Whether the addition of preparations with microorganism affects the organic carbon and humic substances in soil? A 3-year field study in cereal monoculture
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Date
2024
Journal Title
Journal ISSN
Volume Title
Publisher
Soil Science Society of Poland
Abstract
This paper presents an assessment of humic substances and organic carbon content in soil after application of two microorganism preparations (EmFarma Plus and UGmax) in cereal monocultures. A three-year fi eld study was carried out at the Agricultural Experimental Station in Grabow, belonging to the Institute of Soil Science and Plant Cultivation (IUNG) – State Research Institute. The first factor was tested products with microorganisms and a control without microbiological preparations. The second factor was the 2 methods of application of the above products: on stubble, on stubble + straw. The third factor was the 2 levels of N fertilisation: 0 and 180 kg N·ha–1. The preparations with microorganisms together with mineral nitrogen without were applied annually directly to stubble or stubble + straw left in the fi eld after cereal harvest and compared with a control treatment without the above preparations. The fractional composition of soil organic matter was more sensitive indicator of changes than the analyses the quantity of total organic carbon (TOC). EmFarma Plus applied on stubble and straw stubble, resulted in the organic carbon content increasing by an average of about 3.7% compared to the control plot. The second product tested had the opposite effect. The content of TOC decreased by an average of 2.5% under Ugmax applied to straw and stubble, remaining at a similar level to the control. This product, applied at a rate of 0.9 litres per hectare may have a stimulating effect on the mineralisation processes of soil organic matter (reducing the CHA: CFA ratio), hence the lower organic carbon content after application. Furthermore, it the applied on stubble and straw, without mineral nitrogen fertilisation, it reduced the CHA, and increased of CFA in the organic carbon pool and reduced of index of humifi cation. EmFarma Plus acted in reverse.
Description
Keywords
Microorganisms, Straw, Soil organic matter quality, Humic substances
Citation
Soil Sci. Ann., 2024, 75 (3) 193447