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Potassium replenishment capacity of illitic soils at their minimal exchangeable K in relation to clay mineralogy
Author(s) -
Rao Ch. Srinivasa,
Khera M. S.
Publication year - 1994
Publication title -
zeitschrift für pflanzenernährung und bodenkunde
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.644
H-Index - 87
eISSN - 1522-2624
pISSN - 0044-3263
DOI - 10.1002/jpln.19941570612
Subject(s) - illite , soil water , potassium , clay minerals , mineralogy , clay soil , chemistry , soil science , geology , zoology , organic chemistry , biology
Potassium replenishment capacity of eight soil series with varying illite content of their clay fraction were studied at their minimal exchangeable K through green house experiments. Higher minimal K levels were found in soils with high initial K status. Maximum K uptake values were associated with high minimal K. The % illite also had a significant relationship with minimum K levels. Average daily rates of K replenishment of soils varied between 0.25 and 0.67 mg kg −1 soil after reaching minimum K. The K replenishment rates were found highly correlated with minimal exchangeable K (0.96 ** ). Amount of clay failed to attain the level of significance with K replenishment rate. Soils with higher illite content in their clay showed high K replenishment rates.