Table 8.— Amounts of foliar nutrients for 601 released western redcedar trees 



rauirieni 



Mean 



Standard 

 deviation 



Maximum 



Minimum 



Zinc (ppm) 



16.02 



3.01 



23.80 



11.00 



Manganese (ppm) 



130.54 



34.90 



225.00 



75.00 



Copper (ppm) 



5.04 



1.16 



7.50 



2.50 



Iron (ppm) 



159.14 



75.75 



488.00 



88.00 



Sodium (ppm) 



234.36 



89.79 



403.00 



115.00 



Potassium (ppm) 



5,938.25 



1,210.12 



8,800.00 



4,100.00 



Calcium (ppm) 



12,678.57 



3,441.61 



23,000.00 



8,500.00 



Magnesium (ppm) 



1,003.57 



173.83 



1,225.00 



600.00 



Sulfur (ppm) 



380.68 



41.77 



468.00 



309.00 



Boron (ppm) 



13.97 



3.54 



22.65 



9.15 



Nitrogen (%) 



.90 



.12 



1.15 



.63 



Phosphorus (%) 



.13 



.01 



.15 



.09 



Table 9. — Foliar nutrients associated with the difference between released and predicted nonreleased d.b.h. growth 



Nutrient 



Coefficient 



Significance 



Zinc (ppm) 





NS' 



Manganese (ppm) 



0.0034 



0.0008 



Copper (ppm) 





NS 



Iron (ppm) 



- .0033 



.0001 



Sodium (ppm) 



- .0042 



.0001 



Potassium (ppm)/100 



- .0240 



.0001 



Calcium (ppm) 





NS 



Magnesium (ppm) 





NS 



Sulfur (ppm) 



- .0121 



.0001 



Boron (ppm) 





NS 



Nitrogen (%) 





NS 



Phosphorus (%) 



55.9794 



.0001 



Predicted growth 



.1999 



.0001 



Intercept 



-2.0210 



.0001 



Ft 2 



.371 





'NS = nonsignificant (P < 0.05) 

 No coefficients given for nonsignificant variables. 



these foliar nutrients was less than the diameter incre- The colors of western redcedar foliage were asso- 



ment of released trees with the lower concentrations. ciated with the growth difference between released and 



Using two variable regression models, selected inter- predicted nonreleased tree diameter growths. Six 



actions between foliar nutrients were tested. Total percent of the variation in the difference between 



nitrogen and phosphorus appeared to have no signifi- released and predicted nonreleased diameter growth of 



cant interactions with other foliar nutrients when their western redcedar was accounted for in the analysis by 



foliar color. Western redcedar trees with green-yellow 

 foliage had a diameter growth-response-mean of 

 -0.156, whereas trees with greenish green-yellow 

 foliage had the response mean of -0.874 (table 10). 

 Significant differences were detected in the time- 

 adjusted growth response means for the different foliar 

 colors. Three groups of foliar-color-classified growth 

 response means were separated. Trees having green- 

 yellow foliage dominated the group with the larger 

 growth response means (a): trees with green-yellow 

 foliage and yellowish-green foliage dominated the 

 middle group of growth response means (b): and trees 

 with green-yellow, greenish green-yellow and yellowish- 

 green-yellow foliage occupied the group with the 

 smaller growth response means (c) (table 10). 



Western redcedar foliage classified by color had 

 different mean concentrations of foliar nutrients. 

 Deficient concentrations of foliar nutrients are as 



association with the release response of western red- 

 cedar was tested, as shown in the following tabulation: 



Variable 



Significant 



interaction 



coefficient 



Mg* P 



NS 



Mn* P 



NS 



N* P 



NS 



N* Fe 



NS 



N* Na 



NS 



N* S 



NS 



N* Mg 



NS 



N* Mn 



NS 



N* K 



NS 



NS = non-significant (P^ 



0.05) 



Model Form: In (DDS "released") - In (DDS "non- 

 released") = Predicted growth + variable (1) + 

 variable (2) + variable (1)* variable (2) 



13 



