INDEX. 



Page. 



Agriculture, dry-land, importance of crop rotation, studies and experiments.. 8-12, 



67-72 



investigations, collection and reliability of data 12, 13 



field work, scientific staff 12 



Barley, average price per bushel in various States, 1900-1909 25, 26 



continuous cropping, average yield and value per acre, 1900-1909 27, 28 



comparison with alternate cropping and summer 



tillage, experiments 14-20 



crop-rotation tests, average yield and value per acre, 1906-1909 32-33 



rotations, comparison 21-40 



with continuous cropping, value per acre. 39, 40-45 

 yield per acre. 39,40-45 



cropping systems, comparison of yields per acre 17, 18, 26, 27 



tillage methods, average production per acre, studies 8-12, 14-20, 67-72 



Burr, W. W., and Snyder, W. P., article on summer tillage 71-72 



Conservation, moisture. See Moisture, conservation. 



organic matter in soil, description of rotations 55-65 



Corn, average price per bushel in various States, 1900-1909 25-26 



crop-rotation tests, average yield and value per acre, 1906-1909 28-34 



rotations, comparison 20-40 



cultivation, study of methods 58-59 



fodder, cost and value 47 



rotation tests, average yield and value per acre, 1906-1909 28-34 



stubble, disked, comparison with summer tillage as preparation for wheat 



or oat crops 45-48 



returns from crop 45-48 



disking, comparison with plowing, for spring wheat 49 



tillage methods, average production per acre, studies 8-12, 67-72 



Cropping, alternate, and summer tillage, comparison with continuous cropping, 



experiments 14-20 



continuous, and summer tillage, arid regions, conclusions 18-20 



comparison with alternate cropping and summer tillage, 



experiments 14-20 



crop rotation 20-40 



methods, various grains, average yield and value per acre, 1900-1909. 26-27 

 States, average yield and value per acre, 1900-1909. 26-27 



various systems, wheat, oats, and barley, experiments 14-20 



Crops, classification 65-67 



rotation, and cultivation methods, Great Plains area, purpose of inves- 

 tigations 7-8 



results of investi- 

 gations 8-12 



sufficiency of the 

 data submitted. 12-13 



187 75 



