Will magnesium deficient foliage on a Meyer lemon re-green after proper MG levels are achieved? Thanks in advance.

No, normally the leaves will not fully recover However, foliar sprays of Epsom Salts (MgSo4), or soil root drench of MgSo4, can prevent the symptoms from appearing on leaves the following year. - Millet

Speaking of greening, it seems that the more micro products I use, like SouthernAg, the more yellow my newer leaves become. I grafted on Flying Dragon and have a hard time keeping the new leaves green. I've also tried Jack's Citrus FeED, Dyna-Gro's Foliage Pro (9-3-6), DeltAg's Microvite and their Manganese and Zinc "rocket fuels"....nothing seems to work. What in the heck am I doing wrong?

The good side is I'm getting a lot of fruit on these small greenhouse grown trees. Every citrus tree is loaded.

Thanks

Are you watering your trees with well water or municipal water? Do you know what the carbonate and bicarbonate levels (PPM) are in the water you use? - Millet

Good you got a handle on the problem. From what you wrote, I thought the problem had to be the high levels of "TDS of 830ppm, mostly bicarbs of Mg and Ca." - Now that you are using rain water, you should add one gallon of your well water to every 15 to 17 gallons of the rain water. Or add a calcium supplement, as pure rain water does not supply any calcium. .. Millet

If you alternate irrigation by using rain water, for all practical purposes in the case of the rain water it will be free from adding any soluble solids. However, your well water contains 830 PPM carbonates and bicarbonates, plus whatever sodium. Therefore, irrigating your citrus by alternating the two water sources is still adding 415 PPM carbonates and bicarbonates. The toxic level for damaging citrus by the additional carbonates and bicarbonates through a continual watering program is 200 PPM. If you have damaged foliage already, you will continual to increase problems for the foliage, plus the trees will produce fewer and fewer fruit. Even perhaps this flowering season. - Millet

I used well water almost exclusively before putting in my 305 g. rainwater collection system....no problems. Well water contains no Na or Cl. A good trick is to add sulfuric acid to my well water to bring the pH down to about 5.00. Ca is converted to a soluble gypsum, Mg converted to a soluble epsom salts. Sometimes I water using a 2 gal. watering can dipping into a large garbage can under one of the gutters..... most times using a Wayne pump and attached garden hose, pulling directly off the tank.

BTW, believe you have a Nexus like me and and are doing citrus too. Got any links to recent pics? How's the harvest?

I also put in Mallika and Pickering mangos. So called "condo" mangos because they're small trees.

Yes I have a double air inflated poly 32 X 72 ft. Nexus greenhouse, with approximately 50 citrus trees, that produce more fruit then my family can use. Therefore we give away some fruit to relatives and friends. - Millet