Paper Information

Journal:   IRANIAN JOURNAL OF AGRICULTURAL SCIENCES (JOURNAL OF AGRICULTURE)   2006 , Volume 37 , Number 3; Page(s) 471 To 479.
 
Paper: 

POTASSIUM QUANTITY-INTENSITY (Q/I) CURVE AND CORRELATION OF ITS PARAMETERS WITH CHARACTERISTICS OF SELECTED SOILS OF SUGARCANE CULTIVATION IN KHUZESTAN

 
 
Author(s):  BOSTANI A.A.A.*, SAVAGHEBI FIROUZABADI GH.R.
 
* UNIVERSITY COLLEGE OF AGRICULTURE & NATURAL RESOURCES, UNIVERSITY OF TEHRAN, KARAJ
 
Abstract: 

Potassium is a very important nutrient in sugarcane nutrition, as well as in its quantity and quality of yield. For an evaluation of soil potassium availability and fertilization management, Quantity-Intensity (Q/I) curves are useful. This study was conducted to obtain such Q/I parameters as readily exchangeable potassium (DK0), slowly exchangeable potassium (Kx), potassium activity ratio (ARK)and potassium potential buffering capacity (PBCK)as well as correlations between these parameters and physical& chemical charactristics in 0-30 cm samples of soil under sugarcane cultivation in Khuzestan Province of Iran. The results indicated that DK0 ranged from 0.0353 to 0.2257 with an average of 0.0835 meq 100g-1, Kx from 1.063 to 4.143 with an average of 2.325 me 100g-1, AR0 ranging from 0.0125 to 0.0941 with an average of 0.040 (mmol L-1) 05, and finally PBCK ranging from 1.2034 to 3.0651 with an average of 2.232 (mmoil -1)05/( meq 100g-1). The Q/I curves followed the common shapes observed in literature but varied in different soils. Correlations between PBCK and clay percentage (r=0.83**), CEC (r=0.81**), and exchangeable potassium (r=0.62*) were significant but between cultivation history, and soluble potassium, and pH were not significant. The results also indicated that long-term cultivation caused the available potassium to decrease but it had no effect on unavailable potassium.

 
Keyword(s): QUANTITY, INTENSITY CURVE, POTASSIUM BUFFERING CAPACITY
 
References: 
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