The soil is heavy and I‘ve had to hand-pick rocks out of it. I plan to dig in a few handfuls per square inch of horticultural sand. I had read that manure would be too rich, so won‘t use that. But should I add some organic fertilizer like fish, bone or blood meal? I wish to plan right away.
I advise you to have the repair shop buy and install the parts. Then they give you a warranty on everything, parts and labor. If you give them the parts and there's a problem, they may say it's due to your parts having a problem and they won't warranty the complete job.
it depends on the car. on some cars you can use cheap pads and some you can,t.
Add all three ingredients you mentioned, with the addition of worm castings (red worm castings have more nutrients), compost, perlite and lime to stabilize ph. Get some guano (sea bird/bat) and brew teas with compost. Dilute the mix after it cools and use as a quick release fertilizer. Also when the soil is mixed make sure too let it break down because all of those hot nutrients can burn and dehydrate your plants. If the soil is still too heavy add some lava rocks, they're light and porous and will help prevent compacted soil.
Don't worry about inches. Take care of the bed. Compost would be the optimum choice to condition your soil. For heavy clay think 1/3 course mason sand, 1/3 compost and 1/3 vermiculite. For normal soil the sand is eliminated and peat moss used instead. A very course mason sand is important. Fine sands turn to clay in just a few months. If you want to add fish, bone or blood meal that is fine. Rabbit manure is a manure that can be used fresh in moderation. It is also available free if you call local rabbit breeders and show up with a shovel and 5 gallon buckets. 1 bucket mixed with the other ingredients would be plenty for a 64 - 100 sq foot area. You soil amenders should be at least 6 deep before you till it into the native clay. Recommend that you start a compost pile. Clay is hard to work with and needs to be amended on an annual basis for several years befor you get good soil year after year. Good luck
