, the tips should be kept sharp, and tips are recommended to be at 90° to the shaft (not cut at an angle). There are a wide range of acceptable coring devises, each with advantages and disadvantages. The choice of either power-driven or hand-powered probes can be used in an integrated sampling program which includes taking at least 20 cores, sampling at 90 to the but ends of bales, sampling about 18 inches into the bale, and proper sample handling. of Agronomy & Range Science, University of California, Davis, CA 95616 IntroductionĬhoosing a proper hay probe is an important component of proper forage testing technique. Vance Owens, Ag Hall Box 2207A, South Dakota State University, Brookings, SD 57007-1096 of Agronomy & Range Science, University of California, Davis, CA 95616
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