| http://www.w3.org/ns/prov#value | - Tools like chlorophyll meters and handheld sensors can allow you to sense nutrients in the field and help determine whether you should put down more nitrogen, potash, or other fertilizer.There are several things out there to help make that decision and come in later when the corn is waist- or shoulder-high and add more nutrients if they are necessary, Mengel says.
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