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Nutrient Dilution—Antagonism Effects in Corn and Snap Beans in Relation to Rate and Source of Applied Potassium
Author(s) -
Terman G. L.,
Allen S. E.,
Bradford B. N.
Publication year - 1975
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/sssaj1975.03615995003900040029x
Subject(s) - antagonism , phaseolus , potassium , dilution , chemistry , zea mays , nutrient , zoology , absorption (acoustics) , soil water , snap , agronomy , biology , biochemistry , ecology , physics , receptor , computer graphics (images) , organic chemistry , computer science , acoustics , thermodynamics
Greenhouse pot experiments were conducted to compare responses of corn ( Zea mays L.) and snap beans ( Phaseolus vulgaris L.) to 0 to 1,600 mg of K/pot as KNO 3 , KCl, and K 2 SO 4 on K‐deficient soils (3 kg of soil/pot). Marked responses were obtained to applied K, which were similar among sources, except for a toxic salt effect of 1,600 mg of K as KCl. Marked reciprocal K‐N, K‐P, K‐Ca, and K‐Mg relationships with yield response to rates of applied K were attributed to both dilution and ion antagonism. The latter was most pronounced at higher K rates giving little or no additional yield response and resulting in decreased Ca, Mg, or P uptake. There was a close relationship between total N and total cation concentrations in corn leaves but not in bean leaves. This difference is attributed to absorption of much of the N as NO 3 ‐N by corn and as biologically fixed NH 2 ‐N by snap beans.