If we are to keep up crop yields and quality, many of our soils must have phosphate fertilizer. If we can’t get enough superphosphate because of the war, then what about the other phosphate fertilizers? Can they “pinch hit’’ for superphosphate?
Meldrum, H. R.
"Know Your Phosphates!,"
Farm Science Reporter: Vol. 6
, Article 2.
Available at: http://lib.dr.iastate.edu/farmsciencereporter/vol6/iss1/2