16 



CANADIAN FARM YEAR BOOK. 



Law of Minimum. 



No matter how great the quantity 

 of crop producing elements present 

 that element in the smallest quantity 

 -decides the size of the crop. 



Average Manure Production. 



The average production of manure 

 per animal per year is approximately 

 as follows: 



Horse 18.734 lbs. 



Ox 39.672 



Cow 22.244 



Heifer 13.224 



Hog 3.306 



Sheep 1.102 to 2.204 



Quantity of Manure Per Acre. 



Medium well rotted as light dress- 

 ing, 7 tons per acre; medium dress- 

 ing, 10 tons per acre; heavy dressing, 

 14 tons per acre; very heavy, 17 tons 

 per acre. 



Old well rotted manure is richer 

 than fresh manure, is more active in 

 action and it must not be used in the 

 same quantity as fresh manure. On 

 heavy soil the manure furrow should 

 not be very deep. 



Fig. B. Steep Mouldboard Plow 



On light soil the air penetrates 

 deeply and thus the manure may be 

 put deeper. 



Composition of Barnyard Manure. 



Nitrogen Phosp. Acid Potash 



Horse . 11.6 lbs 2.44 lbs. 8. 8 lbs. 



Cattle . 6.8 " 1.39 " 6.64 " 



Sheep . 16.6 " 2.00 " 11.12 " 



Hog . 9.0 " 1.66 " 9. 6 " 



Dimensions of Manure Pits. 



Cattle. Length. Breadth. 



10 32 19 



20 32 32 



30 59 32 



40 65 39 



50 82 39 



Manure pits should be shallow; its 



bottom but 2^ to IV2 f'eet below 

 ground. 



Mulches of Soil. 



The following table shows the relative effectiveness of soil mulches at 

 different depths and different numbers of cultivation: — 



Not cul- Once in 2 Once per Twice per 



Cultivated 1 inch deep. 

 Loss in tons per 100 days... 

 Loss in inches per 100 days. . 

 The % water saved 



Cultivated 2 inches deep. 

 Loss in tons per 100 days . . 

 Loss in inches per 100 days. . 

 % water saved 



Cultivated 3 inches deep. 

 Loss in tons per 100 days . . 

 Loss in inches per 100 days. . 

 % water saved 



