S14 HOW CROPS FEED. 



ing. Kitthauscn gives some data concerning two clover 

 crops of the year 1854, from a loamy sand, portions of 

 which were manured, one with ashes, others with gypsum. 

 The following statement gives the produce of the nearly* 

 fresh and of the air-dry crops. 



Weight in pounds per acre. 



It is seen that while in both cases the fresh manured 

 crop greatly outweighed the unmanured, the excess of 

 weight consisted of water. In fact, the unmanured plots 

 yielded inore hay than the manured. The manured clover 

 was darker in color than the other, and the stems were 

 large and hollow, i. e., Ly rapid growth the pith cells were 

 broken away from each other and formed only a lining 

 to the stalk, while in the unmanured clover the pith re- 

 mained undisturbed, the stems being more compact in 

 structure. (H. C. G., p. 369.) 



The Quantity of Soil-water most favorable to Crops 



has been studied by Ilienkoff and Ilellricgel. The former 

 {Ann. der. Chem. k. Ph. 136, p. 160,) experimented with 

 buckwheat jjlants stationed in pots filled with garden 

 eartli. The pots were of the same size and had the same 

 exposure at the south side of an apartment. The plants 

 received at each waterinsc in 



* The clover was collected from the surface of a Saxon square ell, and was 

 somewhat wilted before coming into Ritthauseu's hands. The quantities above 

 given arc calculated to Euglith acres and pounds. 



