SOILS 129 



Use the same amounts and forms for the lime, nitrogen, 

 phosphorus, and potassium in each application given above 

 as directed in jars Nos. 2, 3, 4 and 5. The best way to incor- 

 porate these fertilizers in the soil is to apply them in the 

 form of solution. 



Sow in each pot equal amounts of wheat or oats, and give 

 the samples the same care and attention regarding light, 

 temperature, and moisture. Note the growth of the plant 

 from week to week. The growth of the plant should indicate 

 the limiting plant-food element in the type of soil under 

 observation. Record fully this experiment in the notebook. 



16. Outdoor plot experiments with various fertilizers in 

 methods of soil improvement. For a demonstration plot at 

 the school, the following plan is feasible, providing labor is 

 available and a long time policy of management is possible. 



Arrangement and Numbering of Plots 

 10 11 12 13 14 15 



20 21 22 23 24 25 



30 31 32 33 34 35 



40 41 42 43 44 45 



General suggestions: Every boundary line should be a 

 grass or gravel walk three feet wide. Every square should 

 be 18 by 18 feet. Before harvesting crops, for records, each 

 plot or square should be cut to a perfect rod square. For 

 yield per acre, multiply by 160. 



Rotations should be conducted as follows : 



Plots 10, 11, 12, 13, 14, 15 Continuous corn crops. 

 " 20, 21, 22, 23, 24, 25 Corn and oats rotation. 

 " 30, 31, 32, 33, 34, 35 Corn, oats and clover rotation. 



40, 41, 42, 43, 44, 45 Corn, oats, clover and wheat rotation. 



