ARTIFICIAL MANURES AND HORTICULTURAL PRACTICE. 47 



Table V. gives the quantity of nitrogen, phosphoric acid, 

 potash, and lime in average farmyard manure, in guano of 

 " good " and of " bad " quality, and in twelve different descrip- 

 tions of artificial manures, embracing those of a nitrogenous and 

 of a non-nitrogenous character. The quantities of the various 

 ingredients are given in pounds, in 1 ton weight of each kind of 

 manure. 



Table V.— Showing Selected Constituents in 1 Ton of Farmyard 

 Manure, and in 1 Ton of Various Descriptions of Artificial 

 Manures. Quantities in pounds. 



Description of Manure 



Nitrogen 



Phosphoric 

 acid 



Potash 



Lime 





lbs. 



lbs. 



lbs. 



lbs. 



Farmyard manure .... 



11 



8 



12 



16 



Guano — Good, No. 1 



357 



213 



182 



198 



„ No. 2 



156 



314 



74 



282 



„ Adulterated, No. 1 . 



4 



201 



2 



1,535 



No. 2 . 



13 



44 



0 



515 



Bone manure ..... 



80 



515 





1,200 



Superphosphate of lime . 





550 





716 



„ (double) . 





963 





300 



Basic slag 





336 





1,120 



Kainit salt ..... 







515 





Potash — Sulphate .... 







1,120 





„ Muriate .... 







1,792 





„ Phosphate .... 





851 



558 





Ammonia — Sulphate 



448 









„ Phosphate 



156 



1,120 







Nitrate of soda .... 



336 









„ potash .... 



291 





1,008 





It is seen that 1 ton of average quality farmyard manure 

 contains 11 lbs. of nitrogen, 8 lbs. of phosphoric acid, 12 lbs. of 

 potash, and 16 lbs. of lime. 



It has been found from numerous investigations that horti- 

 culturists use nearly 7 lbs. of nitrogen in the form of manure to 

 get back 1 lb. of nitrogen in the crop produced. Therefore, so 

 long as they use nitrogen in the form of farmyard or stable 

 manure, it is absolutely necessary to use immense quantities of 

 this material, owing to its low percentage of plant-food. 

 Gardeners find it more or less profitable to use this bulky 

 substance, but thanks to the investigations of scientific men, we 

 now know how to obtain the same result with far greater 

 certainty and at vastly less cost. 



