I think Red Alder needs to grow in a tight stand to grow straight.
You are correct tramp. Tight growing alder gives you your straight sticks. The tightness also allows it to self prune quite high and given ideal self pruning you get your alder slicers. The alder plantations that are coming up are phenomenal in respect to straight, limb free stems. If allowed to go long enough you'd have allot of nice slicer wood in those plantations. Slicers are going around $1200 a thou last time I checked, almost 5 months ago. The trick to growing alder is through thinning because as soon as you get crown closure, upward growth slows down significantly; and can stagnate if not done at the right time.
One reason its so hard to find straight alder is because it likes to grow toward the light. Only trees deep inside the stand will be "straight," for an alder that is. lol
Northman... I know where there's a nice straight stand of approx 25yr old alder, one of the first experimental plantations in the country, but I don't think Weyco would appreciate your enthusiasm for killin their alder
Slowp:
Alder does better on soil that is lacking in nitrogen. Being a nitrogen fixer they love mineral soil that has low levels of nitrogen, such as after a conifer harvest. This is what makes them a great pioneer species. I do believe they have a built in response not to germinate in high nitrogen areas. Maybe someone that knows more about this than I could add substance or correct me? When used in rotation with conifer it's a great way to get some natural fert done. The only problem is planted alder cannot grow just anywhere. Bottom ground, for instance, near water has a more persistent frost layer and is hell on the roots. Benches above rivers are prime for plantation alder. Basically your best fir ground is your best alder ground. There was a conference done at the UW, if memory serves, that combined lots of Alder research into one document that can be found on tree search.
Alder is a passion of mine... strange I know lol Alder is definitely an ugly duckling story lol