Helping the Farmers 



747 



Field to left sprayed ; strip on right unsprayed (showing mustard plants in blossom three 

 weeks after spraying) 



On left, oats and weeds from three harvester bundles from treated plat; on right, same from 



untreated plat 



Effect of spraying oat fields with iron sulphate solution for eradication of wild mustard. 



Wisconsin Station. Photos from U. S. Dep't of Agriculture 



