Soils and Fertilizers for Pecans 93 



TABLE yil 



Influence of Fertilizers on the Yield, and Size and Quality of 

 Pecans on the Orangeburg Sandy Loam. (Schley Variety.) 

 Analyses by P. D. Boone. 



Yield Nuts Length 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 23 61 108 55 61.9 8.4 77.6 



Ammonia 28 59 101 58 63.4 9.0 76.6 



Potash 24 66 108 57 62.6 8.8 78.4 



P2O5-NH3-K2O 



9-3-3 10 51 96 61 46.4 9.8 72.4 



3-9-3 31 62 109 56 63.2 9.8 76.7 



3-3-9 29 66 109 54 62.9 9.0 78.6 



Aver, of 6 high phosphate fert. 25 64 108 56 61.9 8.9 76.8 



u .. u u ammonia '' . 27 61 108 57 63.1 9.3 76.5 



" *'" " potash " . 23 63 108 55 62.9 8.8 78.0 



No fertilizer 22 66 107 54 62.0 8.7 76.5 



Ammonia produced a higher yield on both soil types than 

 did phosphate or potash when these materials were used 

 singly. In a like manner, those fertilizer mixtures high in 

 ammonia yielded more nuts than did those high in either 

 phosphate or potash. In turn, each of these produced more 

 nuts than the unfertilized trees. The use of fertilizers in- 

 creased the size of the nuts slightly. Those high in ammonia 

 produced larger and better filled nuts than did those mixtures 

 high in phosphate or potash but low in ammonia. The kind 

 of fertilizer has a very marked influence on the protein- 

 content of the nut. When the constituents were used separately 

 ammonia gave a much higher content of protein in the nut 

 than did either the phosphate or potash. Nuts from the un- 

 fertilized trees contained the least protein. Fertilizers high 

 in potash develop oil in pecans. In some instances, fertilizers 

 high in potash produced nuts with an increase of as much as 



