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Zn is an indispensable element for plants, animals and humans - PowerPoint PPT Presentation

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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: [email protected] Alps-Adria Scientific Workshop6-11 March, Opatija, Croatia

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.

Zinc deficiency in ruminants
Zinc Deficiency in Ruminants humans

  • 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

Zn status of cattle in hungary
Zn status of cattle in Hungary humans

  • 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.

Zn status of hungarian soils
Zn status of Hungarian soils humans

  • 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

Trace element status of hungarian soils according to the 1st soil test series elek pat cs k d r
Trace element status of Hungarian soils according to the 1st soil test series(Elek, Patócs, Kádár)

Location of the experiments

Hanságliget soil test series



Location of the experiments

The effect of zn treatments on the zn content in per cent of the control
The effect of Zn treatments on the Zn content soil test series(in per cent of the control)

The effect of zn dose
The effect of Zn-dose soil test series

Conclusions soil test series

  • 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

Thank you soil test series