this i cant ansewer,but this i know,,with weed there is a difrence in the soil biology,,probally why it does best at 6.5,thats to include all weeds,,get to 7 and you have good tree bioligy,,im asuming under 6.is were you get your dry state plants as in cactus,,im considering planting cover crop for 1 keep my soil alive when im not using it for winter conditions,2 i want to plant my crop right in and not disturbed for bug prevention,,the cover crop provide nitrogen mainly,but also benifit the soil and bioligy,,thats my thinking any way,,even without cover crop i water my soil to keep it alive,,probally dont but i think everything needs a drink,lmao but with that being said,the last place i lived i notice the soil had to much nitrogen,,only clover would grow were grass seed wouldnt even germ in it,,so ya there is a point of too much,,far as char goes ,i do think i can do well in it ,just from my crazy temp swings and water table,,temps are triple digits all the way in dec at times,,and rain shit,,takes what we just had a hurricane to provide us with water,,im vision the char holding on to my nutrient longer and preventing leaching so much,,raised bed on a rock bed,,so it goes out quick just threw feeding the plants so much,,bettween peat moss, char,compost,mulch,maybe i can prevent so much water use,,mt water is very alkaline so i got to do something,,taking 5 gal bucket of treated water down this hill aint getting it,lol will all this help i hope so,garunteed ,highly doubt,but got to keep moving forward cause i love the game,lol as far as a water only soil i dont think it will happen just for the fact of what is and will always be in are water table,,we cant control others,,hell they dump shit when we sleep so to speek,and everything goes down hill,,thats why i always ask about these studies,what method of the water table was used,,because regaurdless of methods we all do,when it come down to it,we,plants are water and need it for survival,,so i dont know eco,i cant answer that one at all,lmao