Mineralization of vegetable oils used for thermal weed control in arable soils

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Graessler , P , Meyer , N , Peukert , J , Welp , G , Damerow , L , Lammers , P S & Amelung , W 2019 , ' Mineralization of vegetable oils used for thermal weed control in arable soils ' , Biology and Fertility of Soils , vol. 55 , no. 5 , pp. 471-480 . https://doi.org/10.1007/s00374-019-01359-6

Title: Mineralization of vegetable oils used for thermal weed control in arable soils
Author: Graessler, Peter; Meyer, Nele; Peukert, Juergen; Welp, Gerhard; Damerow, Lutz; Lammers, Peter Schulze; Amelung, Wulf
Contributor: University of Helsinki, Soils and climate change
Date: 2019-07
Language: eng
Number of pages: 10
Belongs to series: Biology and Fertility of Soils
ISSN: 0178-2762
URI: http://hdl.handle.net/10138/303761
Abstract: Hot vegetable oil can be used for weed control as an alternative to the use of herbicides. We analysed the temporal development of vegetable oil mineralization in soil and tested the role of nutrient supply on oil mineralization. Further, we investigated the effect of oil application on mineralization of native soil organic carbon (SOC), i.e. the priming effect. In a laboratory experiment, three oil dosages (0.1, 1.0 and 3.0ml per 35g soil) were applied to three arable soils and soil respiration was measured hourly. Both a C3-sunflower oil and a C4-corn oil were used in order to differentiate oil-derived CO2 from SOC-derived CO2. The results revealed that after 42days of incubation, 9.6 to 39.7% of the applied oil was mineralized which, however, also primed the mineralization of SOC by a factor of 2.2 to 4.2. The higher the applied oil amount, the lower was the percentage of oil-C mineralization, but the higher was the priming effect. The addition of fertilizer (0.29mgNg(-1) soil and 0.048mgPg(-1) soil) increased oil-C mineralization to 39.9 to 50.9%. We conclude that oil can temporarily accumulate in soil, especially in case of low nutrient supply. As the addition of oil stimulates SOC mineralization, a decrease of native SOC stocks may occur, which needs further quantification in long-term field experiments.
Subject: 119 Other natural sciences
Microbial nitrogen mining
Nutrient limitation
Priming effect
Soil respiration

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