92 Pecan-Growing 



Avith high proportions of potash and low proportions of phos- 

 phate and ammonia ; and six mixtures with high proportions 

 of ammonia and low proportions of the other two constituents. 

 Table VI gives the yield of nuts from the Stuart trees secured 

 in 1921 from each of these fertilizers and from the groups. 

 A large number of trees was used for each fertilizer treatment. 

 The figures in the table represent the average yield to a tree. 



TABLE VI 



I:^FLrENCE OF Fertilizers ox the Yield, axd Size and Quality of 

 Pecans on the Greenville Sandy Loam. (Stuart Variety.) 

 Analyses by P. D. Boone. 



Yield Nuts Lengrth Diam. Meat Protein Oil 



of nuts per of of in in in 



per tree pound Nut Nut Nut Meat Meat 



Fertilizer treatment Lbs. No. 64 in. 64 in. % % % 



Phosphate 3 52 94 60 46.8 9.1 72.5 



Ammonia 8 49 94 60 46.7 11.4 72.0 



Potash 3 59 93 60 46.1 10.5 73.9 



P2O5-NH3-K2O 



9-3-3 24 63 108 56 61.5 8.2 76.6 



3-9-3 13 50 96 62 48.2 10.2 73.3 



3-3-9 8 52 97 60 44.8 8.9 74.0 



Aver. 6 high phosphate fert... 7 51 98 61 45.2 9.6 73.2 



'' 6 " ammonia '' . . 9 49 100 62 47.1 10.2 72.4 



'' 6 " potash " .. 6 53 94 59 47.0 9.7 74.1 



No fertilizers 4 53 95 61 46.0 8.3 73.0 



The Orangeburg sandy loam is one of the principal soil 

 types oceuring in the pecan belt. It has a gray to brownish 

 surface soil which is underlain by a red subsoil. Nine-year- 

 old Schley, Stuart, and Alley trees were given twenty pounds 

 of fertilizer each in 1918, 1919, 1920, and 1921. In 1922, 

 thirty pounds to a tree were applied. The results for the 

 Schley variety in 1921 are given in Table VII. 



