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David Gluhić ; Institut za poljoprivredu i turizam Poreč

Puni tekst: engleski pdf 5.438 Kb

str. 55-55

preuzimanja: 588


Puni tekst: hrvatski pdf 5.438 Kb

str. 45-55

preuzimanja: 220



Zinc is the element of special importance in corn fertilization, It is the activator of many enzymatic processes in a plant, and it is particularly important in the synthesis of growth. hormone-auxine hormone.
Zinc in soil comes from primary and secondary minerals.The average amount of zinc soil is 5-25 mg/kg,whereas in plants there is 0,6-83 mg/kg,depending on the type of the plant. Plants asquire it as cathions Zn 2+ and Zn0H+ , and as Zn-helat, whereas in a plant it is always found in a cathion form Zn2+.
Absorption of zinc from soil is an active process, but it has a very strong antagonism towards cathions Mg2+ and Ca 2+ in soil. Low temperature of soil and surplus of phosphor also make absorption of zinc more difficult. Mobillity of zinc is higher in acid soils, and in such conditions there is a possibility of washing out from the soil profile. Lack of zinc is usually found in hard clay soils, rich in calcium and with alkalic reaction(pH>7,0). Zinc in soil, in favourable circumstances, is firmly connected to absorption complex of the soil, and its concentration in the water phase of the soil is very low. Shortage of zinc is a big problem it the so called, "corn belt" in the USA.(Fluid joumal,1994.) Many researches have proved the positive influence of zinc on the increase of corn kernel crop on different soils. Therefore,additional zinc fertilization has nowadays become a necessary technological intervention in highly productive corn production.

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