To optimize and manipulate the process of metal phytoextraction successfully, the author studied the effects of three fertilizers (urea, horse manure, and ispolin — fertilizer on the basis of mixture of organic fertilizers, humic acids, and industrial population of worms) on yields and physiological characteristics of wheat (Triticum aestivum) and removal of metals from two Podzol soils with loam (site 1) and sandy loam (site 2) textures. Soil in site 2 was contaminated with several metals (Cd, Cu, Pb, and Zn), and soil in site 1 was relatively clean. Wheat seedlings were grown in the two soils for 36 days. Urea, manure, and ispolin were incorporated into the soils at rates of 10 mg kg-1, 100 mg kg-1, and 100 mg kg-1, respectively.
Metal concentrations in the initial soils before and after application of different fertilizers are presented in Table 28.4. No statistically significant differences were present between concentrations of Cd, Cu, Pb, and Zn in the fertilized and nonfertilized soils. Therefore, soil contamination with the metals by applied fertilizers was negligible.
The amounts of metals taken by plants during the vegetation test are shown in Figure 28.7. Although treatment of soil with all the fertilizers did not automatically result in an increase of metal concentrations in plants, it is seen that application of ispolin led to an increase of Cu and application of urea led to increased uptake of Cd, Cu, Pb, and Zn in the wheat grown in the loam (clean) soil. Amendment of sandy loam (contaminated) soil with manure and ispolin resulted in
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