I'm not sure what the deal is. If a pedant wants to leave a dozen links every time he says something, and if others appreciate it, that's fine. I've done all the research so many times I can't count, and I'm not going to jump through a bunch of hoops for some guy because he thinks I should. If people choose not to believe me or ignore me because I don't link to some one's study, it's not my loss - I don't care. I'm here to help those I can, where I can - not to argue with someone with a h/o for me.
The conversation started out about the comparison between peat & coir, and I highlighted some differences that put coir in something a little less than a shining light when compared with peat. It does have a high K content. It's high pH (in comparison to peat) makes liming agents unsuitable, so if your fertilizer doesn't have Ca/Mg, you're probably going to have to use CaSO4 and MgSO4 (gypsum and Epsom salts) to get them to your plants (unless you KNOW what's in your water and have the wherewithal to adjust). DWD acts as though he's enlightening me when it comes to discussions about managing nutrition based on what's in your water, but I've had that discussion many dozens of times. The thing is, if you're a hobby grower and DON'T know what's in your water, do you think it's better to forget about adding Ca and Mg entirely and take a chance that the elements are going to be deficient, or err on the side of safety and use a mix you can safely add lime to? Also, virtually ALL commercial container mixes include lime to adjust pH AND supply Ca/Mg.
"All coir products tested have very high K contents and low Ca contents. Their pH is generally close to 6.0, so there is no possibility of using liming materials to supply Ca." From Handreck and Black's "Growing Media for Ornamental Plants and Turf". ISBN # 0 86840 796 8 I really don't make this stuff up. ;-)
When I quote a Dr of Horticulture, it's not good enough - he actually suggests the guy isn't worth listening to. We all are entitled to our opinions, but there are few greenhouse/nursery operations w/o a copy of Dr Whitcomb's work, no matter what one person's opinion. He used the same tactic on GW when I quoted another PhD, Dr Carolyn Male - dissing her as if she's also an idiot ...... but she showed up on the thread and offered her credentials, which I thought was interesting.
I don't care how anyone else might view it, I know, that when someone can pack more than 20 insults into a single post, there's assuredly an axe to grind.
Al