1998 Vol X, No. Injecting liquid phosphate gave slightly better yields than surface-broadcast applications.
Alfalfa responds economically to a phosphate rich soil.
Presently, it is suggested that P fertilizers should be applied at two to three times the annual recommended rate at the time of establishment when the fertilizer can be incorporated. High rates should provide a P fertility foundation with the potential for sustaining stands for several years. The objectives of this work were to evaluate phosphorus sources, application rates, application timing, and alternative methods of applying phosphorus fertilizer for alfalfa production. The experiment was established at the South Central Research Station near Chickasha, OK, on September 9, 1992. The whole study included 22 treatment combinations of fertilizer and weed density.