12/12/2013 12:12 PM
Hello,
Here are Larry Stowell´s numbers. The total CEC is low even with the high sodium of 110 ppm. I prefer to work with a CEC around 6 or 7 to better balance water and nutrient retention. The second CEC quad is with a lower sodium level to get to around 4% Na of CEC.
Back to Curtis´question. The levels depend upon what type of soil composition ( CEC ) you have. Are the Albrect et al CEC levels written in stone? No, but they are very good ballpark numbers and anything extremely out of their proportions is probable to give problems.
Cation Exchange Capacity 2,8 meq
meq % ppm Target percentage
Ca 1,8 64,3 360 70
Mg 0,45 16,1 54 15
K 0,09 3,2 35 5
Na 0,478 17,1 110 5
Deficiency or Excess ( negative values are excessive )
Meq Gypsum kgs / hec
Ca 0,1596 100 kgs per hectare CaO necessary 306
Mg -0,0308 -14 kgs per hectare MgO necessary
K 0,0504 53 kgs per hectare K2O necessary
Na -0,3388 -174 kgs per hectare Na 649
Cation Exchange Capacity 2,4 meq
meq % ppm Target percentage
Ca 1,8 75 360 70
Mg 0,45 18,8 54 15
K 0,09 3,8 35 5
Na 0,1 4,2 23 5
Deficiency or Excess ( negative values are excessive )
Meq Gypsum kgs / hec
Ca -0,12 -75 kgs per hectare CaO necessary -230
Mg -0,0912 -41 kgs per hectare MgO necessary
K 0,0288 30 kgs per hectare K2O necessary
Na 0,0192 10 kgs per hectare Na -37