A new type of analysis, conducted by Dr. Robert Mullen, director of agronomy for PotashCorp, has shown a decline in soil nutrient levels nationwide.

 

“I conducted an analysis of soil trends within (Ohio) using fertilizer consumption and nutrient removal as a function of crop yield,” said Mullen. “I’ve done it at the state level and now we’re doing a similar analysis across the United States and North America as a whole.”

 

Mullen’s analysis combines nutrient removal records with additional factors such as fertilizer consumption information and manure data from the USDA and the Association of American Plant Food Control Officials to present a “nutrient balance” on a state-by-state basis.

 

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