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Zn is an indispensable element for plants, animals and humans

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Zn is an indispensable element for plants, animals and humans

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  1. THE EFFECT OF N- AND TRACE ELEMENT- FERTILISATION ON THE ZN CONTENT OF MEADOW GRASSSchmidt, R – Szakál, P.University of West Hungary Faculty of Agricultural and Food Sciences9200. Mosonmagyaróvár Vár 2. E-mail: schmidtr@mtk.nyme.hu5th Alps-Adria Scientific Workshop6-11 March, Opatija, Croatia

  2. Zn is an indispensable element for plants, animals and humans Zn in the soil can be found in the form of bivalent ion, the absorption complex of the soil binds it strongly. Its solubility increases with rising H+ ion concentration; its complex forming ability is similar to that of copper. The solubility of different zinc compounds decreases with the increasing pH Zn first of all plays important role in the function of enzymes of the intermedier metabolism Zn in plants is necessary for triptophan synthesis. Since triptophan is the precursor of indol-acetic-acid plant growth is indirectly regulated by Zn.

  3. The essentiality of Zn was proved around the 30ies of the 20th century. • From animal health point of view this knowledge became practically important when the parakeratosis disease of swine was identified as Zn-deficiency.

  4. Zinc Deficiency in Ruminants • Loss of appetite • Excessive salivation • Parakeratosis • Loss of crimp in wool fibers • Bowing of hind limbs • Stiffness of joints and swelling of hocks • Hypogonadism • Impaired immune response • Impaired wound healing

  5. Zn status of cattle in Hungary • According to the survey of Régiusné (1988) the proportion of Zn-deficient animals in cattle herds is 20-30% in saline and diluvial soils and 12% in loess soils. • This problem occurs not only in Hungary but all over the world. Bonomi et al. (1988) proved that in numerous Italian dairy farms there was a direct relationship between Zn-deficiency and the occurrence of foot diseases.

  6. Zn status of Hungarian soils • 1982. The 1st series of soil tests finished. • Result: 46% of the soils studied was deficient in Zn. ( Békés and Fejér counties 85-87%) • 1.4 mgkg-1 !!!  73% satisfactory (In some parts of the country 64% good, 23% medium, 13% poor) • Nearly one-half of the soils in the world are considered zinc-deficient

  7. Trace element status of Hungarian soils according to the 1st soil test series(Elek, Patócs, Kádár)

  8. Hanságliget Fertőd Oroszlány Location of the experiments

  9. Treatments in the experiments

  10. The average Zn-content at the experimental sites

  11. Significant effects in the experiments

  12. Extreme Zn values in the experiments

  13. Changing of the Zn content in the vegetation period

  14. Zn-content of the control and the treated plants

  15. The effect of fertiliser forms on Zn-content

  16. Significant differences between fertiliser forms

  17. The effect of Zn treatments on the Zn content(in per cent of the control)

  18. Frequency distribution of the Zn content in Hanságliget

  19. Changing of Zn content in the Oroszlány experiment

  20. The effect of Zn-dose and chemical form on Zn-content

  21. The effect of Zn-dose

  22. Conclusions • Zn deficiency in soils is common throughout the world • The average Zn-content of grasses is about 15-30 mg/kg • Zn-fertilisation generally increased the Zn-content • The 20 kg/ha Zn-dose increased the Zn-content, but it is not enough to maintain an adaequate level of Zn • The aftermath of the 20 kg/ha Zn-dose lasts for about 2 years, after this time the Zn-content decreases • Raising the Zn-content in a short time to about 40-50mg/kg requires 80-100 kg/ha Zn • Regarding the chemical forms Zn-chloride and Zn-amin were the most effective

  23. Thank you

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