Full TGIF Record # 53436
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Author(s):Velthof, G. L.; van Beusichem, M. L.; Raijmakers, W. M. F.; Janssen, B. H.
Author Affiliation:Department of Environmental Sciences, sub-department Soil Science and Plant Nutrition, Wageningen Agricultural University, P.O. Box 8005, 6700 EC Wageningen, The Netherlands
Title:Relationship between availability indices and plant uptake of nitrogen and phosphorus from organic products
Source:Plant and Soil. Vol. 200, No. 2, March 1998, p. 215-226.
# of Pages:12
Publishing Information:Dordrecht, Netherlands: Kluwer Academic Publishers
Related Web URL:http://link.springer.com/article/10.1023/A%3A1004336903214
    Last checked: 10/14/2015
    Notes: Abstract only
Keywords:TIC Keywords: Nitrogen uptake; Phosphorus uptake; Organic matter; Nutrient availability; Organic fertilizers; Indices; Lolium
Abstract/Contents:"A better knowledge of the plant-availability of nitrogen (N) and phosphorus (P) in organic products may help to improve the efficient use of these products as fertilizers. In the present study, availability indices for N and P of nine widely differing organic products obtained by different fractionation methods were compared with the plant uptake on N and P from these products. The fractionation methods included CaClâ‚‚ extraction, thermal fractionation (heating of organic products), and pepsin extraction, for N, and extraction with diluted sulphuric acid, P-Bray-I, P-Olson, and extraction using an iron oxide coated filter paper, for P. The results of pot experiments with ryegrass using a double-pot technique (Janssen, 1990) over 62 (N experiment) and 93 days (P experiment) were used as reference for plant-available N and P. The 0.01 M CaClâ‚‚ extractable inorganic N reasonably predicted plant available N only in organic products with a high inorganic N fraction. Thermal fractionation and pepsin extraction provided a reasonable index for mineralizable N in organic products having a high fraction of mineralizable N. Of the P fractionation methods, the extraction using iron oxide coated filter paper was the best indicator of plant-available P in the products."
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Velthof, G. L., M. L. van Beusichem, W. M. F. Raijmakers, B. H. Janssen, and G. L. Velthof. 1998. Relationship between availability indices and plant uptake of nitrogen and phosphorus from organic products. Plant Soil. 200(2):p. 215-226.
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