Abstract
The aim of the study was estimation of the direct and consequential effect of fertilisa- tion with compost from municipal wastes and compost from green wastes and other biodegradable wastes on the content of selected heavy metals (Cr, Pb, Cd, Ni) in maize biomass and on the content of available forms those elements in soil. The nitrogen dose applied per pot (8.60 kg of air-dry soil mate- rial) in the first year of the study in fertilised treatments was 1.00 g. In the case of treatments in which the organic materials were applied, the dose of nitrogen was introduced in whole with those materials, or as a divided dose (0.50 g N with the organic material + 0.50 g N in mineral form, NH4NO3). For comparison, fertilisation with chemically pure mineral salts and with swine manure was applied. The largest quantity of biomass, both aboveground parts and roots, was obtained in the first year of the study, in the treatment in which fertilisation with mineral salts was applied. In the second year, signifi- cantly the highest yields of maize biomass were obtained in treatments with composts or manure. The study showed also a positive response of maize to organic fertilisation applied in conjunction with mineral fertilisation. The introduction of considerable amounts of heavy metals into the soil with the compost from non-segregated municipal wastes did not cause their excessive accumulation in maize. Higher levels of available forms of the heavy metals under study were assayed in the soil immediately after the application of the composts than in the second year.
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Claims 5
Claim · model-written summary
Mineral salts produced the largest aboveground and root biomass in year one.
- Treatment
- fertilisation with mineral saltse0
- Outcome
- quantity of biomass, both aboveground parts and rootse0
- Direction
- largeste0
Zea maysNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The largest quantity of biomass, both aboveground parts and roots, was obtained in the first year of the study, in the treatment in which fertilisation with mineral salts was applied”
t0“MAIZE”
Claim · model-written summary
Compost or manure treatments had the highest maize biomass yields in year two.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In the second year, signifi- cantly the highest yields of maize biomass were obtained in treatments with composts or manure”
Claim · model-written summary
Maize responded positively to combined organic and mineral fertilization.
- Treatment
- organic fertilisation applied in conjunction with mineral fertilisatione0
- Outcome
- response of maizee0
- Direction
- positivee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a positive response of maize to organic fertilisation applied in conjunction with mineral fertilisation”
Claim · model-written summary
Municipal-waste compost did not cause excessive heavy-metal accumulation in maize.
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The introduction of considerable amounts of heavy metals into the soil with the compost from non-segregated municipal wastes did not cause their excessive accumulation in maize”
Claim · model-written summary
Soil available heavy metals were higher just after compost than in year two.
- Outcome
- levels of available forms of the heavy metals under study were assayed in the soile0
- Direction
- Highere0
- Comparator
- second yeare0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Higher levels of available forms of the heavy metals under study were assayed in the soil immediately after the application of the composts than in the second year”
t0“MAIZE”
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