is this a calcium deficiency???

[Trichopathic1]

Do any of the experienced growers know what can cause this?fox farm soil,36 days flowering,p.h. 6.3-6.4 It appeared within 2 days only on a few top leaves.and only on the biggest of 2 plants.From what we gather the low p.h. can lock out nutrients like calcium or magnesium? they get watered every few days.only water the last 2 times fed. we read that hydrated lime added 2 the water will balance the p.h. in soil.and may turn them around.we are leery of messing them up further so,any help from some one with good knowledge of this would be great.thanks!

 

[Woomeister]

Magnesium (Mg)
Magnesium is a component of the chlorophyll molecule and serves as a cofactor in most enzymes.
Magnesium (Mg) deficiency:
Magnesium deficiency will exhibit a yellowing (which may turn brown) and interveinal chlorosis beginning in the older leaves. The older leaves will be the first to develop interveinal chlorosis. Starting at leaf margin or tip and progressing inward between the veins. Notice how the veins remain somewhat green though as can be seen in figure 15.
Notice how in figure 16 and 17 the leaves curl upwards like they're praying? They're praying for Mg! The tips may also twist.
This can be quickly resolved by watering with 1 tablespoon Epsom salts/gallon of water. Until you can correct nutrient lockout, try foliar feeding. That way the plants get all the nitrogen and Mg they need. The plants can be foliar feed at ½ teaspoon/quart of Epsom salts (first powdered and dissolved in some hot water). When mixing up soil, use 2 teaspoon dolomite lime per gallon of soil.
If the starting water is above 200 ppm, that is pretty hard water, that will lock out mg with all of the calcium in the water. Either add a 1/4 teaspoon per gallon of epsom salts or lime (both will effectively reduce the lockout or invest into a reverse osmosis water filter.
Mg can get locked-up by too much Ca, Cl or ammonium nitrogen. Don't overdo Mg or you'll lock up other nutrients. This is what it appears to be imo.

 

[KP2]

it's calcium, magnesium, phosphorous, and potassium deficiencies. feed higher strength nutes.

 

[Trichopathic1]

Magnesium (Mg)
Magnesium is a component of the chlorophyll molecule and serves as a cofactor in most enzymes.
Magnesium (Mg) deficiency:
Magnesium deficiency will exhibit a yellowing (which may turn brown) and interveinal chlorosis beginning in the older leaves. The older leaves will be the first to develop interveinal chlorosis. Starting at leaf margin or tip and progressing inward between the veins. Notice how the veins remain somewhat green though as can be seen in figure 15.
Notice how in figure 16 and 17 the leaves curl upwards like they're praying? They're praying for Mg! The tips may also twist.
This can be quickly resolved by watering with 1 tablespoon Epsom salts/gallon of water. Until you can correct nutrient lockout, try foliar feeding. That way the plants get all the nitrogen and Mg they need. The plants can be foliar feed at ½ teaspoon/quart of Epsom salts (first powdered and dissolved in some hot water). When mixing up soil, use 2 teaspoon dolomite lime per gallon of soil.
If the starting water is above 200 ppm, that is pretty hard water, that will lock out mg with all of the calcium in the water. Either add a 1/4 teaspoon per gallon of epsom salts or lime (both will effectively reduce the lockout or invest into a reverse osmosis water filter.
Mg can get locked-up by too much Ca, Cl or ammonium nitrogen. Don't overdo Mg or you'll lock up other nutrients. This is what it appears to be imo.

Thanks woomeister, I appreciate your input on this!So were kinda on the right track with the lockout then? our tap water had stayed pretty consistant keeping the soil @ 6.8.we hadnt checked in a couple weeks until this problem occured.every other water we used big bloom 1/4 cup & 2 tsp.tiger bloom per gallon of water and fed both girlz 2 gallons each.Does this sound like the right amount of watering and nutes to you? thanks again!

 

[Trichopathic1]

Thanks also kp2, we were figuring if we had lock out going on,giving them more nutes wouldnt do any good and could screw em up worse.So until we found out more info,we had given them water only.Im new to growing,but I know the more knowledge from exp. people the better.Thanks again!

 

[Trichopathic1]

We are getting lime 2day from home depot and giving her a dose of that and see what happens. We are cautious of using epsom salt unless we have to.thanks again for the advice guys.I'll post in a day or so with results.

 

[brasmith]

Thanks woomeister, I appreciate your input on this!So were kinda on the right track with the lockout then? our tap water had stayed pretty consistant keeping the soil @ 6.8.we hadnt checked in a couple weeks until this problem occured.every other water we used big bloom 1/4 cup & 2 tsp.tiger bloom per gallon of water and fed both girlz 2 gallons each.Does this sound like the right amount of watering and nutes to you? thanks again!

Sounds like they are getting an over dose of food. Looks like they are getting too rich of a feeding which is probably why they are dealing with lockout issues. Try bringing your doses down to 3 teaspoons of food per gallon of water. However I suggest doing a big flush before you feed them again. This will rinse out the built up food and salts that is still in the soil and then after a few days and on your next feeding add the dolomite and a 1/2 dose of food.

The amount of water you are giving them is completely porpotional to the size and amount of soil your pot holds. So if you are using 1 gallon pots with 1 gallon of soil, then the plant does not require 2 gallons of water. You just want a bit of runoff after a watering/feeding. Good luck

 

[Trichopathic1]

Thank you very much for your advice brasmith.We ended up giving them gardening lime and water a few days ago.They are doing good now other than some yellowing leaves that obviously wont change back.Yesterday we started looking closer at the trichomes on them(with our radio shack micro) And we have at least 50% cloudy with some amber.Today we are going to start our flush.We are only at 6 weeks but have learned that some indicas may finish early.We have only given them water since the whole spotty leaf deal started.we were thinkin of flushing good for a week and harvest one plant at the end of this week,keep flushing the other for another week and then harvest that one.what do you think about this.We know you usually want to do a full 2 weeks of flushing but theyve only been given water so we thought we'd be ok.Heres some pics from yesterday.thanks again man!

 

[smokinHerbOnDaCurb]

some pretty buds good job they might be a little over fed.

 

[Trichopathic1]

Thanx smokin! Yeah our ph got low on us and we think it locked the nutes out.we added gardeners lime with water and their doing alot better now.check out my thread I just posted in harvesting and curing.But yeah we had only been feeding them every other watering.And we usually water every few days aproximately.But the leaf tips were showing burn so we didnt give them nutes for a couple weeks.Live and learn.Thanks again for the input Man!!

 

[brasmith]

Hi Trich your buds are pretty. As you said earlier there are some strains that finish in 8 weeks. So the flusing time you are using now will make for a clean smoke later. Typically indicas require a total of 8 weeks of 12/12 (once preflowers show) and that includes the 2 weeks of flush time. So you are doing good by your girls, they look like harvest day is just around the corner. Nice job