Living on air I 1 CONTENTS It’s impossible to “live on air,” naturally Introduction Why do we need to add nitrogen? Why do we need to add fertilizers? Living on air Growing with nitrogen From air to plant nutrient Producing nutrient nitrogen From nutrient back to air Loss of nutrient nitrogen Keeping the nitrogen cycle in balance with supplementary nitrogen Pulled out of thin air Adding nutrient nitrogen Nutrient nitrogen no longer comes only from natural sources Ready for the future 19 9 11 13 15 7 3
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