18S 



Food for Plants, 



On Uncultivated Li(/hl or Medium Soils. 



Kxhaustcd Per cent, rpmaining in soil unexhausted 

 Kind of F Ttilizer Used (in years) at the end of each year 



12 3 4 S 6 7 



Limo ] 7o 60 40 30 20 15 . . 



Bone meal 4 GO .'U) 10 00 00 00 .. 



Phosphatic guano 4 50 JO 10 00 00 00 .. 



Dissolved bones and ])lain 



superphosphates 3 20 10 5 00 OU 00 00 



High grade animoniates, 



guanos 3 30 20 OO no 00 00 00 



Cotton-seed meal 4 40 30 20 10 00 00 00 



Barnyard manure 4 60 30 10 OO 00 00 00 



(hi I' luultiidlcd Pasture Land. 



Per cent, remaining in the soil unexhausted 

 Kind of Fertilizer I'.sed at the end of each year 



12 .? 4 5 6 r 



Lime 15 80 70 60 50 45 40 35 



Bone meal 7 60 50 40 30 20 10 00 



Phosphatie guano 6 50 40 30 '^0 10 00 80 



Dissolved bone, ete 4 30 20 10 00 00 00 00 



High grade ;)iiniioiii;if('(l 



guanos 4 30 20 10 00 00 00 00 



Cotton-seed meal 5 40 30 20 10 00 00 00 



Barnyard manure 7 60 50 40 30 20 10 00 



The figures given above are used in fixing the rental 

 for new tenants. In this country no such careful esti- 

 mates have been made. 



Amounts of Nitrogen, Phosphoric Acid, and Potash Found 



Profitable for Different Crops Under Average 



Conditions Per Acre. 



{Taken Chiefly from New Jersey Experiment Stations Reports.) 



Phosphoric 

 Nitrogen, Acid Potash 



Pounds Pounds Pound.s 



Wheat, rye, oats, coin 16 40 30 



Potatoes and root crops 20 25 40 



Clover, beans, peas nnd otiiei- leguminous 



crops . . 40 60 



Fruit trees and small fruits 25 40 75 



General garden produce 30 40 60 



Rotation in Crops. 



In the changed conditions of agriculture elaborate 

 systems of crop rotation are no louger necessary. With 

 the help of chemical manures and the Judicious use of 

 renovating crops farmers are no longer subject to rigid 



