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A Soil Association report called “A rock and a hard place: Peak phosphorus and the threat to our food security” says declining supplies and higher prices of phosphate rock threaten global food security.

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Two articles on synthetic nitrogen fertilizer and nitrate pollution in the Gulf of Mexico.

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Giving too much phosphorus to wheat and barley plants increases the amount stored as phytate, rather than as more digestible forms of phosphorus. Livestock that are fed high-phytate grains excrete more phosphorus in their manure, which can pollute water.

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Nitrous oxides are associated with fertilizer nitrogen use and, like soil carbon levels, can be influenced by tillage regimes. ARS soil scientist Rod Venterea and colleagues have shown that over a two-year period, the combination of anhydrous ammonia fertilizer use and no-till can lead to alarmingly high nitrous oxide emissions.

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