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Impact of Paper Mill Waste on Physicochemical Properties of Soil, Crop Yield, and Chemical Composition of Plants
Author(s) -
Żołnowski Andrzej Cezary,
Sądej Wiera,
Suski Marta Sylwia,
Wyrwas Adrian,
Skrocki Dariusz
Publication year - 2019
Publication title -
clean – soil, air, water
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.444
H-Index - 66
eISSN - 1863-0669
pISSN - 1863-0650
DOI - 10.1002/clen.201900080
Subject(s) - land reclamation , yield (engineering) , chemistry , biodegradable waste , sorption , paper mill , composition (language) , crop , alkali soil , pulp and paper industry , bark (sound) , chemical composition , agronomy , environmental science , environmental chemistry , soil water , waste management , environmental engineering , organic chemistry , soil science , effluent , materials science , biology , ecology , linguistics , philosophy , adsorption , engineering , metallurgy
Paper production is among the industrial branches generating significant amounts of waste. Organic waste from paper manufacturing is mostly used in gardening and agriculture or converted for energy purposes, while inorganic waste, including green liquor dregs (GLD), is usually deposited on landfills. GLD has a highly alkaline reaction, suggestive of its possible utilization for land reclamation or for improvement of soil's physico‐chemical properties. The research results originate from a pot experiment with maize as the test plant. GLD was added to soil in doses 10–40 t ha −1 . The trials consisted of two series: with and without tree bark (TB). GLD contributed to neutralization of the soil's acidic pH, enrichment of the sorption complex with alkaline cations, and to greater salinity of the soil. In the series with TB, it is demonstrated that GLD led to a decrease in the soil content of total organic carbon; while the content of total nitrogen increased, the C:N ratio is considerably narrowed. In response to GLD, the greenness of leaves significantly improves, but this does not translate into an increase in the yield of plants. Regarding the chemical composition of plants grown in soil treated with elevated GLD doses, the content of N and Na is demonstrably higher, although no such effect is discernible in the case of P and K. For the environment, safe doses of the applied waste, not causing significant deterioration of soil properties or depressing crop yields, are 10 and 20 t GLD ha −1 .