Paper Information

Journal:   JOURNAL OF WATER AND SOIL (AGRICULTURAL SCIENCES AND TECHNOLOGY)   MAY-JUNE 2012 , Volume 26 , Number 2; Page(s) 349 To 360.
 
Paper: 

THE STUDYING Q/I PARAMETERS OF POTASSIUM IN THE CALCAREOUS SOILS OF ARID AND SEMI ARID REGIONS IN ISFAHAN AND CHAHARMAHAL-VA-BAKHTIARI PROVINCES

 
 
Author(s):  BAHMANI M.*, SALEHI M.H., HOSSEINPOOR A.
 
* DEPARTMENT OF SOIL SCIENCE, FACULTY OF AGRICULTURE, UNIVERSITY OF SHAHREKORD
 
Abstract: 

Quantity-Intensity (Q/I) curves of potassium and their derived parameters provide general information about soil K availability and fertilizers management. This study was conducted to compare the Q/I parameters in soils of Mobarakeh and Shahrekord plains in Isfahan and Chaharmahal-va-Bakhtiari Provinces, respectively. The Q/I plots showed the common forms described in the literature but high variations were observed in the soils with respect to Q/I parameters. Results showed the following Q/I parameters for the surface soils (A horizon) of Mobarakeh and Shahrekord plains, respectively: the potassium activity ratio at equilibrium (AR0): 0.0278 to 0.1067 and 0.0174 to 0.0811 (mmol.l-1)0.5, the immediate available K (DK0): 0.728 to 2.62 and 0.56 to 4.05 mmolkg-1, the difficulty available K (KX): 1.57 to 1.71 and 3.69 to 5.25 mmol.Kg-1 and the potential buffering capacity (PBCK): 13.6 to 26.27 and 30.97 to 49.96 mmol.kg-1/ (mmol.L-1)0.5. Correlation coefficients showed a significant difference (r=0.86) between PBCK and CEC for Mobarakeh soils whereas no significant difference was observed for Shahrekord soils. A significant difference was also observed among AR0, K0 and exchangeable potassium for both of the soils studied.

 
Keyword(s): POTASSIUM, QUANTITY-INTENSITY CURVES, POTENTIAL BUFFERING CAPACITY OF POTASSIUM
 
References: 
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