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Influence of Phosphorus and Potassium on Alfalfa Yield and Yield Components

Dep. of Agronomy, Purdue Univ., 915 West State St., West Lafayette, IN 47907-2054

View larger version (19K): [in this window] [in a new window]   Fig. 1. Influence of P and K fertilizer application on yield in 1998, 1999, and 2000. Contour plots are generated from the regression equations listed in Table 5 for total yield.

View larger version (28K): [in this window] [in a new window]   Fig. 2. Relationship between forage yield and mass shoot–1 at the first (May 1998) and last (Sept. 2000) harvests of the study.

View larger version (33K): [in this window] [in a new window]   Fig. 3. Regression of log of herbage mass plant–1 vs. log of plants m–2 as influenced by P (A) and K (B) fertilization in Harvest 1 (May) of 2000. Slopes of regression equations designated with the same letter are not different (P < 0.05). Data presented in Fig. 3A are averaged across the K fertilizer treatments, while data presented in Fig. 3B are averaged across the P fertilizer treatments.