Suggested OK levels for total alkalinity is 0 - 100 My well water was 188.3 MG/l. Over time that level of alkalinity REALLY bothered by trees, and even begun stunting the growth. . I switch to rain water, and in no time all alkalinity problems disappeared. I've been irrigating with rain water now for 13 years (since 10/18/04). Ideal pH for citrus is 6.5, but a Ph of 7 would absolutely be no problem. Many citrus even do OK at a Ph of 8. If you want to grow citrus in ground the sodium level should also be tested. A level of 50 MG/L or less is OK. Rootstocks that are rated as GOOD for clay soils are, Trifoliate Orange, Cleopatra mandarin, Sun Chu Sha mandarin, Shekwasha mandarin, Cleo X639, Sour orange, Smooth Flat Seville, and Kinkoji, Rootstocks rated poor for clay soils are Swingle, Carrizo, Benton citrange, C-32 & 35. All of my trees are growing on Flying Dragon, and they all do very well in my clay soil.. If you wish to do something to counter act the clay soils,I would think raised beds would be the easiest solution. As I wrote in an earlier post I used raised beds, also dug a really big hole 4' x' 4' x 4' filled with quality soil, and lastly did nothing for 4 of my in ground citrus trees. There was no difference between any of them.