THE EFFECT OF N- AND TRACE ELEMENT- FERTILISATION ON THE ZN CONTENT OF MEADOW GRASS
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Zn is an indispensable element for plants animals and humans

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 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.


Zn is an indispensable element for plants animals and humans

  • 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.


Zinc deficiency in ruminants

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


Zn status of cattle in hungary

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.


Zn status of hungarian soils

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


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

Fertőd

Oroszlány

Location of the experiments


Zn is an indispensable element for plants animals and humans

Treatments in the experiments


Zn is an indispensable element for plants animals and humans

The average Zn-content at the experimental sites


Zn is an indispensable element for plants animals and humans

Significant effects in the experiments


Extreme zn values in the experiments

Extreme Zn values in the experiments


Changing of the zn content in the vegetation period

Changing of the Zn content in the vegetation period


Zn is an indispensable element for plants animals and humans

Zn-content of the control and the treated plants


The effect of fertiliser forms on zn content

The effect of fertiliser forms on Zn-content


Significant differences between fertiliser forms

Significant differences between fertiliser forms


The effect of zn treatments on the zn content in per cent of the control

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


Frequency distribution of the zn content in hans gliget

Frequency distribution of the Zn content in Hanságliget


Changing of zn content in the oroszl ny experiment

Changing of Zn content in the Oroszlány experiment


The effect of zn dose and chemical form on zn content

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


The effect of zn dose

The effect of Zn-dose


Conclusions

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


Zn is an indispensable element for plants animals and humans

Thank you


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