Hur påverkas markorganismerna av jordbruksmetoden strukturkalkning?
Sammanfattning: This field study was done to get an understanding of how the agricultural method called “structural liming” might affect soil organisms in a negative way. Soil organisms are crucial as they perform biological processes that improve good soil structure. This is important as it enables sustainable food production, today, and in the future. Structural liming is used on clay soils to improve soil structure, enable higher yields and minimize phosphorus leakage from fields that can cause eutrophication. The knowledge about soil organisms and the effects of structural liming, is relevant for the understanding of how to improve soil health. In this study, soil samples were collected and earthworm populations were studied in two different fields that had been treated with structural lime 2014. The structural lime treatment had been done at two farms and in 12x20 m plots, where 0 tons, 4 tons, 8 tons or 16 tons had been used for each plot and replicated three times. This made it possible to compare the effects on soil organisms depending on lime treatment. Analyzes that can describe the soil conditions of the soil organisms, were done in the lab for all 24 soil samples collected from the two fields. Results of the soil respiration rate and microbial biomass showed a significant effect with the highest respiration at the treatment with 8 tons of lime. The earthworm populations did not differ due to the lime treatments. Knowledge about the effects on soil organisms caused by structural liming is lacking.
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