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One N Size Does

机译：一N大小

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Average the shirt size of three neighbors and you'll probably come up with "medium." However, that doesn't mean you should all wear that size. If you do, somebody's bound to have his belly sticking out while someone else may have shirttails to his knees. The bottom line is we all know that one size doesn't fit all, but we still apply nitrogen (N) that way. Richard Mulvaney, a soil scientist at the University of Illinois, didn't start out trying to debunk the well-established proven-yield method, butthat's exactly what he and his colleagues did. "Soils differ. Farmers know that, but the proven-yield method has always been the same: Take your yield x 1.2 and that's how much nitrogen you need," says Mulvaney. "Proven-yield says higher yields need more fertilizer N. That's 180° wrong. What matters is how much N comes from the soil. Rich soils need less N from fertilizer, while poor soils need more."
机译：平均三个邻居的衬衫大小，您可能会得出“中”字样。但是，这并不意味着您都应该穿这个尺寸。如果这样做，某人的腹部肯定会伸出来，而其他人的膝盖可能会扎成辫子。最重要的是，我们都知道一个尺寸并不适合所有尺寸，但是我们仍然以这种方式施加氮（N）。伊利诺伊大学的土壤科学家理查德·穆尔瓦尼（Richard Mulvaney）并没有尝试揭穿公认的成熟产量方法，但这正是他和他的同事所做的。 “土壤有所不同。农民知道这一点，但是成熟的产量方法始终是相同的：以您的产量x 1.2，这就是您需要的氮含量，” Mulvaney说。 “经证明的单产表示更高的产量需要更多的肥料氮。这是180°的错误。重要的是土壤中有多少氮。富裕的土壤需要的肥料氮更少，而贫瘠的土壤则需要更多的氮。”

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