Yellow/brown splotches on leaves

S

SadbutTrue

Member
Noticed a good number of my plants have developed some yellow splotches. They aren't confined to any specific area of the plants, and some have it, some don't. Any idea what it is?

Plants: pre-98 bubba, ebb and flow system, in hydroton, 4 weeks into flower. Using sensibloom, calmag,superthrive,sensizyme,bud bloood and big blood, pH 5.8.

Pics coming. Thanks!
 

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ru4r34l

ru4r34l

Well-Known Member
Most likely by the pictures posted you have Mg lockout,

http://www.amsterdammarijuanaseedbank.com/Growguides/troubleshootingsolutions/marijuana-nutrient-disorders.html said:
Margins of the leaves are turned up, and the tips may be twisted. Leaves are yellowing (and may turn brown), but the veins remain somewhat green. » Magnesium (Mg) deficiency.

Magnesium
Mg-deficiency is pretty common since marijuana uses lots of it and many fertilizers don't have enough of it. Mg-deficiency is easily fixed with ¼ teaspoon/gallon of Epsom salts (first powdered and dissolved in some hot water) or foliar feed at ½ teaspoon/quart. When mixing up soil, use 2 teaspoon dolomite lime per gallon of soil for Mg. Mg can get locked-up by too much Ca, Cl or ammonium nitrogen. Don't overdo Mg or you'll lock up other nutrients.
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During flower I usually let my pH rise to from about 5.6 to about 6.1 - 6.2 over about a week then after about 2- 3 days at that level I bring it back down to about 5.6, seems to help not lock out any nutrients.

regards,
 
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