Nute problem at the finish line

[Veritas629]

I've posted a similar question in my grow journal, but I'm not sure it will get many views there and might be better off in the troubleshooting section.

 

Looks like I might have my first nutrient problem on my first grow (DWC, Mills nutes, NL#5), single plant, further details here) . We are 6wks from the day the first bud started to flower. I reduced my nutes to about 970ppm this week in anticipation of flushing next week or the following. Still following the Mills feed chart as it hasn't steered me wrong yet, but on the low end of the recommend dosage. I see some brown or rust color spots that seem to start at the central vein of the leaflets. Only a few leaves affected and only leaves at the top. There is a little bit of curled tips with yellow or brown.

 

Checked and today's pH = 5.8, 1020ppm, DWC reservoir temp 19C. Completely normal for my grow! The upper light drenched leaves feel a little stiffer and drier than the lower unaffected somewhat shaded leaves. Upper leaves are probably a shade or two lighter green than the lower leaves. 

 

I'm so close to harvest and don't wanna stuff it up late in the game! Ideas?

 

 

 

 

 

 

[papasmurf999]

Too much nutes mate. Back it off a little bit. I don't run dwc but I don't think 1050 ppm is right.

[Serrated edge]

 

Feed chart hasn't steered you wrong yet ?

 

Looks like you've got some nute burn,, what were you feeding at before you lowered it ?

[pedro de pacas]

To much salt build up

[Veritas629]

Hmmm, I was thinking I might have a deficiency, but a general "too much nutes" is probably easier to fix.   I could just dilute it with a few extra liters of plain pH'd water, right?  This would keep the nutrient ratios the same, but weaker over all.  I've been using the Mills chart my whole grow and this is the first time I've seen anything like this.  Tiny bit of tip burn early on, but I mean tiny.  That's when I went from the medium chart to the low range chart.  My nutes have been steady for all of flowering: mid-900's when I res change and it builds up to 1050-1100 over the next 7-day period (I clean my res weekly).  What ppm do you think I should aim for?  

[Porky 1982]

Yeah to much goodness. Ive just had a set of autos do the same. I just gave them nothing but water for 2 weeks and they fine now. Mine in soil but.

 

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[ZEN2U]

Unless the nute is specifically designed for DWC, then you shouldn't be feeding anywhere close to max suggested feed rates for other mediums.

 

50% is suggested, with a slow increase to where the plant can best tolerate a max.

[Veritas629]

Well, I diluted too 700ppm tonight. I wanted to do full res change, but I couldn't make it in time before lights out. Learning curve....