354: ARTIFICIAL MANURES. 



108 Ibs. to each square rod, and about 3 Ibs. to each square 

 yard. 



Five loads will give 63 Ibs. to each square rod. 



To find the number of loads of manure required to the 

 acre, foi* a given number of Ibs. per square foot. 



KULE. Multiply 43560 (the number of square feet in an 

 acre) by the number of Ibs. you wish to spread on each 

 square foot, and divide the product by 2016, and the quo- 

 tient will be the number of loads required. 



EXAMPLE. Required, the number of loads of manure to 

 cover a 2-acre field, giving 2 Ibs. of manure to each square 

 foot? 



SOLUTION. 43560 x 2 x 2 = 174240 -=-20 16 = 86.4 loads. 

 Ans. 



ARTIFICIAL MANURES. 



It is a self-evident truth that if we sell, we must buy, or 

 we must be content to see our stock on hand reduced. 



This principle applies nowhere else with more force than 

 to the stock of mineral plant-food in the soil. This is, after 

 all, our " stock in trade " ammonia, carbonic acid, and wa- 

 ter ; the sources of nearly ninety-nine-hundredths of our 

 crops we can draw from the floating capital of the world, 

 and, except in the case of ammonia, we need give ourselves 

 but little trouble about them. With the mineral matters, 

 however, the case is very different. Some of them, it is true, 



