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Predicting Crop Responses on High‐Potassium Soils of Frigid Temperature and Ustic Moisture Regimes
Author(s) -
Skogley Earl O.,
Haby Vincent A.
Publication year - 1981
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1981.03615995004500030019x
Subject(s) - extraction (chemistry) , soil water , ammonium acetate , fertilizer , saturation (graph theory) , moisture , soil test , chemistry , soil science , potassium , environmental science , cation exchange capacity , agronomy , mathematics , chromatography , high performance liquid chromatography , organic chemistry , combinatorics , biology
Results of 13 years of field research throughout Montana have demonstrated a relatively high rate of crop yield response to K fertilization when included in an N‐P‐K fertilizer program. Correlations between crop response to fertilizer K and ammonium acetate‐extractable K have been too low for this method to be used as a soil test. Alternative extraction methods or proposed soil test techniques were investigated in search of a useful relationship. These included saturated paste extraction, equilibrium extraction with dilute solutions, extraction with HEDTA or DTPA, ion‐exchange resin extraction, combination resin—ammonium acetate extraction, percentage‐K saturation of the CEC, and free energy of exchange relations for various ionic ratios. No adequate soil test relationship was identified in these studies. Soils of the northern Great Plains—Intermountain region are relatively high in extractable K and have frigid (cool) temperature regimes and ustic (semi‐arid) moisture regimes. Under these conditions, chemical measurements which relate to the quantity of K in soil apparently do not have an adequate cause‐and‐effect relationship in the availability of K to plants.