| |
| Publication Type:
| Refereed |
|---|
| 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. |
|---|
| Publishing Information: | Dordrecht, Netherlands: Kluwer Academic Publishers |
|---|
| # of Pages: | 9 |
|---|
| 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." |
|---|
| Language: | English |
|---|
| References: | 30 |
|---|
| Note: | Figures
Tables |
|---|
| 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. |
| Fastlink to access this record outside TGIF: https://tic.msu.edu/tgif/flink?recno=35424 |
| If there are problems with this record, send us feedback about record 35424. |
| Choices for finding the above item: |
|---|
| 
MSU catalog number: SB 13 .P55 |
| Find from within TIC:
Digitally in TIC by record number. |
| Request through your local library's inter-library loan service (bring or send a copy of this TGIF record) |
