Vol. XVIII DECETvIBKR 15, 1919 No. 6 



JOURNAL OF 



AGRICULTURAL 

 RESEARCH 



CONXKNTS 



Losses of Organic Matter in Making Brown and Black 

 Alfalfa - -- - - -- - - 299 



C. O. SWANSON, L. E. CALL, and S. C. SALMON 



^Contribution from Kansas Agricultural Experiment Station) 



Cotton Rootrot Spots _______ 3tS 



C. S. SCOFIELD 

 (Contribution from Buteau of Plant Industry } 



Apple-Grain Aphis - - - - - - - -311 



A. C. BAKER and W. F. TURNER 

 (Contribution from Bureau of Entomology) 



Sunflower Silage ---__--> 325 

 R. E. NEIDIG and LULU E. VANCE 



(Contribution from Idaho Asricultural Eiperlment Station) 



Effect of Oxidation of Sulphur in Soils on the Solubility ot 

 Rock Phosphate and on Nitrification - - - - 32f 



O. M. SHEDD 



( Contribution from Kentucky Agricultural Experiment Station) 



PUBUSHED BY AUTHORITY OF THE SECRETARY OF AGRICULTURE. 



WITH THE COOPERATION OF THE ASSOCIATION OF AMERICAN 



AGRICULTURAL COLLEGES AND EXPERIMENT STATIONS 



^VASHINGXON, D. C. 



WAIHINOTON I aOVeaNMEHT MIIMTUNI ePFKB I l»l» 



