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Slurry samples were filtered and the N[H.sub.4.sup.+]-N and N[O.sub.3.sup.-]-N content of the filtrate determined by continuous flow analysis on a TrAAcs 800 autoanalyser.
Samples were also analyzed with a TRAACS 800 Auto-Analyzer (Brant Luebbe, Buffalo Grove, IL) for total Kjeldahl N.
N[H.sub.4]-N was determined on a Bran and Luebbe Traacs 800 autoanalyzer (Bran and Luebbe, Elmsford, New York) following standard methods (Method 780-86T ammonia in water and wastewater).
The formula includes iron, which uses The Real Amino Acid Chelate System (TRAACS) that binds minerals to amino acids to create an organic molecule the body can use easily.
1990) using a TRAACS auto-analyser (Bran and Luebbe, Basingstoke, UK).
(1990) Operation manual for Bran and Luebbe TRAACS 800 Continuous-Flow Analytical System.
Total Kjeldahl nitrogen was determined colorimetrically (Traacs 800, Bran + Luebbe, Elmsford, New York).
Total Kjeldahl nitrogen content was determined colorimetrically on dried needles (Traacs 800, Bran + Luebbe, Elmsford, New York).
The digest was analyzed for ammonia by continuous flow colorimetric analysis (Technicon TRAACS 800).
Ammonium and [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII] concentrations in the extracted solution were measured colorimetrically using an automated segmented continuous flow analyser (Traacs 800, Bran and Luebbe).
N[H.sub.4] was extracted by shaking a separate subsample of 6 g of soil with 30 mL of 2 mol/L KCl, filtering the extract with a Seraclear filter, and analyzing the supernatant using Traacs 800 autoanalyzer methods (Bran and Luebbe 1986).