The nutrient management element of a CNMP addresses the requirements for land application of manure nutrients. Land application is the preferred method of utilizing manure since these materials can supply large amounts of nutrients for crop growth, thereby reducing the need to apply commercial fertilizers. CNMP criteria are established to provide for adequate nutrients for crop growth and to mi...

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The trace element selenium has followed an unusual route on its way to becoming recognized as an essential nutrient. First feared as a plant toxin and later impugned as a suspected carcinogen, it has been shown to be required in the diets of animals and humans, in small quantities, and has been recognized as an effective anticarcinogen. Areas of selenium deficiency have been mapped, worldwide, ...

Selenium (Se) is an important element in environmental and agricultural studies and in human health, as it is an essential trace nutrient but is also toxic in excess. The role of certain chemical forms of Se is also the subject of signifi cant research into cancer prevention. ICP-MS is the analytical method of choice for both total and speciated Se measurements, but Se is diffi cult to quantify...