6 The Bulletin. 



The soil analyses and field experiments point the way to the proper 

 use of fertilizer on these soils and to their improvement. Phosphates 

 must be used liberally and nitrogen, either in fertilizers or as soil- 

 improving crops, or both, must be used with the phosphates. How to 

 supply the phosphates most economically and to furnish the nitrogen 

 in soil-improving crops or in fertilizers is discussed in the report. 

 Other reports will follow from time to time giving results of field 

 experiments now in progress and outlined in this report, as well as 

 additional analyses of soils, as the work in surveying and mapping 

 the soils of the section progresses. 



