Sort of. Sorry, not the best answer, but your pH PLUS our cold temps and heavy rains can affect micro-nutrient absorption. I am having terrible issues right now with my pummels and more tropical citrus being terribly chlorotic. All my young pummelos and pummelo-hybrids. And, most likely it is not iron. We here in S. Calif. do not tend to have iron-deficient soils, but more likely manganese deficiency. You can try a foliar application of micro-nutrients, like Gro More Citrus Growers Blend. I'm going to spray my trees this weekend and continue spraying until I can see improvement. And, forget trying to fix the pH of your soil, it just isn't feasible. Unless you've got your citrus in containers, and use a special potting mix, you just cannot make any permanent pH adjustments unless you have a very sophisticated system (like commercial blueberry growers have got going here in Calif.) Plus, your pH isn't that bad, citrus should do fine with that pH. It's just for us during winter that the pH and colder temps plus our rains create an issue with micro nutrient absorption.

Patty S.

While you are waiting for the experts to weigh in, here are a couple of interesting charts which show quite clearly how pH influences nutrient uptake.

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And again, I am no sort of citrus person, but I would be testing my soil as well as the water that goes into it.
Don't start trying to fix problems until you are certain that you have a clear understanding of exactly what they are.

They are probably also going to ask you about your soil mix as well as your feeding regimen.

Patty made some good points, blaze. Unless you are growing your citrus in containers, where you actually have some true control over the growing system, there's not a whole lot you can expect to do with your situation. We humans like to think that we can change the earth...but we are really puny little things, lol. Vinegar can make a real difference in container culture, however.

By the way, IF your citrus are planted in the ground, what is the pH of your soil (per a professional soil test)?

Another important point she made is about temperatures. Some micronutrients, iron in particular, remain really locked up and unavailable for uptake when the soil temperatures are cool.

Hello everyone! Yes we have just got out of a few days of cold temps and rain. It has been heating up for the past two days. Im seeing thing slowly get better.

My Washington Navel is in the ground and it is picking up and getting greener by the day. I had issues of grass and some greasy spot but I have taken care of that. The problem I am having is with my potted Mandarin. I did notice that when things started to cool down and the rains started on the last day of rains/cool temps the newest leaves began to show chlorotic signs with what looked like a deficiency. yellow almost white leaves with green veins. Not too bad just a couple bunches of leaves. But I was thinking since it was in the pot it was my water Ph? But as Patty has mentioned cold/wet temps along with the signs of the chart above might show a slight Manganese deficiency.

I have to test my soil for further info but the in ground Citrus I have seem to be doing OK. All the Citrus trees in my neighborhood have always flourished with green leaves and huge fruit. It is my potted Mandarin that is chlorotic. Im thinking if things have not picked up in the next few days I will foliage spray per Patty's advice. And maybe lower my tap water and feed with some micro nutrients. I have a whole week of good temps coming:-)

For a Foliage spray all that I have at the moment is MG 10-10-10 with some good micro nutes. And a specialized brand or 20-20-20 with ALOT of different micro nutes. Would either of these be a good choice for foliage spray?

Either, applied according to label would help short term; longer term I would look for the one Patty recommends and many here use; or the one that I use, Bayer Bayfolan Forte.
In reality at your pH it is probably only the iron and the Manganese that is causing your pale leaves, but the other micros cannot hurt. Even when the temperature rises, citrus still need "help" in a garden setting, as they are not good competitors and the surrounding grasses and plants often steal what they need from the soil. The foliar, which I apply every 15 days to my garden plants, is harder to steal and gets right to the issue.

Yes I agree. Considering it is in a 5 gallon pot and it is a fairly large tree, I think my 7.7 Ph water has caused lock out of nutrients. I found this on a different site:

"When pH levels climb above 6.5, iron and manganese begin to become locked up and unavailable; above 7.0 boron, copper and zinc begin their decline. It is clear then, that are certain times in a plants development and growth that different pH levels are going to affect it's growth."

For now, considering all the nutrients I just fed it should still be in the dirt in its pot, I will adjust my Ph down and water and hopefully that will unlock what nutrients are still left in the soil? Plus a foliar spray for good measure

Would 3 tsp of distilled white vinegar per gallon of water be too much to lower about 1 point?

You need to test it. I'm going through this right now with my tap water...2 different ph test kits are giving me 2 different results, what a pain. Municipality says our water is about 7.1 ( pretty low actually) and adding 1/2 tsp per gallon is too much...

The tester is first on my list. I used to have a nice test pen that worked like a charm. After I stopped growing hydroponically I sold it a while ago thinking I would never need it again:-(

The problem with my Mandarin is not too bad right now but I am definitely going to get another Ph test pen. Thanks everyone

I'd do the same if I had a clue what brand to use... I'm all ears if you or anyone has a recommendation? Bummer that you sold yours...ooops, I said "bummer"...now everyone knows how old I am :-)

"Bummer" came along relatively late in my life... and now everyone knows how old I am!! I think with all you are doing, the only thing you are lacking is patience; none of these "fixes" work as fast as Raid bug spray.

I havent done anything yet. Im waiting until I get a test meter. Plus things are slowly getting better. The only thing I said I was going to do was water with some vinegar and possibly a foliar spray...lol

And the pen I used to have was an Oakton. It never failed me:-)