SLAL - To figure out what tst means I first need to know what "soymeal ending stocks" mean. Please answer that. Does it mean tradeable stocks whose price follows the price of soymeal futures? Or does it mean the current total stockpile of soymeal, in various regions and countries? Or something else?
It would be even more helpful if you provide a reference: where did you see this sentence?
If "soymeal ending stocks" means stockpiles, then tst is "thousand short tons", which is the units the stockpiles are measured in. Currently 2 countries (US and Indonesia) have stockpiles around 270-280 tst, so if this text was written some time ago, either of them may have been around the 300 tst level.
crush is defined in another thread you created a couple hours before this one. demand is clearly how much is being purchased.