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This article in AJ

  1. Vol. 76 No. 1, p. 13-16
     
    Received: May 20, 1983


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doi:10.2134/agronj1984.00021962007600010004x

Soil Fertility and Defoliation Effects with Arrowleaf Clover and Nitrogen Fertilizer Equivalence of Crimson-Arrowleaf Clover Combinations

  1. J. Q. Lynd,
  2. E. A. Hanlon and
  3. G. V. Odell1

Abstract

Abstract

Arrowleaf clover (Trifolium vesiculosum Savi) has promise as an improved forage legume that is compatible with both warm and coolseason grass species. The objective of these studies was to evaluate factors influencing the potential of ‘Yuchi’ arrowleaf clover for high forage productivity with desirable symbiotic N2 fixation. Effects of soil fertility and defoliation on arrowleaf clover growth, tillering, nodulation and nitrogenase activity (C2H2 reduction) were determined for a 3-year period. Relative N2 fixation as fertilizer N equivalence (FNE) was determined with a combination of arrowleaf and crimson clover (Trifolium incarnatum L.), interseeded with rye (Secale cereale L.). Arrowleaf top growth, number of tillers, nodule mass, and nitrogenase (C2H2 reduction) increased with defoliation and P, K, and Ca fertility treatments in 3 years of field experiments on a Port silt loam (fine, silty, mixed, thermic Cumulic Haplustoll). Phosphorus was the first limiting factor. Fertilizer N equivalence of arrowleaf alone was 50 kg N ha−1, with combined arrowleaf and crimson clover having an FNE of 89 kg N ha−1 compared to NH4NO3 fertilization for increased rye yield. Residual N fixed by the clovers increased subsequent monocultured rye yield equivalents to an FNE 111 kg N ha−1 for arrowleaf clover alone and an FNE of 121 kg N ha−1 for combined arrowleaf and crimson clovers.

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