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- due to weather or input prices, the average gross phosphorus balance (GPB) per hectare of utilised agriculture area (UAA) in EU-28 decreased from 3.9 to 1.2 kg P per ha UAA (see Figure 1) from 2004 to 2015. It means that the surplus is only around ...27 KB (4,024 words) - 13:59, 2 October 2018