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Quantity-intensity relations of potassium in representative coastal soils of eastern India.

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Title Quantity-intensity relations of potassium in representative coastal soils of eastern India.
Not Available
 
Creator Panda, R., Patra, S.K.,
 
Subject Potassium quantity-intensity isotherms Activity ratio Labile K+ Potential buffering capacity Free energy of exchange Coastal saline soils
 
Description Not Available
Quantity-intensity (Q/I) isotherms were used to evaluate the dynamics of K+ in twelve coastal soils of eastern
India. The activity ratio of K+ (ARe
K
) and corresponding changes in labile K+ ( ± ΔK) at equilibrium increased
with increasing K+ concentrations. The equilibrium activity ratio of K+ (ARe
0K) varied between 0.09 × 10−3
and 7.50 × 10−3 (mol L−1
)
1/2. The labile K+ (KL) ranged from 0.265 to 0.4 cmol kg−1 constituting 43.8 to
204.5% of 1N NH4OAc extractable K+. The readily available (K0) and fixed K+ (KX) varied from 0.082 to 0.290
and 0.041 to 0.278 cmol kg−1 contributing 22.8 to 84.5 and 15.5 to 77.2% towards KL, respectively. The potential buffering capacities for K+ (PBCK
) fluctuated from 16.2 to 85.7 cmol kg−1
(mol L−1
)
−1/2. The K+ potential ranged from 2.38 to 10.76 cmol kg−1
(mol L−1
)
−1/2. The free energy of K+ exchange (−ΔG) ranged from
−5533 to −2906 calories mol−1 indicating deficient to adequate in available K+. The ARe
0K, K0, KX and −ΔG
had significant positive correlations with pH, CEC, available and reserves soil K+, while there were inverse
relationships between PBCK and these soil parameters. A significant positive correlation was found between
ARe
0Kand K0, K+ saturation, −ΔG and significant negative correlation with KX and PBCK
. Significant positive
correlations were observed between KX and KL and PBCK and significant negative correlations with ARe
0K, −ΔG
and K+ saturation. PBCK had significant negative correlations with K0, −ΔG and K+ saturation. The study
provided useful information for understanding K+ dynamics in coastal soils and make significant contribution to
operational K+ management.
Not Available
 
Date 2019-11-27T06:21:04Z
2019-11-27T06:21:04Z
2018-07-08
 
Type Article
 
Identifier Panda, R., Patra, S.K., 2018.Quantity-intensity relations of potassium in representative coastal soils of eastern India.Geoderma 332, 198-206.
0016-7061
http://krishi.icar.gov.in/jspui/handle/123456789/25556
 
Language English
 
Relation Not Available;
 
Publisher Elsevier