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THE QUANTITY-INTENSITY RELATIONS OF POTASSIUM IN SOILS FROM PLOTS HAVING NINE FIXED CROP ROTATIONS FOR SIX YEARS

BIJAY SINGH, K. N. SHARMA and D. S. RANA
Plant and Soil
Vol. 50, No. 2 (OCTOBER 1978), pp. 363-370
Published by: Springer
Stable URL: http://www.jstor.org/stable/42947204
Page Count: 8
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THE QUANTITY-INTENSITY RELATIONS OF POTASSIUM IN SOILS FROM PLOTS HAVING NINE FIXED CROP ROTATIONS FOR SIX YEARS
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Abstract

Soil samples collected 6 years after raising of various cereals, pulses, oil seed and tuber crops in nine fixed rotations were used to study the quantityintensity relations of potassium. Potassium activity ratio, where the soil neither gains nor looses K, was correlated in a highly significant manner (P = 0.01) with the total amount of K fertilizer applied during 6 years. The K buffering capacity, the slope of the Q/I curve, when the soil neither gains nor looses K, was positively correlated (P = 0.05) with K saturation of the total and inorganic cation exchange capacities to a similar extent. Superimposing Q/I curves showed no appreciable difference between samples from different treatments. Desorption of potassium with increasing soil: solution (0.01M CaCl₂) ratio followed a Langmuir type of equation and supported the conclusions drawn from quantity-intensity curves.

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