Cropping systems and fertility levels compared on the Southern Indiana Forage Farm /
Barber, Stanley A.,author.
Kaiser, Clarence James,1930-author.
Potts, Frank,author.
Purdue University.Agricultural Experiment Station.
Caption title.
"Project 655 (final)."
"April, 1965."
Cropping systems
Fertilizers
Cropping systems.
Fertilizers.