Symbiotic Nitrogen Fixation and Phosphorus Acquisition. Plant Nutrition in a World of Declining Renewable Resources

Since 1960, the world's population has doubled to 6 billion people. During the next 40 years, the population is projected to increase and stabilize at 8 to 9 billion people (Table I1). In the 1960s, agricultural specialists predicted that food production would not keep pace with the burgeoning