Thus, farmers spend millions of dollars on phosphorus fertilizers but only a small proportion of the phosphorus they apply to their fields is actually available to be utilized by their crops.
(farmers; spend; millions of dollars; on phosphorus fertilizers) (the phosphorus; apply; to their fields) (only a small proportion of the phosphorus; is actually; available to be utilized by their crops)
farmers the phosphorus only a small proportion of the phosphorus
spend apply is actually
millions of dollars on phosphorus fertilizers
to their fields
available to be utilized by their crops