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  • 1
    Electronic Resource
    Electronic Resource
    Micronutrient availability to cereals from calcareous soils (1979)
    Springer
    Plant and soil 52 (1979), S. 537-545 
    Details
    ISSN: 1573-5036
    Keywords: Copper ; Disc-plough ; Laminated layer ; Manganese ; Nitrogen ; Nutrient absorption ; Plough-pan ; Rotavator ; Subsoiler ; Weed ; Zinc
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary The mechanism of higher grain production of wheat (Triticum aestivum L.) by four tillage methods was explored on a sandy calcareous soil of Sahl-Al Jafara, Libya, during the year 1976–77. Tillage methods increased grain yield and dry matter weight at the boot stage in the order of no-tillage〈rotovator=disc plough 〈 subsoiler. Rotovation to 15 cm and disc ploughing to 25 cm depth enhanced grain production mainly by eliminating weed competition. In both the cases, roots penetrated 〈 25 cm where plough-pan existed. Further yield increases by 50 cm deep subsoiling seems to be mainly explained by N and Cu rise in plants from their marginal to optimum levels and by reduction of Mn deficiency in plant shoots. Penetration of roots beyond the 25 cm plough-pan apparently resulted in higher absorption of these nutrients from leached or native soil supplies. Subsoiling also resulted in greater Zn concentration in plant shoots which, under marginal to deficient conditions, will also increase grain production.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02277949
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  • 2
    Electronic Resource
    Electronic Resource
    Zinc-copper antagonism in the nutrition of rice (Oryza sativa L.) (1973)
    Springer
    Plant and soil 38 (1973), S. 573-580 
    Details
    ISSN: 1573-5036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary The effect of various doses of copper and zinc on their uptake and on the yield of rice were studied. Copper applications increased copper contents in the plants without effecting the zinc contents. However, zinc applications though increased zinc contents but markedly decreased the copper contents in the plants. This antagonistic effect of zinc on copper suggests that zinc applications can reduce rice yield if available copper is marginal in the soils. re]19720628
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00010697
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  • 3
    Electronic Resource
    Electronic Resource
    Micronutrient availability to cereals from calcareous soils (1976)
    Springer
    Plant and soil 45 (1976), S. 411-420 
    Details
    ISSN: 1573-5036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary The effect of flooding on chemical composition of solutions of two alkaline calcareous soils were studied for incubation periods of 0, 2, 3, 4, 5 and 8 weeks. Flooding slightly reduced pH of both the soils. The concentration of Ca, Mg, HCO3, Mn, Fe, P, and total soluble salts markedly increased. This occurred rapidly in the beginning but at a much slower rate later on during incubation. Drying the soils from 7th to 8th week of submergence greatly depressed their concentration. Flooding had no effect on Cu but increased Zn concentration. The contents of various ions in submerged soils generally had little relationship to those in dry soils. Manganese and Fe strongly depressed 65 Zn absorption by rice (Oryza sativa L.) from solution cultures. Flooding induced increased contents of various ions in soil solutions appear to be a major cause of accentuating Zn and Cu deficiency in rice and of obscuring the predictability of soil tests for Zn and Cu availability to lowland rice. re]19750515
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00011703
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  • 4
    Electronic Resource
    Electronic Resource
    Micronutrient availability to cereals from calcareous soils (1977)
    Springer
    Plant and soil 47 (1977), S. 297-302 
    Details
    ISSN: 1573-5036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary By contrast of strong phosphorus-zinc antagonism in upland crops, P strongly enhanced Zn uptake in flooded rice on a calcareous soil. Radioisotopic studies indicated increase to occur preferentially from applied Zn fertilizer. Phosphorus appeared to stimulate uptake predominantly by enhancing Zn concentration in soil solution and by increasing metabolic Zn absorption by plant roots. The ‘A’ value was not a reliable measure of labile soil Zn for rice as it markedly changed with levels of P and Zn fertilizers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00010395
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  • 5
    Electronic Resource
    Electronic Resource
    Micronutrient availability to cereals from calcareous soils (1976)
    Springer
    Plant and soil 45 (1976), S. 613-623 
    Details
    ISSN: 1573-5036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Short-term Zn absorption by rice (Oryza sativa L.) increased gradually with increasing concentration of solution Zn from 0.08 to 10 μM. Two fine-grained rice varieties absorbed Zn by two mechanisms; one operated at lower, relevant to deficient and marginal and the other at higher, relevant to optimum and toxic soil Zn concentrations. Coarse-grained rice variety absorbed Zn only by one mechanism. Hydrogen strongly depressed Zn absorption by rice within pH range of 7.2 to 5.5. From pH 5.5 to 4.5, it was severely toxic to Zn absorption mechanism. Toxic effect is not important for submerged rice where soil pH is usually 7.0. Increasing Ca concentration from 500 μM to 5 mM depressed Zn absorption by rice from Zn concentrations of both the mechanism. The effect was higher for the first mechanism of low solution Zn contents. Magnesium and Cu inhibited Zn absorption by rice non-competitively from the first and competitively from the second mechanism. Calcium, Mg, Fe, Mn, and P depressed Zn absorption by rice also from soil percolates. Increased contents of inhibiting ions with soil submergence is responsible for higher incidence of Zn deficiency in lowland rice than in wheat and other upland crops. They seem to be also responsible for obscuring the predictability of soil Zn tests for lowland rice. The present studies fail to explain higher incidence of Cu-Zn antagonism in wheat than in rice. re]19750515
