TILLAGE AND FARM MACHINERY 105 



Courtesy U. S. Dept. of Agriculture 

 Fig. 55a. A field in poor tilth. Crops in such cloddy soil have a 

 small chance. 



Courtesy U. S. Dept. of Agriculture 

 Fio. 55b. A field in good tilth. The best time to cultivate a crop is 

 before planting it. 



Feeding Plants. We know that plants can use 

 only the plant food that is prepared for them. If 

 it is not in the right form, it makes no difference 



