NDLI: Effects of long-term mineral fertilization on microbial biomass, microbial activity, and the presence of r- and K-strategists in soil

Content Provider	Springer Nature Link
Author	Malý, Stanislav Královec, Josef Hampel, David
Copyright Year	2009
Abstract	Long-term effects of mineral fertilization on microbial biomass C (MBC), basal respiration (R B), substrate-induced respiration (R S), β-glucosidase activity, and the r–K-growth strategy of soil microflora were investigated using a field trial on grassland established in 1969. The experimental plots were fertilized at three rates of mineral N (0, 80, and 160 kg ha−1 year−1) with 32 kg P ha−1 year−1 and 100 kg K ha−1 year−1. No fertilizer was applied on the control plots (C). The application of a mineral fertilizer led to lower values of the MBC and R B, probably as a result of fast mineralization of available substrate after an input of the mineral fertilizer. The application of mineral N decreased the content of C extracted by 0.5 M K2SO4 (C ex). A positive correlation was found between pH and the proportion of active microflora (R S/MBC). The specific growth rate (μ) of soil heterotrophs was higher in the fertilized than in unfertilized soils, suggesting the stimulation of r-strategists, probably as the result of the presence of available P and rhizodepositions. The cessation of fertilization with 320 kg N ha−1 year−1 (NF) in 1989 also stimulated r-strategists compared to C soil, probably as the result of the higher content of available P in the NF soil than in the C soil.
Starting Page	753
Ending Page	760
Page Count	8
File Format	PDF
ISSN	01782762
Journal	Biology and Fertility of Soils
Volume Number	45
Issue Number	7
e-ISSN	14320789
Language	English
Publisher	Springer-Verlag
Publisher Date	2009-06-23
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Mineral fertilization Microbial biomass Respiration Growth curves r-Strategy Soil Science & Conservation Agriculture
Content Type	Text
Resource Type	Article
Subject	Agronomy and Crop Science Soil Science Microbiology

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