Full TGIF Record # 35424
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Publication Type:
Author(s):Hassink, J.
Author Affiliation:DLO Research Institute for Agrobiology and Soil Fertility (AB-DLO), The Netherlands
Title:Prediction of the non-fertilizer N supply of mineral grassland soils
Source:Plant and Soil. Vol. 176, No. 2, September 1995, p. 71-79.
# of Pages:9
Publishing Information:Dordrecht, Netherlands: Kluwer Academic Publishers
Related Web URL:http://link.springer.com/article/10.1007/BF00017677
    Last checked: 10/14/2015
    Notes: Abstract only
Keywords:TIC Keywords: Organic matter; Fertilizers; Nitrogen fertilizers; Nitrogen uptake; Mineralization; Grassland soils
Abstract/Contents:"Different methods for estimating the non-fertilizer N supply (NFNS) of mineral grassland soils were compared. NFNS was defined as N uptake on unfertilized plots. The potential mineralization rate(0-12 weeks), macroorganic matter and active microbial biomass (determined by the substrate-induced respiration method; SIR) were correlated positively with NFNS. The difference between the actual soil organic N or microbial N content (determined by the fumigation incubation method) and their contents under equilibrium conditions (^DD org. N and ^DD MB-N), however, gave the best estimations of NFNS. For field conditions the best estimation for NFNS was: NFNS(kg N ha⁻¹yr⁻¹)=132.3 + 42.1 × ^DDorg. N (g kg⁻¹ soil; r=0.80). This method is based on the observation that, under grassland swards, close relationsships exist between soil texture and the amounts of soil organic N and microbial N. These relationships are assumed to represent equilibrium conditions as under old swards under constant management, the gain in soil organic N and microbial N equals the losses. Soils under young grassland and recently reclaimed soils contained less soil organic N and microbial N. In such soils the amounts of organic N and microbial N increase with time, which is reflected in a lower NFNS. The annual accumulation of organic and microbial N gradually becomes smaller until organic N, microbial N and NFNS reach equilibrium. The main advantage of the "difference method" in comparison with the other methods is speed and simplicity."
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Hassink, J. 1995. Prediction of the non-fertilizer N supply of mineral grassland soils. Plant Soil. 176(2):p. 71-79.
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