Alfalfa,Medicago sativa L., in highly weathered,acid soils |
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Authors: | J. H. Bouton J. K. Syers M. E. Sumner |
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Affiliation: | (1) Department of Agronomy, University of Georgia, 30602 Athens, GA, USA;(2) Present address: Dept. of Soil Science, Massey Univ., Palmerston North, New Zealand |
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Abstract: | Summary The effect of lime and P application on yield (top and root weigh), nodulation, intervally collected acetylene reduction (N2-fixation), and N and Al uptake of young alfalfa (46 days growth) were investigated in greenhouse pots containing acid Bladen or Bradson topsoils. The effect on seed germination and seedling persistence under these greenhouse conditions was also recorded.Alfalfa yield and acetylene reduction increased with lime and P additions in both soils, but, predominately, with P. There was no advantage of increasing these two parameters with liming past pH 6.0 provided P was adequate. Positive relationships (R2) existed between yield and acetylene reduction, and with both factors and root weight, nodule weight, and N uptake. Increased uptake of Al by alfalfa seedlings depressed yield, but data indicate P may block Al uptake at high soil pH. There were no treatment effects on seed germination, but P application increased plant persistence in the Bladen soil. |
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Keywords: | Acetylene reduction Acid soil Al uptake Liming N uptake Nodulation P application Plant persistence Root dry weight Seed germination Shoot dry weight |
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