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  • 1
    Electronic Resource
    Electronic Resource
    Alfalfa,Medicago sativa L., in highly weathered, acid soils (1981)
    Springer
    Plant and soil 59 (1981), S. 455-463 
    Details
    ISSN: 1573-5036
    Keywords: Acetylene reduction ; Acid soil ; Al uptake ; Liming ; N uptake ; Nodulation ; P application ; Plant persistence ; Root dry weight ; Seed germination ; Shoot dry weight
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02184549
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Alfalffa,Medicago sativa L., in highly weathered, acid soils (1981)
    Springer
    Plant and soil 60 (1981), S. 205-211 
    Details
    ISSN: 1573-5036
    Keywords: Acetylene reduction ; Acid soil ; K application ; Liming ; N2-fixation ; Nodulation ; P application ; Rhizobium meliloti ; Root dry weight ; Shoot dry weight
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Alfalfa plants,Medicago sativa L., were selected from the Florida 66 cultivar for vigor in an acid (pH 4.4, Al≥.4 meq/100 g) and a limed, fertilized (pH 6.5, Al=0 meq/100 g, P and K added) Cecil topsoil. The selected plants were intermated by selection condition to achieve two germplasms, acid selected (A-1) and limed, fertile selected (L-1). ARhizobium meliloti strain (79-4s) was isolated from a high acetylene reducing nodule from a plant in a similar acid soil. The germplasms and the Rhizobium strain were then tested in greenhouse pots for agronomic performance under a variety of soil pH and fertility conditions. The 79-4s inoculum, as well as commercially prepared inoculum, gave better plant yield and acetylene reduction (N2-fixation) at all harvests when compared to a sterile peat control, but the commercial inoculum was the best inoculum treatment. The A-1 germplasm produced higher shoot dry weight at the final harvest than did the L-1 germplasm at all soil pH’s when P and K were applied at the highest rates. The A-1 germplasm also had better root weight (mainly fibrous roots) and acetylene reduction in these soil conditions. The two germplasms appear to be genetically distinct and respond differently depending on soil pH and fertility conditions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02374105
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Alfalfa,Medicago sativa L., in highly weathered, acid soils (1982)
    Springer
    Plant and soil 65 (1982), S. 27-33 
    Details
    ISSN: 1573-5036
    Keywords: Acid soil ; Acid tolerant germplasm ; Liming ; Nodulation ; P application ; Root dry weight ; Top dry weight
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Seedlings of a broad based population of alfalfa, (Medicago sativa L.), were visually selected for 2 generations (cycles) in an acid Cecil soil (pH=4.8). Simultaneously, 2 generations of selections were made in a limed Cecil soil (pH=6.2) amended with phosphorus. When tested in acid soil (pH=4.8) with added P, the cycle 2 acid selections yielded significantly more top yield than either the limed selections or the original seed. When grown in the limed soil (pH=6.2) without added P, the acid selections yielded significantly less. There were no significant differences among selections in other soil conditions (pH=4.8, no P added and pH=6.2, P added). Root weight and length and nodule fresh weight correlated well with top yield in all treatments. The yield of the 10 parent varieties and polycrossed seed of their cycle 1 acid and cycle 1 limed selections were compared under two soil conditions (acid and limed). The results of this test indicate that some varieties were more responsive to acid soil selection than other. Overall, none of the 10 varieties showed any decreases in total top yield due to one cycle of selection in either the acid or limed soil conditions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02376800
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    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Alfalfa,Medicago sativa L., in highly weathered, acid soils (1983)
    Springer
    Plant and soil 74 (1983), S. 431-436 
    Details
    ISSN: 1573-5036
    Keywords: Al ; Liming ; Lucerne ; Mn ; N content ; P application ; Selection ; Top-growth
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Previous selection of alfalfa for productivity in acid soil resulted in germplasms with more acid soil tolerance, but which required high P levels to be responsive. In this investigation, the field performance of alfalfa germplasms (selected in either acid or limed soil conditions) was evaluated over three years at varying soil pH and P levels. Advancement made by selection in high and low yielding soil environments was also determined. Increasing soil pH from 4.8 to 7.2 increased alfalfa dry matter yield as did increasing P application from 80 to 200 kg P ha−1. At the acid end, levels of Al and Mn were not found to be toxic, but N content of tissue increased with increasing soil pH indicating better N2-fixation due probably to improved Mo availability. In one of the three years, the acid selections yielded significantly higher than the base population when data were pooled for all soil conditions, but there was no advantage in low pH soil. Acid selections were also more responsive than limed selections to P application over all pH levels. Acid soil selection appeared advantageous in increasing the productivity of alfalfa for use in high yielding environments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02181360
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    Paper (German National Licenses)
    Fulltext
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