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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Plant and soil 147 (1992), S. 163-170 
    ISSN: 1573-5036
    Keywords: boron injury ; boron tolerance ; Cucurbita moschata ; Cucurbita pepo ; fruit yield ; mineral composition ; soil solution ; squash
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract The boron tolerance of two summer squash cultivars (Cucurbita pepo L. ‘Aristocrat Zucchini’ and ‘Peter Pan Scallop’) and one winter squash cultivar (Cucurbita moschata Poir. ‘Butter boy’) was determined in large, outdoor sand cultures. Boron treatments were imposed by irrigation with culture solutions that contained 1.0, 3.0, 6.0, 9.0, 12.0, or 15.0 mg B L-1. Relative fruit yields of ‘Zucchini’, ‘Scallop’, and ‘Butter boy’ were reduced 5.2%, 9.8%, and 4.3% with each unit (mg L-1) increase in soil solution B (Bsw)〉2.7, 4.9, and 1.0 mg B L-1, respectively. Reduced yields of all cultivars were attributed to a reduction in fruit number and not fruit size. Boron concentrations in leaves and fruit were directly correlated to Bsw.
    Type of Medium: Electronic Resource
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  • 2
    Publication Date: 2019-08-17
    Description: A numerical model describing the coupled evolution of the biogeochemical cycles of carbon, sulfur, calcium, magnesium, phosphorus, and strontium has been developed to describe the long-term changes of atmospheric carbon dioxide and climate during the Phanerozoic. The emphasis is on the effects of coupling the cycles of carbon and strontium. Various interpretations of the observed Phanerozoic history of the seawater 87Sr/86Sr ratio are investigated with the model. More specifically, the abilities of continental weathering, volcanism, and surface lithology in generating that signal are tested and compared. It is suggested that the observed fluctuations are mostly due to a changing weatherability over time. It is shown that such a conclusion is very important for the modelling of the carbon cycle. Indeed, it implies that the conventional belief that the evolution of atmospheric carbon dioxide and climate on a long time scale is governed by the balance between the volcanic input of CO2 and the rate of silicate weathering is not true. Rather carbon exchanges between the mantle and the exogenic system are likely to have played a key role too. Further, the increase of the global weathering rates with increasing surface temperature and/or atmospheric CO2 pressure usually postulated in long-term carbon cycle and climate modelling is also inconsistent with the new model. Other factors appear to have modulated the weatherability of the continents through time, such as mountain building and the existence of glaciers and ice sheets. Based on these observations, a history of atmospheric carbon dioxide and climate during Phanerozoic time, consistent with the strontium isotopic data, is reconstructed with the model and is shown to be compatible with paleoclimatic indicators, such as the timing of glaciation and the estimates of Cretaceous paleotemperatures.
    Keywords: Exobiology
    Type: American journal of science (ISSN 0002-9599); 292; 81-135
    Format: text
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