CONTENTS 



PACE 



introduction . • ^ 



Operations in detail • • • -^J^ 



Field C ; summer fallow, winter grain 34() 



Field D ; summer fallow, winter grain • • 341 



Field E ; intensive cultivation, cotton and corn 343 



Field F ; intensive cultivation, corn and cotton 345 



Field G ; summer fallow, winter grain 346 



Field H ; continuous dry fallow 347 



Interpretation of results • 352 



Summary and conclusions • • 354 



ILLUSTRATIONS 



Vigorous Johnson grass rootstocks .Frontispiece 



Johnson grass rootstocks exhausted by close grazing with 



sheep Frontispiece 



Field E, August, 1915 342 



Field E, May, 1916, showing type of cultivator and sweeps used. . . .3i3 



Field E, June, 1916 343 



Field F, October, 1916. . .^ 344 



Johnson grass on Fields G and II, July, 1915 345 



Wheat on Field G, May, 1916; no Johnson grass in sight 346 



Field H, June, 1916; few Johnson grass plants appearing 347 



TABLES 



Field C, 40 acres ; sunnner fallow, winter grain 349 



Field D, 20 acres ; summer pasture, winter grain 349 



Field E, 10 acres ; intensive cultivation, cotton and corn 349 



Field F, 10 acres ; intensive cultivation, corn and cotton 350 



Field G, 20 acres ; sununer fallow, winter grain 350 



Field H, 20 acres ; continuous dry fallow 351 



Sunnnarv of costs and returns from Julv, 1915, to NovemI)cr, 

 1917.." ; 351 



