Not quite assured.
D000383:Agriculture / Q000191:economics / Q000379:methods*; D003247:Conservation of Natural Resources / Q000379:methods / Q000639:trends*; D018556:Crops, Agricultural / Q000378:metabolism; D005308:Fertilizers / Q000032:analysis / Q000191:economics / Q000706:statistics & numerical data; D005523:Food Supply / Q000706:statistics & numerical data; D019015:Geologic Sediments / Q000737:chemistry; D007391:International Cooperation; D010710:Phosphates / Q000032:analysis / Q000191:economics / Q000378:metabolism / Q000600:supply & distribution*; D035501:Uncertainty
D005308:Fertilizers; D010710:Phosphates