SPRING AXl^ AUTrMX SOWX MAMRKS :,:; 



in the soil at the close of that period for the umnanun-d I'lot 

 3, and Plot 2 receiving farmyard manure. The toj) 1> inc-lics u[ 

 soil only are considered, because the analyses do not indicate 



Total Produl 

 per Acre 



Plot 



Minerals 

 only. 



7 15 17 16 



Minerals Minerals Minerals 



+ 861b.N. +86lb.N. -►86lb.N. e6!b.N. 



Sprinf Autumn. for Previous a^'ter Miner«!i only 



Crop. • in Previous Year. 



^^^Grain per Acre. lb. 



l^^H Straw per Acre, lb. 



Fui. 8.— Conipanitive KfTcL-ts on Wheat of .\im.ioniuin-saIt.s npi.lieil at (lifTtTctit times. 

 Averages for 51 years (1^52-1902). Plots 7 and 1'., 25 years (.nly (1>7S-19U2). 



that any appreciable amoimt of ()r:janic matti-i- has t».und its 

 way into the subsoil. 



It will l^e seen that of al)out 1(),(MM) lb. of nitrogen supplied 



