seems possible to reproduce the nitrogen critical level to 

 + 0.1 percent and the phosphorus level to + 0.01 percent. 

 This suggests the desirability of reporting the critical 

 percentage as a range rather than a specific value. 

 However, the common practice in agricultural applications 

 has been to report specific values. That practice has 

 been continued here. The degree of reliability indicated 

 above must be recognized and understood in using the 

 critical concentrations. The values reported here seem 

 fully as reliable as those reported for crop species. 



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