Study about the lead transfer from sewage sludge into agroecosystems.
Year: 2014
Type: article
Abstract: Zn is one of the micronutrients (MICROn) necessary in active support of plant life (Pengel & Graham 1995). Organic fertilization with sewage sludge, obtained either through processing or by composting, provides moderate concentrations of Zn in the agricultural environment. The evolution of these concentrations was studied by increasing doses of sludge between 0 and 50 t.ha -1 , with and without chemical fertilizers: NP type. Thus, the average of total Zn from soil ranged between 63 and 111 mg.kg -1 d.w. for processed sludge and between 14 and 67 mg.kg -1 d.w. for composted sludge, in comparison with the toxic limit of 200 mg.kg -1 d.w. Mobile Zn experienced was very significant growth and evident in all crop plants, namely between about 2 mg.kg -1 d.w. and 19 mg.kg -1 d.w. for maize, providing very good indices I = 0.965, between 2 and 7.5 mg.kg -1 d.w. for wheat in the second year (I = 0.884), between 2 and 15 mg.kg -1 d.w. for soybean (I = 0.932) and between 2 and 20 mg.kg -1 d.w. wheat in year four, with I = 0.948. Given these mobile Zn concentrations, plants have absorbed and used specifically MICROn, depending on the crop species. Zn in leaves of plant in bloom showed direct relationships and increasing accumulations in all cases. Zn concentrations determined ranged between 8 and 12 mg.kg -1 d.w. maize, between 29 and 41 mg.kg -1 d.w. wheat-2, between 61 to 90 mg.kg -1 d.w. in soybean and between 13 and 25 mg.kg -1 d.w. wheat-4. MICROn Zn in the final phase was deposited in the grain. Its concentrations was also increasing, but with more moderate positions. Maize deposited Zn in grains between 20 and 25 mg.kg -1 d.w., wheat-2 between 60 and 82 mg.kg -1 d.w., soybeans between 50 and 60 mg.kg -1 d.w., and wheat-4 between 34 and 39 mg.kg -1 d.w. Sludge compost filed maize kernels with Zn
Authors: F. Traşcă, N. Ionescu, G. Mincă
Language: English
Topic: Heavy metals in environment
Subfield: Pollution
Field: Environmental Science
Domain: Physical Sciences
Open Access status: diamond
OpenAlex ID: W2183375944