92 CHEMICAL MANURES. 



No. 6. Fertilizer without phosphate of lime. 

 No. 7. Fertilizer without potash. 

 No. 8. Fertilizer without lime. 

 .No. 9. Fertilizer without minerals. 

 No. 10. Land without any fertilizer. 



When you have to do with a very large farm, one field is not suf- 

 ficient, because of the variation which the composition of the soil 

 shows in the principal divisions of a domain ; it will be wise, then, 

 to multiply the test, but on a less scale. One square divided into 

 four parts will be enough for the experiments. They may be reduced 

 to the following terms : 



No. 1. Complete fertilizer. 

 No. 2. Mineral fertilizer without azote. 

 No. 8. Azotic fertilizer without minerals. 

 No. 4. Without any fertilizer. 



Several corners of the field reserved for this purpose will not inter- 

 fere with its cultivation, and will show when, for each grand division, 

 to have recourse to azotic or mineral fertilizers. 



To those who look with a kind of fright at so large a number of 

 tests, I will reply by an argument of facts. In all the large farms 

 where the chemical fertilizers have been introduced, these experi- 

 mental squares have been used. The director, proprietor or farmer 

 likes to show them to those who visit him, and after some hesitation 

 he always ends by regulating the quantities of the agents composing 

 his fertilizer by their growth. 



Let us now occupy ourselves with the fertilizers most convenient 

 for these experimental farms. 



SERIES FOB WHEAT. 



(Parcel No. 1.) 

 Barnyard manure, 53,333 Ibs. 



(Parcel No. 2.) 



Barnyard manure, 26,666 Ibs. 



Condensed Complete Fertilizer No. 1. 



(Parcel No. 3.) 



The acre. 

 Quantity. Price. 



Acid phosphate of lime 533 Ibs. $8.10 



Nitrate of potash 355 " 20.94 



Sulphate of ammonia 222 " 9.50 



Sulphate of lime..*. 312 .59 



Total 1432 Ibs. Cost... $39.13 



Complete Fertilizer No. 1. 

 (Parcel No. 4.) 



Acid phosphate of lime 355 Ibs. $5.40 



Nitrate of potash 177 " 10.47 



Sulphate of ammonia 222 " 9.50 



Sulphate of lime 312 .59 



Total... .1066 Ibs. Cost... $25.96 



