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Leigh tells the story of how humans have used their ingenuity throughout history to maintain soil fertility, and to avoid famine through productive agriculture.

Nitrogen in agriculture --- Crops and nitrogen. --- Nitrogen and crops --- Nitrogen --- Agriculture --- Crops and nitrogen --- History. --- Nitrogen fertilizers --- Nitrogenous fertilizers --- Fertilizers

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Cropping systems --- Crops and water --- Crops and nitrogen --- Cropping systems. --- Crops and water. --- Crops and nitrogen. --- 631.811.1 --- 631.811.91 --- 631.58 --- 631.432 --- 631.416.1 --- Nitrogen and crops --- Nitrogen --- Nitrogen in agriculture --- Agrohydrology --- Crop-water relationships --- Water and crops --- Water-crop relationships --- Plant-water relationships --- Water in agriculture --- Irrigation farming --- Agricultural systems --- Soil management --- Nitrogen. N --- Water --- Particular cultivation systems --- Groundwater. Agricultural hydrology --- Conferences - Meetings --- 631.416.1 Nitrogen --- 631.432 Groundwater. Agricultural hydrology --- 631.58 Particular cultivation systems --- 631.811.91 Water --- 631.811.1 Nitrogen. N