Copper is a required micronutrient. You need copper. Copper sulfate used to be u...

		tropo on March 6, 2018 \| parent \| context \| favorite \| on: Dirt Poor: Have Fruits and Vegetables Become Less ... Copper is a required micronutrient. You need copper. Copper sulfate used to be used to induce vomiting. It turned out to be more toxic then we'd like in that usage... but that usage was feeding people spoonfuls of it!