STUDIES ON SOME FACTORS AFFECTING THE IMPLICATIONS OF APPLYING ZINC AND COPPER TO THE SOIL-PLANT SYSTEM

Abstract

The current investigation, included, two pot experiments, to study the effect of source and rate of Zn or Cu on wheat and its content of micronutrients, wheat (Triticum aestivum c.v. Sakha 69) grown on two soils: a sand from Ismailia and a calcareous clay loam from El-Nubareya. Two other experiments were done on the interaction effect ofN and each ofZn or Cu using acid-washed sand. All four experiments were done m factorial designs of randomized complete block type. Experiment 1:

Five kg portions of soil were planted with wheat. Four Zn sources (ZnS04.7H20, ZnCh, Zn-acetate and Zri-EDTA) were applied at 0, 5, 10 and 20 mg/kg soil. Plants were harvested after 150 days.

Experiment II:

Conducted as experiment I using Cu fertilization. Four Cu sources (CuS04.SH20, CuC12.2H20, Cu-acetate and Cu-EDTA) were applied at 0, 2.5, 5 and 10 mg/kg soil . Experiment III:

This experiment (on wheat) was conducted using acid­ washed sand. Portions of 1 kg were used. N was added in two sources [(Ca(N03. 4H20 and (N hS04)] applied at 60 and 120 mg/kg soil. Zn (as ZnS04 .7H20) was applied at 0, 5, 10 and 20 mg/kg soil. Plants were removed from pots after 45 days from plating for analysis of shoots and roots.