Effect of Nitrogen, Phosphorus, and Potassium on Yield and Leaf Analysis of Southern Pea1

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Abstract
Although variation between years was large, yield responses were obtained from N in 3 years, P in 2 years, and K in 1 year of the 4 year test. Results indicated that application levels should be 25-50 lb of N/A, 11-22 lb of P/A, and not over 42 lb of K/A. A complete fertilizer supplying 50-22-42 lb of N-P-K/A gave the highest average yield. Fertilizer treatments had little effect on leaf analysis at harvest in 1963, and correlation coefficients were not significant for leaf mineral concentration of N, P, K, Ca, Mg, Na, Mn, Fe, B, Zn, Al, Mo, Ni, Sr, Ba, and Ti with yield. Significant negative correlation coefficients were found for yield with leaf Cu, Zn, Al, and Ti, but they were all -.36 or less.

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