Tree Fruit Soils and Nutrition











 

 

Values for soil analyses that may be used as a guide in interpretation of soil test results

Soil analysis optimal low med high excessive Notes:
pH 6.0-7.5 <5.0   >7.5    
soluble salts <1.0     >3.0mmho/cm >4.0mmho/cm  
sodium (ESP) <15%     >15%    
potastium
(ppm)*
120-200  < 150  150-250  250-800  >800  Ammonium acetate method used**
calcium
(ppm)*
600-4000  <1000 1000-2000 >2000    
magnesium
(ppm)*
60-480  <60 60-180 >180    
phosphorus
(ppm)
10-20  <10  10-20  20-40  >40  Olsen test used E. of Cascades
boron
(ppm)
0.5-2.0  <0.5 0.5-2.0 >2.0    
sulfate-S
(ppm)
6-20  <2  2.0-10.0 >10 (sufficient)    
nitrate
(ppm)***
5-15 <5   >100    
zinc (ppm) >1.0          using DTPA extraction method 
copper (ppm) >0.6          using DTPA extraction method 
manganese (ppm) >1.5 def. only on soils pH > 7.0 toxicities may occur on acid soils using DTPA extraction method 
iron N/A          
molybdenum N/A          
Chloride N/A          

*Want the following relationship: Ca>Mg>K. Ca:Mg ratio may range from 1:1 to 20:1
**lower values expected for sodium bicarbonate method
***ppm nitrate = 10(ppm nitrate-N)
On the average, the C/N/P/S ratio in soil is 140/10/1.3/1.3

 

Mobile soil nutrients
(i.e., easily leached)
Non-mobile soil nutrients 
(strongly sorbed by soil components)
NO3-, B, SO42- and Cl  P, K, NH4+, Ca, Mg, Zn, Cu, Fe, and Mn

 

 

Updated July 9, 2004

 

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