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  • Artikel  (10)
  • Artikel: DFG Deutsche Nationallizenzen  (10)
  • Zinc  (10)
  • 1980-1984  (10)
  • 1925-1929
  • 1983  (10)
  • 1928
  • 1925
  • Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft  (10)
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  • Artikel  (10)
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  • Artikel: DFG Deutsche Nationallizenzen  (10)
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  • 1980-1984  (10)
  • 1925-1929
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  • Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft  (10)
  • 1
    Digitale Medien
    Digitale Medien
    In situ immobilization of heavy metals with tetraethylenepentamine (tetren) in natural soils and its effect on toxicity and plant growth (1983)
    Springer
    Plant and soil 70 (1983), S. 37-47 
    Details
    ISSN: 1573-5036
    Schlagwort(e): Cadmium ; Cation exchange ; Copper ; Heavy metals ; Illite clay ; Nickel ; Organic matter ; Tetraethylenepentamine ; Tetren ; Transition metal complexes ; Zinc
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
    Notizen: Summary The ion exchange behavior of heavy metals (Cu, Zn, Ni, Cd) in soils is shown to be strongly influenced by complex formation with tetraethylenepentamine (tetren). In a heavy clay (illite) soil, the metal (complex) concentration in the equilibrium solution is lowered by some two orders of magnitude, as compared to the aqueous metal ions. In a sandy loam, in which the exchange properties are nearly exclusively due to organic matter, the addition of tetren leads to a significant increase of the metal (complex) in solution. These effects are interpreted in terms of the high adsorption selectivity of the metal complexes for clay particles (illite clay) and the competition of tetren with the chelating groups of the humic fraction (sandy loam). In this case the resulting tetren complexes remain in solution and can be immobilized by addition of small amounts of clay to such a soil.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02374748
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  • 2
    Digitale Medien
    Digitale Medien
    Soil moisture influence on micronutrient cation availability under aerobic conditions (1983)
    Springer
    Plant and soil 72 (1983), S. 77-83 
    Details
    ISSN: 1573-5036
    Schlagwort(e): Copper ; Gezira soils ; Iron ; Micronutrient availability ; Microbial activity ; Manganese ; Oxidation ; Zinc
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
    Notizen: Summary The three major soil series comprising the Gezira scheme (Sudan) are Hosh, Suleimi, and Laota. Surface soil samples from each soil series were employed to study the effect of soil moisture on the DTPA-extractable micronutrient cation under aerobic conditions. The study continued for 8 weeks using an incubation technique at two levels of soil moisture (continuously moist and moist/dry cycles). The DTPA-extractable Cu, Fe, Mn and Zn from air-dry soil samples were much higher compared to values from their incubated counterparts. For the three soils the CO2 production (microbial activity) reached the maximum in 5 weeks and then levelled off while the lowest values of micronutrient cation from the incubated soils were obtained between 2 to 8 weeks. Generally, the study suggests that the hot dry months preceding crop growth should increase clay surface acidity and hence availability of mironutrient cations.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02185096
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  • 3
    Digitale Medien
    Digitale Medien
    Effect of soil salinity on the electro-chemical and chemical kinetics of some plant nutrients in submerged soils (1983)
    Springer
    Plant and soil 75 (1983), S. 455-472 
    Details
    ISSN: 1573-5036
    Schlagwort(e): Ammonification ; Eh ; Flooded soils ; Iron ; Manganese ; Nitrate reduction ; Phosphorus ; pH ; Salinity and extractable cations ; Zinc
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
    Notizen: Summary The electro-chemical and chemical kinetics of six California rice soils were significantly influenced by the presence of salts up to an EC of 9 mmhos/cm in saturation extract (ECe). Subsamples of each soil salinity treatment were incubated for periods up to 10 weeks after flooding. Most of the changes in Eh and pH values took place in the first 3–4 weeks after submergence. Salinity decreased pH values, but slightly increased the redox-potential. Both ammonification and nitrate reduction were significantly decreased, by increasing soil salinity. Salinity up to 9 mmhos/cm did not affect levels of Bray and Kurtz extractable P, but increased the water extractable Ca, Mg, K and Mn. In DTPA extract, salinity in incubated soils had no effect on Zn in 4 soils, but it decreased Fe in acid and neutral soils. Possible explanations for the electro-chemical and chemical kinetic changes due to flooding and salinity are discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02369980
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  • 4
    Digitale Medien
    Digitale Medien
