Yes. When you plant crops you need to keep eye on them to see their growth and development more also the nature of their response to your immediate environment. In some plant you see them with yellowish patches that means they are lacking one particular mineral or the other.
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Thanks for that info! Are there some common symptoms that you always know mean a lack of a certain mineral? For example, do yellowish patches mean a lack of nitrogen in the oil? Maybe you know about a website with a list of these symptoms and what minerals you need to add to fix them?