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Paper Information

Journal:   IRANIAN JOURNAL OF SOIL AND WATERS SCIENCES   2004 , Volume 18 , Number 2; Page(s) 0 To 0.
 
Paper: 

STUDY ON K-BEHAVIOR IN THREE DIFFERENT SOILS WITH VARIOUS CEC UNDER CORN (ZEA MAYS L.) CULTIVATION

 
 
Author(s):  BAZARGAN K., MALAKOUTI M.J., EFTEKHARI K.
 
* 
 
Abstract: 

Three topsoils were selected from the different farm areas of Karaj region having CEC of 6.2, 13.6 and 18.8 cmol+/kg-1and with different textures (sand, clay loam and silty clay loam). Available potassium levels in the soils were 164, 256 and 328 mg/kg, respectively. The soils were used for a green house trial. Twenty pots were filled with 16 kg of each soil for eight potassium treatments plus one additional treatment (same three soils without K-fertilizer and without plants). The additional treatment received irrigation water similar to other pots. The experiment had a complete randomized design as factorial, plus one additional treatment, containing two factors of soils with various CEC and potassium fertilizer rates, with three replications. Two corn seeds were planted in each pot. Plants were irrigated with distilled water during ten weeks growth. Subsequently, the corn plants were cut and analyzed for potassium and magnesium. Available potassium levels were measured in samples collected from each pot after harvesting. The statistical analysis of the data showed that there was a significant difference at 5% level on the potassium concentrations in the shoots but the dry weight yields of shoots and the total potassium content of shoots were not significantly affected by the treatments. Similarly, potassium treatments did not affect magnesium uptake by the corn plants significantly. A comparison between the soil available potassium levels before planting and after harvesting showed a decline of soil available potassium for the three soils, irrespective of the fertilizer treatments. Subtracting the sum of soil available potassium after harvest plus the amount of potassium measured in the shoots of corn from the sum of the initial soil available potassium plus the added fertilizer potassium, a term ΔK was defined and used to balance the changes in the available soil potassium levels. The outputs showed the results of fitting a second order polynomial model to describe the relationship between the ΔK of different soils with various CEC and the amount of added potassium to pots. Results showed a positive statistical significant relationship between the two factors at the 1% level. The behavior of soils having low and intermediate CEC is similar but different from the soil with high CEC. A negative ΔK indicated that non-exchangeable potassium had been released during the experiment, irrespective of the fertilizer treatments. However, increasing the rates of potassium application resulted in a declining trend in ΔK values towards zero. The lighter the soil texture with lower CEC, the less potassium fertilizer was required to drive ΔK to zero.

 
Keyword(s): CORN; SOIL TEXTURE; CEC; K-FERTILIZERS; K- BEHAVIOR
 
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