1922.] PUBLIC DOCUMENT — No. 31. 11a 



Project 12. "Apple variety fruit spur study." 



Professor Shaw and Assistant Professor Drain. 



This project comprises a detailed study of individual fruit 

 spurs, in an endeavor to define the service and functions of 

 pruning and fertilizing in modifying fruit-bud formation and 

 fruit production. The field work is checked by chemical 

 study of the elaboration of food in the fruit spur, and by 

 micro-chemical tests. 



Project 14. "Winter injury of brambles." 



Professor Shaw, Professor Morse and 



Assistant Professor Clark. 



This project, co-operative between the Departments of 

 Botany, Chemistry and Pomology, was organized to investi- 

 gate the cause of the winterkilling of brambles as apparently 

 brought about by differential fertilization with potash salts. 

 This winterkilling was observed again and again on some of 

 the plot work initiated by Dr. Goessmann years back, but was 

 never satisfactorily explained. In an attempt to solve this 

 problem both chemical and physiological tools are being used. 



Soil Maxagemext and Fertilizer Tests. 



Department of Agriculture, 



Project 1. "Comparison of nitrogenous fertilizers." 



Professor Morse and Assistant Professor Gaskill. 



This investigation is co-operative with the Department of 

 Plant and Animal Chemistry. While the experiment was 

 originally instituted to study the relative value of different 

 sources of fertilizer nitrogen, the greatest contributions have 

 been incidental to what was considered the main objective. 

 The possibility of maintaining yields almost indefinitely without 

 the use of fertilizer nitrogen has been demonstrated. Certain 

 problems of soil acidity have been studied, and the presence in 

 acid soils of certain toxic substances experimentally proved. 

 The latest contribution from this field was in the publication of 

 Bulletin No. 204, entitled "Thirty Years' Experience with 

 Sulfate of Ammonia." 



