LIST OF TABLES xiii 



82. Ohio Experiments : Five-year Rotation . . 442 



83. Ohio Experiments : Potatoes, Wheat, Clover .... 448 



84. Experiments at Strongsville, Ohio 452 



85. Illinois Experiment Plots, Urbana 457 



86. Comparable Corn Yields, Illinois Experiments .... 459 



87. Crop Yields on Sibley Field, Illinois ....... 462 



88. Crop Yields on Bloomington Field, Illinois . . . . 464 



89. Crop Yields on Antioch Field, Illinois 467 



90. Crop Yields on Sand Land, Illinois 468 



91. Corn Yields on Deep Peat Soil, Illinois 471 



92 and 93. Corn Yields on Peaty Alkali Soil, Illinois . . 473, 475 



94. Crop Yields in Southern Illinois, Odin Field .... 478 



95. Crop Yields in Southern Illinois, Du Bois Field . . . .481 

 96 and 97. Crop Yields on Worn Hill Land, Vienna, Illinois . 483, 485 

 98 and 98.1. Pot-culture Experiments with Worn Hill Soil . . 486,487 

 99. Southern Iowa Field Experiments 488 



100. Georgia Fertilizer Experiments with Corn ..... 490 



101. Rainfall Records at Experiment, Georgia ..... 49* 

 1 02 and 103. Georgia Fertilizer Experiments with Cotton . . 492, 493 



104. Alabama Field Experiments with Cotton 495 



104.1. Louisiana Field Experiments 496 



105. Minnesota Soil Investigations 499 



1 06 and 107. Canadian Field Experiments ..... 508,511 

 108 and 109. Comparison of Pot Cultures and Field Experiments . 513, 514 

 no. Composition of Farm Manures . . . . . -543 

 in. Composition of Pulverized Dried Manures 545 



112. Composition of Manure before and after Exposure . . . 547 



113. Composition of Bean Crop at Different Periods of Growth . . 550 



114. Composition of Barley at Different Periods of Growth . . . 552 



115. Plant Food removed from Plants by Leaching .... 555 



116. Nitrogen in Rothamsted Drainage Waters 557 



117. Soluble Nitrogen in Cropped Soils, Rothamsted .... 55^ 



118. Ammonia Fixation and Nitrification 563 



119. Effect of Soil Preparation, Cultivation, Irrigation, and Fertilization 



on the Yield of Corn 578 



120. Value of Land, measured by Crop Yields ..... 5^7 



121. Composition of Animal and Plant Products 602 