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00010583
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  • 6
    Electronic Resource
    Electronic Resource
    Mechanism of nitrogen effect on zinc nutrition of flooded rice (1977)
    Springer
    Plant and soil 46 (1977), S. 649-654 
    Details
    ISSN: 1573-5036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Nitrogen application increased Zn contents of flooded rice on two calcareous soils. Urea and (NH4)2SO4 being better N carriers than NH4NO3 resulted in higher increase. Nitrogen enhanced Zn contents partly through growth promotion but mainly by increasing soil Zn solubility and root efficiency for Zn absorption. Zinc solubility rose by an enigmatic mechanism and not from pH reduction or soluble Zn-HN3 complex formation as occurs for upland plants. Nitrogen aggravated Zn retention in upland plant roots as immobile Zn-protein complex was not important for rice. Bicarbonate inhibition of Zn uptake by rice from CO(NH2)2 application or its stimulation by lower redox potential from NH4NO3 addition were not involved.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00015925
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  • 7
    Electronic Resource
    Electronic Resource
    Micronutrient availability to cereals from calcareous soils (1976)
    Springer
    Plant and soil 45 (1976), S. 397-410 
    Details
    ISSN: 1573-5036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary On several alkaline calcareous soils, Zn and Cu deficiency occurred mainly in lowland rice (Oryza sativa L.) and was rarely found in wheat (Triticum aestivum L.). Zinc and Cu requirement of plants was not responsible as the critical Zn and Cu contents in tops of the two plant species were almost similar i.e. 17.4, 6.5 and 14.5, 5.6 ppm respectively. Neither did rice absorb Zn and Cu less efficiently. On the contrary, their rates of absorption in rice were double than in wheat. They were 22.2, 6.3 and 10.2, 3.3 ng atoms/g fresh root/h respectively in the two plant species. Flooded soil conditions appeared to be responsible for Zn and Cu deficiency in rice as their deficiency was found mainly in plant samples collected from continuously flooded fields. The mechanism is not known. Both Zn and Cu inhibited uptake of each other in wheat on most of the soils. In rice, only applied Zn depressed Cu uptake but Cu had generally little effect on Zn uptake. Little Cu inhibition of Zn uptake in lowland rice seems to be related to flooded soil conditions. The mechanism is yet to be known. The antagonising element accentuated the deficiency of the other element both in wheat and rice and severely reduced their yields on soils marginal to deficient in Zn or Cu supplies. It is recommended that their soil availability status should be thoroughly considered before their fertilizers are applied. re]19750515
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00011702
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  • 8
    Electronic Resource
    Electronic Resource
    Zinc uptake by rice as affected by iron and a chelator of ferrous iron (1976)
    Springer
    Plant and soil 45 (1976), S. 697-700 
    Details
    ISSN: 1573-5036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Iron competitively inhibited Zn absorption by rice (Oryza sativa L. cv. Earlirose) grown in solution culture. The effect was more marked for shoots since Fe had also a competitive effect on Zn translocation from roots to shoots. The chelating agent baptholphenanthrolinesulfonate (BPDS), which has great ability to chelate Fe++, alleviated the inhibitory effect of Fe to a large extent. re]19750516
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00010591
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  • 9
    Electronic Resource
    Electronic Resource
    Mechanism of differential susceptibility of two rice varieties to zinc deficiency (1977)
    Springer
    Plant and soil 46 (1977), S. 637-642 
    Details
    ISSN: 1573-5036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary The mechanism of differential susceptibility of two rice (Oryza sativa L.) varieties to Zn deficiency was explored in 20 field trials. IR-6 rice suffered with Zn deficiency much more severely than Basmati-370. Higher Fe absorption seems to be mainly responsible. It achieved this effect by strongly inhibiting Zn absorption and by markedly increasing internal Zn requirement as IR-6 plants.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00015923
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  • 10
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    Zinc Absorption by Wheat Seedlings: II. Inhibition by Hydrogen Ions and by Micronutrient Cations (1972)
    Wiley
    Details
    Publication Date: 1972-03-01
    Print ISSN: 0361-5995
    Electronic ISSN: 1435-0661
    Topics: Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Published by Wiley
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