Fig. 15.-Average annual yield of pecans as affected by
cover crops and fertilizers.
1-A. Austrian peas and C. spectabilis with superphosphate and
 sulfate of potash.
ST? A ------


LJ



z
<C


000-


0oo0


S-J. us r an peas aund I. spectabuilis withl sulfae of ammonia,
 superphosphate and sulfate of potash.
 2-A. Hairy vetch and C. spectabilis with same fertilizer as 1-A.
800oo 2-B. Hairy vetch and C. spectabilis with same fertilizer as 1-B.
 3-A. Natural growth only with same fertilizer as 1-A.
 3-B. Natural growth only with same fertilizer as 1-B.
700 4-A. Oats and C. spectabilis with same fertilizer as 1-A.
 4-B. Oats and C. spectabilis with same fertilizer as 1-B.

600o


500-


400- FROTSCHER STUART d"


300- -


200 I c






 I-A 1-B Z-A 2-B 3-A 3-B 4-A 4-B- Plots-.-A 1-B 2-A 2-B 3-A 3-B 4-A 4-8