Experimental organic grow Autoflo

Well well well, This week didn't go as well as I thoughts. I've noticed a lack of smth I can't tell on the very first big leaves of each banana. They didn't stretch as much as for other growers, maybe because it's under organic growth. Therefore the different buds are forming good and nicely ! I hope they will be thicker and even bigger by end of next week. I still used nettle manure and also added some potassium to help the damaged to leaves yo recover. Fail tho Also noticed that some of the top end of the leaves begins to turn deep brow like burned. I really hope it won't affect more the girls and will get better by end of next week Btw, every advice is welcome