Influence of long-term fertilization and crop rotation on the quantity and quality properties of soil humus substances
2009
Cieścińska, B., University of Technology and Life Sciences, Bydgoszcz (Poland) | Dębska, B., University of Technology and Life Sciences, Bydgoszcz (Poland)
In researches examined and compared composition of soil organic matter fraction and spectrofotometric properties of humic acids (HA) from soil samples in dependence on agricultural treatments. The research was performed on the basis of long-term fertilization trial carried out by SGGW since 1923 in Skierniewice Research Station. The soil samples were taken from the stands under the monoculture and crop rotation of rye and potato, considering selected fertilization combinations. It was found that humus in the stand after rye in monoculture was characterized by higher contribution of carbon of humic acids, higher value of HAs carbon to FAs carbon proportion (CHA: CFA) and by lower participation of humins. In the 5 -fields rotation system comparable results as in monoculture were found in humus under potato. The highest values of CHA: CFA were obtained in both cultivation systems with complete mineral-organic fertilization, lower values were noted in soil fertilized only by NPK. Taking into consideration two fractions of HAs - labile (FI) and strongly bound with mineral part of soil (FIII), higher values of absorbance ratios (A2/4, A2/6, A4/6) were recorded for HAs of FI fraction extracted from soil fertilized with participation of manure under rye in monoculture and rotation. Regardless to cultivated plant species absorbance ratios of HA from labile fraction were higher in soil in rotation system than in monoculture.
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