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he availability of phosphorus and nitrogen are major limitations to plant growth, and as such our agricultural processes apply these nutrients at high concentrations to crop plants through fertilizer.Although fertilizer application has greatly enhanced food production it comes at a significant price: the chemical fixation of nitrogen depends on high levels of fossil fuels, making fertilizers a significant cost of food production and a major cause of greenhouse gas emissions from agriculture.
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Capoen et al. (2008) studied this question.
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