It should also be noted that regeneration needs which are associated with 

 stand conversion (code 21) are separate from those under code 23. 



Possible combinations: (13, 22, 23), (22, 23), (13, 20, 23), (20, 23), 

 (13, 20. 22, 23), (20, 22, 23), (13, 23), 



Code 30: No treatment due to productive condition 



Stands in this category are adequately stocked with productive crop 

 trees, for timber management purposes. In the case of very young stands, 

 stocking of undesirable (excess) competition is minimal, and should not impact 

 growth rates on crop trees before merchantable size is attained. In the case 

 of large sapling to small sawtimber stands, the crop trees are currently 

 growing at or near full potential for their age and the site, and are expected 

 to continue to do so for several years. 



There are no significant insect or disease problems associated with 

 stands in this category, with the possible exception of defoliators which have 

 not affected the manageability of the stand. 



Possible combinations: None 



Code 32: No treatment - Inoperable 



This category includes all stands on sites which are considered inopera- 

 ble, using current, conventional Montana logging systems (balloon and heli- 

 copter systems are not considered conventional in Montana) . 



Generally, slopes steeper than 80% are considered inoperable at the 

 present time. Other inoperable situations include very rocky areas, where 

 road building and logging might be difficult, or an otherwise operable site 

 which has no operable access routes. 



This code is not assigned using the key, but is based on field obser- 

 vations. 



Code 33: No treatment - Defer until merchantable 



Code 33 includes poletimber to small sawtimber size stands of trees whose 

 growth rates could be improved through thinning, but not without the loss of 

 near-merchantable material. Because growth rates and tree quality are ac- 

 ceptable (but not optimal), stands in this category are deferred from treat- 

 ment until the stand emerges into a size class where commercial treatment 

 options exist. However, stands in this category may qualify for overstory 

 removal (code 13) and/or sanitation (code 22), even though the crop stand 

 has been deferred from thinning. In other words, the "No treatment" label 

 applies only to the main stand component. 



Possible combinations: (13, 22, 33), (22, 33), (13, 33). 



Code 40: Unknown - Poor crowns, good growth 



This is a fairly unique but well defined category for which the data 

 compiled in the stand treatment analysis does not provide enough information 

 to make a logical decision. 



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