Just some general Info on my experience with red soil. My garden soil is red and clay based, looks just like the red soil in your cup. Had to use some azomite, dolomite lime, peat or coir, wetting crystals and vermiculite to break the soil. It was solid as a rock, and just turned straight into red mud at first.
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After breaking the soil with rock dust/limes and constantly tilling in compost and vermiculite over 6 months, it can grow pretty well, and has a good amount of potassium. Red soil is low in nitrogen, phosphorus and calcium and will need to be amended in you don't have your feed down pat.
This is what comes out of it now after a few years of garden composting. These didn't have any extra curricular feeding bar seasol every week or two, and the odd top dress of Coco meal and mulch every six weeks.
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I have used the clay soil from my yard to make potting mix, in equal parts with peat moss and worm castings, alongside fish and bone meal for N and P, Coco meal and potassium sulphate for K and S, kelp meal and alfalfa meal for growth stimulants and microbe activation, Neem meal for PM, and dolomite/glacial rock dust for mineral and microbe boost. The mix then gets 70/30d with perlite/vermiculite mix and does a good job.
Just depends on how long you need to or want to cook and break the soil before you grow in it.