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What causes nutrient burn? Is it a particular nutrient or something else?

I've been in coco for years and I watered every 3 days up until this grow, now its everyday, yesterday I noticed a little tip burn , now thinking back I did use water only twice when I had no time to get full watering done , up until then no tip burn

Now this thread has caused me to pay more attention to things, In my outside stuff I use water from 2 small ponds and a running stream , I carry test strips in my back pack and they always tested in range .well I have some real small plants and yellowing leafs ,I thought it was a n def. so I made a worm cast tea with n and P added in , with all this rain they should of been 8 to 10 feet tall but they weren't so I collected a bottle of water from each source and low and behold both were low real low 4.3 and 5.1 .I would never of thought the test strips would be off that much but this thread got me to thinking what else the leafs could be thanks Nebula you may have increased my yield by pounds lol
 
need advice ? 5 weeks into flowering and have a manganese deficiency. should i keep going or should i savage what plant is 34 inch tall and 26 inch across. buds r on the large size now. growing hps pictures don' come out so good:cool:
 
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