AGRICULTURE FOR SOUTHERN SCHOOLS. 19 
essential ingredients are concerned and such mixtures as are needed 
for the important local crops prepared. All ingredients should be 
weighed accurately. 
Record and re fort: Each student should keep a record of the 
weights and percentage composition of the materials used and com- 
pute the cost in comparison with the ready-mixed fertilizers sold 
on the market. 
Note. — In connection with this exercise the students should submit formulas 
of other mixtures which would prove economical. 
Lesson 27. — Barnyard Manure. 
1. Benefits of barnyard manure. 
2. Comparative value of different manures. 
3. Factors influencing the value. 
Lesson 28. — Barnyard Manure — Continued. 
1. Care and management of manure. 
2. Applying manure to the land. 
Special references : Barnyard Manure, Farmers' Bulletin 192 ; Farm 
Manures and Fertilizers, U. S. Dept. of Agriculture, States Relations 
Service Doc. 30, Ext. S. "A" 77. 
Exercise 18. — A Field Study of the Care and Use of Barnyard 
Manure. 
Purpose: To impress upon the minds of the students the results 
of proper care and use of barnyard manure in contrast with the 
results of improper use. 
Directions : The class should visit a farm where manure is left in 
open piles to leach away. In making a visit to any farm where im- 
proper methods are to be noted, judgment and tact must be used or 
offense will be given. It may be necessary for the class to merely 
make a casual observation in passing such a farm on the way to visit 
a farm where favorable comments may be made. In visiting a farm 
where proper methods are used in caring for manure the students 
should observe the effect on the growing crops and upon the farm as 
a whole. 
Record and report: Each student should take notes upon what he 
sees and make a written report. Answers to the following questions 
should be included in the report : What is your estimate of the value 
of a ton of barnyard manure in the district ? In what ways may this 
value be lessened? What is the most practical means of conserving 
the liquid manure? How may leaching be prevented? What is the 
most efficient method of removing manure from the stable? Is it 
practical to remove it to the land each day throughout the year? Is 
a manure spreader a paying investment for the farms visited ? What 
is the best means of caring for the manure on these farms? 
