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This article in AJ

  1. Vol. 56 No. 6, p. 549-552
    Received: Dec 30, 1963

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Visual Estimation of Botanical Composition in Simple Legume-Grass Mixtures1

  1. G. C. Marten2



In 3 harvests of 20 legume-grass mixtures in 1962, the visual method consistently overestimated legume percentage in the spring harvest, but gave varying response in the aftermath harvests. However, significant correlations with each mixture and a highly significant overall correlation (r = 0.798) occurred between visual estimates and hand separation determinations of percentage legume. While visual estimates were biased in varying degrees with different species and varieties, the visual method had greater precision (less random error).

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