RAPE-CAKE AS A MANURE. 

 Increase of produce over the unmanured field (see p. 186). 



Here, again, we see, as in the case of farm-yard 

 manure, guano, and bone-dust, that on no one field did 

 the effect of the rape-cake bear any visible proportion 

 or relation to the quantity used. 



1000 Us. of ground rape-cake gave increase of produce 



These experiments are interesting in reference to 

 the effect of the nitrogen supplied in the manure. A 

 comparison of the increase of produce obtained at Ober- 

 bobritzsch, severally by guano and ground rape-cake, 

 gives the following result in this respect : 