    Cu and Zn in soils treated with sewage sludge: Their ‘extractability’ to reagents compared with their ‘availability’ to plants (1983)
    Springer
    Plant and soil 70 (1983), S. 3-14 
    Details
    ISSN: 1573-5036
    Schlagwort(e): Availability ; Copper ; Extractability ; Sewage sludge ; Zinc
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
    Notizen: Summary Dried digested sewage sludge (cake) was mixed, in varied proportions, with three contrasting soils and cropped intermittently to ryegrass or young barley over a period of 710 days. Results are presented for periods 1–4, 13–16 and 22–23 months after the sludge and soil were mixed. At any given time the quantities of Cu or Zn that wereextractable (by EDTA or acetic acid) from a given soil showed a simple relationship to the ‘total’ quantities of Cu and Zn present. Theavailability of these elements to test crops also showed a simple relationship to their ‘total’ quantities. As a result the quantities available or extractable at any given time appeared to be related to each other also. However, though the extractabilities of Cu and Zn changed with time in some cases, and the availabilities of Cu and Zn changed with time in some cases, the changes were not matched. Increased extractability did not necessarily lead to increased uptake, and in some cases uptake increased even when extractability did not. It should not be assumed too readily therefore that because, at a given time after a soil is sludged, the quantities of added Cu and Zn that are extractable or available are sometimes correlated, the former actually measures the latter.There is no reason to assume that extractants remove all or only the forms of combination of Cu or Zn that may be taken up by crops.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02374745
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  • 5
    Digitale Medien
    Digitale Medien
    In situ immobilization of heavy metals with tetraethylenepentamine (tetren) in natural soils and its effect on toxicity and plant growth (1983)
    Springer
    Plant and soil 70 (1983), S. 49-57 
    Details
    ISSN: 1573-5036
    Schlagwort(e): Copper ; Copper complex ; Corn ; Heavy metals ; Nutrient solutions ; Tetraethylenepentamine ; Tetren ; Zea mays L ; Zinc ; Zinc complex
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
    Notizen: Summary Complex formation of copper with tetraethylenepentamine (tetren) has some pronounced effects on the rate of uptake of the metal in corn, grown on nutrient solutions. At normal copper levels (0.02 ppm) in the medium, complex formation leads to a nearly hundredfold decrease in the rate of uptake, growth rate being slightly improved. Similar effects are observed at high copper levels (0.05 and 1 ppm) in which case the growth rate, severely affected in the absence of tetren, can be restored to normal values. High excess of tetren in the medium leads to copper-deficiency. Evidence is presented that the metal is taken up and translocated to the shoot as a metal complex and that its rate of translocation through the xylem is higher than for the aqueous ion. The effects in the case of zinc are similar although somewhat less marked.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02374749
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  • 6
    Digitale Medien
    Digitale Medien
    Plant genotype differences in the uptake, translocation, accumulation, and use of mineral elements required for plant growth (1983)
    Springer
    Plant and soil 72 (1983), S. 175-196 
    Details
    ISSN: 1573-5036
    Schlagwort(e): Boron ; Calcium ; Copper ; Genotypic differences ; Iron ; Magnesium ; Manganese ; Mineral nutrition ; Molybdenum ; Nitrogen ; Phosphorus ; Plant adaptation ; Plant breeding ; Potassium ; Zinc
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
    Notizen: Abstract Plant genotypes differ in their uptake, translocation, accumulation, and use of mineral elements. Examples of genotype differences to iron, nitrogen, phosphorus, potassium, calcium, magnesium, manganese, boron, copper, zinc, and molybdenum are discussed. Current knowledge is sufficient to indicate that many crop plants can be improved for the efficient use of mineral elements and better adaptation to mineral stress conditions.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02181957
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  • 7
    Digitale Medien
    Digitale Medien
    Nutrient inflows into apple roots (1983)
    Springer
    Plant and soil 71 (1983), S. 371-380 
    Details
    ISSN: 1573-5036
    Schlagwort(e): Apple ; Calcium ; Copper ; Iron ; Irradiance ; Magnesium ; Manganese ; Nitrogen ; Nutrient uptake rate ; Phosphorus ; Potassium ; Scion effects ; Season ; Source of nitrogen ; Temperature ; Tissue nutrient level ; Zinc
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
