14 



xM ASS. EXPERIMENT STATION BILLETIN 281 



Fig. 6. — Upper — Phosphorus alone (Plot 4 — 2P) did not cause much clover to appear. 

 Middle - Potassium alone (Plot 5 — 2K) was more effective. 

 Lower-Phosphorus and potassium i Plot 9 — 2P, 2K) was most effective. 

 (Exp.B. series I, unlimed, 1923.) 



