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  • 1995-1999  (2)
  • 1997  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Influence of pruning frequency of Albizia lebbeck, Gliricidia sepium and Leucaena leucocephala on nodulation and potential nitrogen fixation (1997)
    Springer
    Biology and fertility of soils 24 (1997), S. 255-260 
    Details
    ISSN: 1432-0789
    Keywords: Key words N2 fixation ; Pruning ; Leucaena ; leucocephala ; Gliricidia sepium ; Albizia lebbeck ; Alley cropping ; Hedgerows ; Tree nodulation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract The influence of four pruning frequencies on biomass, nodulation and N2 fixation was investigated on Albizia lebbeck, Gliricidia sepium and Leucaena leucocephala grown in the screenhouse for 16 months, using acetylene reduction and 15N dilution methods. Frequent prunings at 4-month intervals had no deleterious effect on symbiotic N2 fixation, which increased in Gliricidia and Leucaena in particular. Nodulation and nitrogenase activity varied inconsistently within species, and were not influenced by pruning frequency. Cumulative assessment of pruning effect showed higher biomass, N yield and N2-fixing capacity of the woody species than at last harvest, and appeared to have more practical relevance. Across species, cumulative total dry matter, N yields, and both percentage and absolute amount of N2 derived from atmosphere increased with pruning frequency, except when trees were pruned 3 times. Of the three species, G. sepium had the lowest biomass production, N2 fixation and N accumulation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003740050240
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Effect of tree pruning and pruning application to trees on nitrogen fixation by Leucaena and Gliricidia (1997)
    Springer
    Agroforestry systems 39 (1997), S. 117-128 
    Details
    ISSN: 1572-9680
    Keywords: green manure ; mulch ; pruning ; woody legumes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract A microplot study was conducted with Leucaena leucocephala and Gliricidia sepium to determine the effect of pruning the trees and applying the prunings to the soil (as either surface mulch or soil-incorporated green manure) on N2 fixation by the trees. N2 fixation was estimated by the 15N dilution method, and the non-N2-fixing species Senna siamea was used as a reference species. Number and dry weight of nodules were reduced with applications of prunings in Leucaena, and increased in Gliricidia. For both species, the lowest rate of N2 fixation (47%) occurred under green manure incorporation after pruning, and the highest (66%) with mulching and no-pruning. Incorporation of green manure into soil significantly depressed N2 fixation by 19.1% in Gliricidia and 20.6% in Leucaena compared to no-pruning treatment. The deleterious effect of incorporation of prunings into soil also affected the amount of N2 fixed. During the nine months following pruning, green manure incorporation steadily decreased the percentage of N2 fixed, whereas with no-pruning, pruning only and pruning with mulching, N2 fixation increased with time. Reduction of N2 fixation in pruned plants could imply that they would compete for N with interplanted food crops, causing lower N use efficiency by the latter. Despite lower dry-matter and N yields of Leucaena as compared with Gliricidia, its biological N2 fixation amounted to 73% of its N requirement as opposed to the corresponding figures of 50% for Gliricidia.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1005957206624
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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