USE OF WATER BY SPRING WHEAT ON THE GREAT PLAINS 



By 



JOHN S. COLE, Agronomist, and 



0. R. MATHEWS, Assistant Agronomist in Dry-Land 



Agriculture with an introduction by E. C. CHILCOTT, Agriculturist 



in Charge of the Office of Dry-Land Agriculture Investigations, Bureau of Plant Industry 



CONTENTS 



Pago 



Introduction 1 



Statement of the problem 2 



Source, character, and method of study of the data " 3 



Daily rate of the use of water while the crop is growing rapidly 6 



Rate of the use of water as the soil moisture approaches depletion il 



Rate of the use of water during the growing season 12 



Quantity of water used during the growing season 20 



Correlation between the use of water and the yield at individual stations ........... 26 



General discussion of the results 30 



Conclusions 32 



WASHINGTON 



GOVERNMENT PRINTING OFFICE 



1923 



