Please answer the following question: Given the following passage  "The major applications of copper are in electrical wires (60%), roofing and plumbing (20%) and industrial machinery (15%). Copper is mostly used as a pure metal, but when a higher hardness is required it is combined with other elements to make an alloy (5% of total use) such as brass and bronze. A small part of copper supply is used in production of compounds for nutritional supplements and fungicides in agriculture. Machining of copper is possible, although it is usually necessary to use an alloy for intricate parts to get good machinability characteristics.",  answer the following question. Note that the answer is present within the text.  Question: This thing, mostly used as a pure metal, is also used in the production of compounds for what plant-related industry?
A:
agriculture