تلخیص
Studies were undertaken to evaluate commercial sodium chloride (NaCI) as an extract ant of exchangeable ammonium (NHJfrom soil with the objective of reducing the cost of N analyses. Ten soils differing in physicochemical properties were used in the studies. One set of soils was enriched with A7/v by adding ammonium sulphate @ 500 ug N g soil and allowing to stand for 2 hours. The soil was then leached and air dried before extraction. Locally available sodium chloride (table salt of National Foods) was compared with imported analytical grade potassium chloride (KCI) and NaCI obtained from Merck. As compared to KCI, NaCI extracted relatively higher amounts of NH4 from both untreated and NHr enriched soils. However, the differences were nonsignificant and a highly significant correlation ■ was obtained between NHrN extracted by any two extractants. Locally-obtained commercial NaCI gave higher recoveries of mineral N as compared to that from Merck, but the differences were non-significant and the two data sets were significantly correlated. Strength of the extractant did affect the extractabililty of NHrN but the differences were non-significant and a highly positive correlation was obtained for NHrN extracted by either of the extractant at either normality. Storage of extracts did not significantly affect the NHrN estimates.
M. Ashraf,, F, Hussain, F. Azam, A. Lodhi,. (1995) EVALUATION OF COMMERCIAL SODIUM CHLORIDE AS EXTRACTANT OF AMMONIUM NITROGEN FROM SOIL, The Journal Soil & Environment , Volume 10, Issue (1-4).
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