proper feeding Malawi, very important, please read if you are new to growing Malawi
I know exactly what was going on with the leaves now. My run off was waaay higher than what I was putting in (* I was putting in 850 ppm the last two days, and the runoff was 1230 ppm), so that means I had a lockout. I will not feed over 1.4 ec, as that is the cut off point for me. I did a check of ppm in and runoff these last days and have come to this conclusion. The ppm pens are all different, and some are set to 500 ppm as 1.0 ec (USA) and some are set to 700 ppm as 1.0 ec (Europe,Canada I believe). I just got a Blue Lab wand that shows both, and that set me right. Botanicare and AN and GH use the 700 ppm scale, Canna uses the 500 scale. Be careful these plants are more sensitive to nute changes than I thought. The Chem was not affected like the Malawi as it is a 9 week plant. Take any advice you want, but I will not go over 1.4 ec which on my Blue Lab pen is about 980 ppm, and I am growing in coco. For other grow mediums this may all be irrelevant. So for everyone who does not have an expensive reader for ec, here is the breakdown. Blue lab pen = 500 ppm as 1.0 ec, and that equals 700 ppm on 700 scale. 600 ppm on 500 scale equals 840 ppm on the 700 scale, or 1.2 ec, 700 ppm on the 500 scale equals 980 ppm on 700 scale or 1.4 ec, 800 ppm on the 500 scale equals 1120 ppm on the 700 scale, or 1.6 ec, 1000 ppm on the 500 scale is equal to 1400 ppm on 700 scale , or 2.0. If you are reading over that you are way, way too high. So, always make sure of what the nutrient manufacturer uses for their scale, and measure accordingly. This is absolutely the most important lesson I have learned from the leaf incident, even though to most of you out there it is probably a no brainer. My poor plants suffered for my mistake in reading ec on my ppm pen. Remember, Blue Lab is 500 scale in the USA, 700 in Canada and Europe. I was thinking 850 was 1.2 ec, when it was really 1.6, so when I upped the nutes to 1050, I was at 2.1 ec and thought I was at 1.5 ec. You have to buy the expensive wand ( cost me a lot of dough) to get both scales as the Blue Lab pen just shows ppm on the 500 ( make sure the pen says what scale it uses or contact the manufacturer), and that is where it gets you. It can be deadly if you don't get the ppm right. Lucky the Malawi are so strong, and they are recovering fast and just growing like mad. I caught this in time. Wow, my bad.
Last edited by Texicwaste666; 07-16-2017 at 05:51 AM..