CLASSIFICATION OF SOILS BY PLANT-FOOD PERCENTAGES.
Maercker’s Rating (Hydrochloric-acid Extract). Grade of Soil. Poor Medium .; Normal Good .. Rich . . . Total Phosphoric Acid. Below 0-05 0-05-0-10 . . . 0-10-0-15 • • 0-15-0-25 Above 0-25 Total Nitrogen. ■ Below 0-05 0-05-0-10 0-10-0-15 0-15-0-25 Above 0-25 Rating adopted for Available Plant-food (Citric-acid Extract), as determined by B. Dyer’s Method. Grade of Soil. Potash. Phosphoric Acid. Deficient . . . Below 0-005 Below o-o 1 Normal 0-005-0-01 o-oi 0-015 Good .. . Potash. Below 0-005 ' . . 0-005-0-01 . . . Above o-o 1 Phosphoric Acid. Below o-o 1 0-01-0-015 Above 0-015
THE following tables, representing European practice, will assist readers in interpreting chemical analyses of soils as given, for instance, in the article “ Some "Soils of Otago Peninsula ” printed elsewhere in this issue.
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Bibliographic details
New Zealand Journal of Agriculture, Volume XXVII, Issue 4, 20 October 1923, Page 270
Word Count
114CLASSIFICATION OF SOILS BY PLANT-FOOD PERCENTAGES. New Zealand Journal of Agriculture, Volume XXVII, Issue 4, 20 October 1923, Page 270
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