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Leaf Composition and Yield Response of Corn in Relation to Quantity‐Intensity Parameters for Potassium
Author(s) -
Koch J. T.,
Orchard E. R.,
Sumner M. E.
Publication year - 1970
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/sssaj1970.03615995003400010028x
Subject(s) - potassium , oxisol , composition (language) , yield (engineering) , soil water , chemistry , agronomy , intensity (physics) , zea mays , zoology , environmental science , soil science , biology , thermodynamics , physics , linguistics , philosophy , organic chemistry , quantum mechanics
Data obtained by the quantity‐intensity (Q/I) technique were tested against field experimental results to assess the value of the Q/I approach for characterising the potassium (K) status of soils. Q/I data describe K status by relating the energy level or intensity (I) of K in the labile pool to the amount (Q) present. It was shown that in a leached ferrallitic soil (Oxisol), the pool of labile K is a good index of the amount available to corn ( Zea mays L.). It is superior as a criterion to both the equilibrium activity ratio and exchangeable K. Potassium content of the leaf is related to the pool of labile K free to participate in the mechanisms by which K is supplied to roots. Critical values for K in the labile pool at the beginning of the growing season are proposed, below which K deficiency is likely to reduce corn yield.