130 A YEAR IN AGRICULTURE 



The experiments in the value of standard fertilizers could 

 be tested in this way: 



Plots 10, 20, 30, 40 Nothing. 



" 11, 21, 31, 41 Apply farm manure (rate 3 or 4 tons per acre). 

 " 12, 22, 32, 42 Manure and lime (lime, 2 tons per acre). 

 " 13, 23, 33, 43 Manure, lime and phosphorus (phosphorus, 1 



ton per acre). 

 , " 14, 24, 34, 44 Manure, lime, phosphorus, and potassium (kai- 



nit, 400 Ibs. per acre). 



" 15, 25, 35, 45 Nothing, and remove all vegetable matter be- 

 fore it decays. 



Complete records of the treatment of the soil and of crop 

 yields, together with an accurate map of the plots, should be 

 kept. 



