i921.] 



961 



The variations on the unchalked plots are characteristic of 

 land beginning to show signs of sourness. 



Comparison of Organic and Ordinary Artificial Manures. — 



Eeference has several times been made in these notes to the fact 

 that organic manures are not worth a specially high price to the 

 ordinary arable farmer, although they may have particular 

 value to the gardener and the market gardener because of their 

 convenience in handling and the fact that they are fool proof. 



A similar conclusion is arrived at by Dr. J. G. Lipman and 

 A. W. Blair, of the New Jersey Experimental Station, whose 

 results are so important that they deserve full consideration. 

 The results are as follows, worked out on the basis of 1/20-acre 

 plot : — 







Increase 



over Control for 5 \ears, 1913-17, 



Plot. 



Dressing. 



Unlimed. 



Limed. 







Total 

 Grain. 



Hay, Straw, 

 Stalks, &c. 



Total 

 Grain. 



Hay, Straw, 

 Stalks, &c. 



9 



10 

 11 

 12 

 13 

 14 

 15 

 5 

 6 

 8 



Nitrate of soda 



Nitrate of lime 



Sulphate of ammonia 

 Nitrolim 



Dried blood 



Fish 



Tankage 



Cow manure ... 

 Horse manure 



Nitrate of soda (half dfossing) 



1,917 

 1,262 

 1,232 

 1,522 

 1,157 

 1, 557 

 1.242 

 2,592 



547 



7,622 



7,107 



3,367 



4,532 " 



4,637 



5,847 



3,777 ./ 

 10,332 

 11,837 



2,667 



1,097 

 2,057 

 2,192 

 1,667 

 1,747 

 1,572 

 1,492 

 1,237 

 1,332 

 1,322 



4,710 

 6,955 

 7,020 

 4,675 

 4,505 

 3,660 

 3,275 

 5,505 

 5,875 

 2,440 



The quantities of the various fertihsers on Plots 9-15 con- 

 tained the same amount of nitrogen, equal to 320 lb. nitrate of 

 soda per acre. Horse and cow manure were supplied at heavier 

 rates, viz., 32,000 lb., or nearly 15 tons, per acre. 



Taking the average of the organic manures and of the artificials 

 the results work out as follows : — 





Average Yield of Dry Matter. 



Percentage Nitrogen recovered. 





Unli 



med. 



Limed. 



Unlimed. 



Limed. 





1908-12 



1913-17 



1908-12 



1913-17 



1908-12 



1913-17 



19i 8-12 



1913-17 





lb. 



lb. 



». 



lb. 



Pe)- cen t. 



Pe?' cent. 



Percent. 



Pej'cent. 



Average of 4 artificial* — 

 Siraw, &c 



6,002 

 14,«86 



3,631 

 11,715 



6,380 

 15,535 



4,211 

 13,280 



j 40-1 



29-4 



49 



33-3 



Average of 3 organic 

 materials — 



Straw, &c 



5,603 

 13,503 



3,467 

 10,812 



6,075 

 12,597 



4,062 

 11,253 



1 27-3 



24 



29 



27-1 



