PREFACE 



This is the fifteenth edition of "Food for Plants." The work 

 has come to have a standard place in American Farm litera- 

 ture. It includes results of experiments on Highlands Experi- 

 mental Farms, under the personal direction of the late Pro- 

 fessor E. B. Voorhees, of the New Jersey Experimental 

 Station. 



Crop utilization and relative agricultural efficiency of nitro- 

 gen in various commercial materials were outstanding points 

 of his New Jersey work. The record of the first twenty years' 

 work on the availability of nitrogen in Nitrate of Soda is re- 

 produced in this volume. It includes the work of Professor 

 Voorhees up to the time of his death. It is regarded as one of 

 the most important contributions to Soil Science which has 

 been made in this country. 



Results of experiments also set forth field work intended 

 as demonstrations in farm practice of what may be accom- 

 plished by the rational use of Nitrate of Soda under average 

 farm conditions in a typical hay and dairy section of New York 

 State. 



The results were also published in "Grass Growing for 

 Profit" and "Growing Timothy Hay for Market." These prac- 

 tical contributions were based on actual scientific data. Re- 

 sults of studies of methods of crop growing, from the prepara- 

 tion of the land to handling and marketing, also appeared in 

 these bulletins. 



The Corn for Ensilage Experiments recorded are regarded 

 as of first value. The United States Government made studies 

 of the ensilage grown with Nitrate which was regarded as of 

 high feeding quality. 



Apple growing, which is at present our most important 

 money crop in the northern states, is treated in an up-to-date 

 manner in a chapter by itself. 



The use of Nitrate on Sugar Cane is set forth briefly. 



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