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  • 1
    ISSN: 1573-5036
    Keywords: Fe toxicity ; highland swamp ; Histosol ; Mn ; leaf mineral content ; organic carbon ; peat ; rice ; soil pH
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Iron toxicity is suspected to be a major nutritional disorder in rice cropping systems established on flooded organic soils that contain reductible iron. A pot trial was carried out to assess Fe toxicity to rice in flooded Burundi highland swamp soils with a wide range of organic carbon contents. Soil and leaf analyses were performed and total grain weight was determined. Clear Fe toxicity was diagnosed, based on leaf Fe content at panicle differentiation. Leaf Fe contents higher than 250 μg g−1 dry matter induced lower Mg (and probably Mn) uptake, and a 50% total grain weight reduction. These features were associated with exchangeable Fe equivalent fractions higher than 86%. Besides, several non-Fe toxic soils exhibited an Mg-Mn imbalance.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Human evolution 8 (1993), S. 281-289 
    ISSN: 1824-310X
    Keywords: Hominids ; Recognition Concept of Species ; Specific Mate Recognition System ; Postcrania
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The Recognition Concept of Species is examined for its potential usefulness in discriminating speciation events in the hominid fossil record. Controversies over species-specific characteristics amongHomo erectus and archaicHomo sapiens have centred on traits of the skull, largely because this element is most commonly preserved. Modern humans have an intuitive knowledge of their own Specific Mate Recognition System (SMRS), and therefore have the opportunity to compare their own SMRS to that of fossil hominids and the extent pongids. Such comparison suggests that our own skeletal SMRS may depend less on features of the skull than on the morphology of the postcranial anatomy. We propose that these components be further examined in this regard. We tentatively conclude that examination of the Recognition Concept of Species indicates that from lateHomo erectus onwards, the same SMRS has been shared in common by all hominids, including modernHomo sapiens. This suggests that, following the SMRS criterion, none of these forms can be categorized as separate species.
    Type of Medium: Electronic Resource
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