    Notizen: Summary The rates of uptake of nutrients from solution by apple roots were measured (a) in a root laboratory, using intact roots of mature trees growing under field conditions and (b) in controlled environment using young trees. Maximum nitrate inflows into Discovery/M.9 roots under field conditions were only slightly lower than those into roots of the same genotype in controlled environment, but up to 80 times lower than those into roots of Worcester Pearmain seedlings. At any given external P concentration, P inflows into roots of field-grown trees were about 2.5-times lower than those into the roots of young trees in controlled environment. Nitrate inflows were constant above a solution concentration of 20 mmol m−3 in both field-grown and small trees. In both cases, phosphate inflows increased linearly with solution concentration up to 10 mmol m−3. Among the various plant and environmental factors influencing nutrient uptake characteristics of apple roots were: the scion genotype, tissue nutrient levels, root origin, the form in which N is supplied, level of irradiance of the shoot, root temperature and the season of the year. The effects of these factors are illustrated with examples.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02182678
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  • 8
    Digitale Medien
    Digitale Medien
    Chemical transformation and plant availability of zinc salts added to organic manure (1983)
    Springer
    Plant and soil 73 (1983), S. 337-344 
    Details
    ISSN: 1573-5036
    Schlagwort(e): Availability ; Maize ; Manure ; Slurry ; Transformation ; Zinc
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
    Notizen: Summary Assuming that their efficiency might possibly be improved by natural complex formation, inorganic Zn salts were mixed into organic manures before decomposition. These mixtures were allowed to decompose aerobically and anaerobically, to produce Zn-enriched manures and slurries, for 75 and 50 days, respectively. Fractionation of Zn in the final product revealed that the water-solubility of ZnSO4 decreased and that of ZnO increased on mixing the compounds with organic matter. Most of the added Zn remained in exchangeable form and the amount of chelated Zn increased with the time of decomposition. Plant availability of Zn from Zn-enriched manure was less and from Zn-enriched slurry was more than that of equal amounts of ZnSO4. Available soil Zn was also higher in soils treated with Zn-enriched slurry than with any other material.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02184310
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  • 9
    Digitale Medien
    Digitale Medien
    Uptake of heavy metals by crops in relation to their concentration in the soil solution (1983)
    Springer
    Plant and soil 75 (1983), S. 393-404 
    Details
    ISSN: 1573-5036
    Schlagwort(e): Cadmium ; Copper ; Heavy metals ; Lead ; Pollution ; Soil solution ; Zinc
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
    Notizen: Summary Of 20 Dutch soils, concentrations in the soil solution and total contents of Zn, Cd, Pb and Cu were determined. In addition, distribution constants were measured for Cd and Pb. Soil solution concentrations of the heavy metals as well as their total contents in the soil and exchangeable fraction, calculated with the distribution coefficients, were compared with uptake in vegetables grown in pots. Log-log plots of concentrations in the plant and the soil solution concentrations showed the best correlation for Cu, Cd and Zn. Increasing Zn appeared to increase Cd uptake at high solution concentrations of Cd and to decrease uptake at low solution concentrations. For Pb generally no significant relationship between plant uptake and soil solution concentration or any other soil parameter for Pb could be found.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02369973
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  • 10
    Digitale Medien
    Digitale Medien
    Total concentrations of Mn, Zn and Cu in certain forest soils in Greece (1983)
    Springer
    Plant and soil 74 (1983), S. 137-140 
    Details
    ISSN: 1573-5036
    Schlagwort(e): Copper ; Forest soils ; Greece ; Manganese ; Total concentrations ; Zinc
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
    Notizen: Summary Total concentrations of Mn, Zn and Cu were determined in soil samples from 144 profiles located in remote forested areas throughout the mainland of Greece. Bio-accumulation of Mn and Zn in the humic horizon took place only in moderately acid soils (pH 5–6). Mean concentrations of Mn, Zn and Cu, in the mineral section of the soil profiles, were 1383, 93, and 51 ppm, respectively. Soils from hard limestone and basic and ultrabasic igneous rock contain these three minor elements at significantly higher concentrations compared to soils from the rest of the soil parent materials. In most of the soil profiles concentration of Cu increased, and of Mn decreased, with soil depth. Concentrations of Mn, Zn and Cu in the underlaying “rocks” were within the range of their average concentrations found in the mineral soil, except for hard limestone where much lower concentrations of these elements have been found. The latter supports the theory that the parent material of soils associated with limestones might not be a solution product of the limestone rock.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02178750
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