90 THE ESSENTIALS OF AGRICULTURE 



EXERCISES 



1. Using one of the rotations suggested in the text, draw up a 

 plan for a farm, showing (i) the number of fields, (2) what each field 

 will have growing on it for each of ten years, (3) the total acreage of 

 each crop each year, assuming each field to contain thirty acres. 



2. Would such a plan be practicable on a farm used for diversified 

 farming? Would there be enough of each crop each year to make 

 economical use of machinery and other equipment ? Would it produce 

 the proper proportions of each crop yearly to furnish feed for a live- 

 stock farm, or would there be an excess of certain crops in some 

 years ? Write out a list of the principles to be observed in planning 

 a crop rotation. 



3. If your local region contains an illustration of badly washed 

 soils, visit the place, and plan a way of stopping the erosion. If the 

 owner will allow you to try the experiment, carry out your plan, and 

 watch the results. 



4. Try to get a farmer who pastures his clover until plowing time 

 to leave one acre unpastured, plowing under all the clover on this 

 acre. Watch the effect on the next crop. 



REFERENCES 



AGEE, ALVA. Crops and Method for Soil Improvement, chap. xv. The 



Macmillan Company. 



FLETCHER, S. W. Soil, chaps, xi-xii. Doubleday, Page & Company. 

 HOPKINS, C. G. Soil Fertility and Permanent Agriculture, chaps, xii-xv. 



Ginn and Company. 

 LIPMAN, J. G. Bacteria in Relation to Country Life, chap. xxiv. The 



Macmillan Company. 



SNYDER, HARRY. Soils and Fertilizers, pp. 255-284. Chemical Publish- 

 ing Company. 



THORNE, C. E. Farm Manures, chap. xii. 

 VIVIAN, A. First Principles of Soil Fertility, chaps, iii, ix, and x. Orange 



Judd Company. 



VOORHEES, E. B. Fertilizers, chap. i. The Macmillan Company. 

 Renovation of Worn-out Soil, Farmers' Bulletin 245, United States 



Department of Agriculture. 

 Leguminous Crops for Green Manure, Farmers' Bulletin 2/8, United 



States Department of Agriculture. 

 Conservation of Soil Resources, Farmers' 1 Bulletin 342, United States 



Department of Agriculture. 



