I just mix whatever seed I have into my compost or soil. Let it sprout and til it in or smother it.What I don't understand with the malted barley, is that this is mainly used as a source of enzymes? When you germinate barley, these enzymes are produced in high numbers. But when you kiln dry it to make malted barely it kills off a lot of enzymes, but it keeps the ones that are used for brewing. Since we are doing more than brewing and a wider range and greater number would be beneficial why are we using malted barely versus fresh germinated as used in a Sprouted Seed Tea. I have a bag of barley grains. I would think the most superior way is to sprout them then blend and either top dress/mulch or put it in a tea along with whatever else you want to add.
Starting from scratch, I have used malted barley, but purely for convenvience as an added luxery item.