KINETIC OF ZINC HUMATE IN CALCAREOUS SOIL AND ITS EFFECT ON GROWTH OF DURUM WHEAT

K. Ahmed, Righda; Al-Hadethi, Akram

	KINETIC OF ZINC HUMATE IN CALCAREOUS SOIL AND ITS EFFECT ON GROWTH OF DURUM WHEAT
The Iraqi Journal of Agricultural Science
Article 1, Volume 42, Issue 2, 2011, Pages 88-102
Authors
Righda K. Ahmed; Akram Al-Hadethi
Abstract
The aim of this experiment was to search the behavior of Zn-HA fertilizer in soil in Zn availability and its uptake by wheat comparing with (Zn-DTPA) and the metal sources (ZnSO4 .7H2O) in addition to control treatment. Incubation experiment to study physio-chemical behavior of the three fertilizers Zn-HA, Zn- DTPA, and ZnSO4.7H2O when added to soil in a normal condition by following-up. The available zinc over time and how zinc may affect by soil properties by using six kinetic equations (using Buch equilibrium technique) and their statistical parameters(r2 and SEe). In this part of study, an equal quantities of Zinc of 50 ppm from (ZnSO4 .7H2O, Zn- DTPA , and Zn-HA sources to soils and left to react for periods of 0, 14, 28, 56, 84, 98, 112, 126, 140, and 154 days with two replicates for each treatment. The results were showed that available zinc declined by 31.4% when Zn- HA fertilizer added as an average in incubation experiment, while this decline was greater over time when metal source of Zinc was added ZnSO4 .7H2O and recorded as 94.3% as an averages. The treatment of second degree-type exponential decay succeeded in describing available zinc over time. The amount of loss of added zinc from the industrial chelating source( Zn- DTPA) and natural chelating ( Zn-HA) were only 43% and 33% in the biological experiment as an average, treatment of second degree-type exponentional decay was superior in describing the available zinc over time ) 1/Ct = 1/Co + kt ). As for the Zinc uptake by wheat plant over time. Results indicated that the amount of Zn uptake increased with time by 626.7 µg.pot -1. When Zn- HA added as an average. While the value was less when Zn- DTPA and ZnSO4 .7H2O added and reached 548.2 and 444.6 µg.pot -1 respectively. The lower amount of uptake was with control treatment by 147.3 µg.pot -1. To determine the relationship between zinc uptake over time, the first order equation type exponential; Ct = ln Co-k t was the best equation successive to describe the relation.

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