Thanks for posting this polyantha.
I've read through it a few times now and found the following points so far...
Leaving out all the others and concentrating on the roths from locality 1 and 2 and the volonteanum form Mesilau. (so wild plants in situ)
* It's frustrating that there are no soil figures for N but going by the leaf concentrations for these 3, N is as lower than K in locality 1 much higher than K in locality 2 and much lower in the volonteanum. Conclusion for N/K ratio: (No idea), But it seems that N and K and of course P are very low.
* Fe/Mn/Zn ratios are all over the place but generally standard. (unlike Xaviers figures for mastersianum etc.)
* Exchageable Mg/Ca ratios in the soil are really high! (over 1 which is much higher than normal) Leaf Mg/Ca however are still standard. Percentages of Ca and Mg in the roth from locality 1 (for example) are pretty much the same as Xaviers emersonii.
* K in the locality 1 roth is about 1/2 of the K in the mastersianum and the emersonii. In locality 2 it's about 1/10! and in the volonteanum it's a bit higher! In other words, all over the place!!!
* Leaf content of N is also crazy form plant to plant. Really low in locality 1 and high in 2.
* Na is so much higher than K it's scary. I think Na might be taking the place of K in these plants??
In the roth from loc 1, exchangeable Na is just a bit higher than exchangeable K yet in the leaf it's off the chart compared to K!! (what's going on there?) loc 2 roth has almost no K and a huge amount of Na in the leaf! The K in the mastersianums etc is almost 10 times the Na.
* No figures for B at all??
* roth is generally an easy plant in cultivation and grows perfectly fine with standard (more or less) feeding.
* Basically we know nothing about orchid nutrition!
