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Soil microbial activity as influenced by integrated and conventional production systems

100%

Pešaković M. , Milenković S. , Dukić D. , Mandić L. , Glišić I. , Luković J.

2011

tom Vol. 37, no. 3

79-85

Over the two-year study (2008–2009) we monitored the influence of integrated and conventional production systems on microbiological activity in soil and strawberry yield. The experiment also involved, fertilizers applied in three variants of treatment. The studied parameters were monitored over 2008 and 2009 by determining the total number of soil microorganisms, the number of ammonifying bacteria and the strawberry yield. The results of the study suggest the pronounced inhibitory effect of insecticides on number of studied microorganism groups in all three conventionally treated variants, over the both years of study, which further infers negligible stimulative influence of strawberry plants on yield.

Podczas dwuletnich badań (2008–2009) sprawdzono wpływ zintegrowanych i konwencjonalnych systemów produkcji na aktywność mikrobiologiczną w glebie oraz ich wpływ na plony truskawek. Eksperyment obejmował stosowanie nawozów w trzech rożnych wariantach leczenia. Podczas badań określono (w latach 2008–2009) ogólną liczbę mikroorganizmów glebowych, liczbę bakterii amonifikacyjnych i plon truskawek. Wyniki sugerują ważny efekt hamujacy insektycydów na liczebność badanych grup mikroorganizmów we wszytskich trzech wriantach stosowanych konwencjonalnych procedur w ciągu dwóch lat badań, co dowodzi nieistotnego stymulującego wpływu na uprawy truskawek.

Application Of Biological Indicators For Estimation Of Remediation Of Soil Degraded By Sulphur Industry

100%

Joniec J. , Furczak J. , Kwiatkowska E.

Ecological Chemistry and Engineering S

2015

tom 22

nr 2

269-283

The study was conducted on an experiment established in the area of the former Sulphur Mine “Jeziorko.” The remediation was applied to a soil-less formation with particle size distribution of weakly loamy sand, strongly acidified and with bad sorptive properties (Corg. - 2.0 g kg−1; pHKCl - 4.3; T - 7.0 cmol(+) kg−1). In the particular treatments of the experiment the following were applied to the soil-less formation: flotation lime and NPK; lime and sewage sludge; sewage sludge; mineral wool (5 cm 50 cm−1), lime and NPK; mineral wool (5 cm 50 cm−1), lime and sewage sludge; mineral wool (500 m3 ha−1), lime and NPK; mineral wool (500 m3 ha−1), lime and sewage sludge. Plots prepared in that manner were then sown with a mix of grasses. The control was the soil with no amendments. The analyses of the soil material comprised assays of the numbers of particular groups of bacteria and fungi, and of their biochemical and enzymatic activities. The study revealed that all the wastes applied for the remediation caused an increase in the numbers of the bacterial groups studied (copiotrophic, oligotrophic, cellulolytic, lipolytic), as well as in the respiration activity and rate of mineralisation of cellulose. That effect was the most pronounced in the case of sewage sludge. In treatments in which sewage sludge was applied, an increase was also observed in the numbers of the studied fungi (fungi on Martin medium, cellulolytic fungi, lipolytic fungi) and in lipase activity. Whereas, the application of the remaining wastes resulted in a slight decrease in the numbers of the fungal groups under analysis. Comparing the mean annual values of the analysed biological, physical, chemical and physicochemical properties it was found that the biological properties were as sensitive, and in the case of certain tests (numbers of cellulolytic and lipolytic bacteria, rate of cellulose mineralisation) even more sensitive indicators of positive changes taking place in the remediated soil.