MANURIAL VALUE OF FEEDING STUFFS 279 



purchased and fed out, and also, under certain conditions, for the 

 fertilizing value of grains produced on the farm and fed to stock. In 

 order to furnish data to guide the valuers who serve in settlement 

 between landlord and tenant, after full and extended study Lawes and 

 Gilbert and later Voelcker and Hall of the Rothamsted Experiment 

 Station drew up tables showing the compensation to be allowed for the 

 fertilizing value of various feeds. The recommendations, as revised in 

 1913 and adopted by the Central Association of Agriculture and Tenant 

 Right Valuers, 7 are that the tenant shall be credited as follows for all 

 manure resulting from feeding purchased feeds to stock on the lease- 

 hold: 



For all unused manure or that which has been recently applied to 

 the land without a crop being grown thereafter, a credit of three-fourths 

 of the total value of the phosphoric acid and potash in the feed is 

 allowed. Because a greater loss of nitrogen commonly occurs in stored 

 manure than in manure dropped in the fields by animals at pasture, a 

 credit of 70 per ct. of the total value of the nitrogen is allowed when 

 the stock have been fed at pasture, and of only 50 per ct. when they 

 have been fed in barn or yard. 



When one crop has been grown since the application of the manure, 

 a part of the fertility thereby being used up, the credit allowed is only 

 half that stated above. It is realized that the beneficial effects of farm 

 manure persist much longer than 2 years, but owing to the difficulties 

 of checking records for a longer period, the compensation is not extended 

 over a greater time. The principles of the English law, as here set 

 forth, should be drafted into every lease drawn between landlord and 

 tenant in this country. 



439. Composition and value of fresh manure. Even tho the value of 

 manure produced by animals of the same kind depends primarily on 

 the nature of the feed supplied, it is important to note the approximate 

 composition of manure from the different classes of farm animals. The 

 following table, adapted from Van Slyke, 8 shows the percentage of 

 water and the amount and value of the fertilizing constituents per ton 

 in fresh manure, including feces, urine and bedding, from the different 

 farm animals. 



Composition of one ton of average manure from farm animals 



Phosphoric 



Water Nitrogen acid Potash Value 



Per ct. Lbs. Lbs. Lbs. Dollars 



Horse manure 78 14 5 11 3.92 



Cow manure 86 12 3 9 3.24 



Sheep manure 68 19 7 20 5.69 



Pig manure 87 10 7 8 3.05 



Horse and sheep manures contain less water than that of cows or 

 pigs, and are known as "hot manures " because their low water content 



'Journ. Boy. Agr. Soe., England, 74, 1913, pp. 104-119. 

 'Fertilizers and Crops, p. 291. 



