Yep, 104 today in my neck of the woods, thats a great idea, I have yet to use gypsum, does it add a fluff to the dirt? I figured after a watering it'd revert to stiff clay. Havent done much research though, definitely going to get some though!
will break it down,you be thinking you bought bag soil,,my place in east texas,black gumbo,,2500 sq ft garden,,went and plowed and till smooth,let it sit for a week ,went to feed store bought a ton of lime,a ton is a tractor bucket full,spread it all out about 2in thick over garden,plolwed and tilled smooth again,wait a week,had 15 yrds of red top soil brought in,spread it,plow and till,week later ,went to local mushroom plant got a bucket full of mushroom compost,spread ,plow and till,,then i put landscape cloth over entire garden,stapled in soaker hose down each row,and done,,only feed them plants got for 5 years was water,thats it,,so my tomato bed same shit,,clay is soft in cooler weather but still gummie,heat on you cant stick a post hole digger in it,,so bought that 5 gallon bucket of sheetrock mud,dumped it in the bed twice and did same with sand compost and lime over 3 month period,,never had blight which they great for ,never cal mag problem ,nothing,but water,when the triple digit hit,i put a top coat of chicken shit on the top and all good,,same for rose beds,,thing is ,it takes a little time to break that shit up,but when you do,as long as you dont neglect it,you will have excellant soil