138 MANURE. 



Or, per year : 



4800 lbs. of geine, «* 



71 " of bone-dust, 

 37 " of plaster, 



37 " of limestone, marble, or chalk, 

 25 *' of common salt, 

 15 " of sulphate of potash. 



This is the product of one cow. A^ord of green cow- 

 dung, pure as dropped, would be formed, daily, by 108 cows. 

 A cord of dung weighs 9289 lbs., which, -i- 86 lbs. (or 1 

 cow,) = 108 cows. And one cow daily produces, in excre- 

 ments, salts of lime sufficient for 4| bushels of corn. 



190. Multiply the quantity produced by one cow, by the 

 number of cows kept, and it may easily be calculated how 

 much salts and geine are annually applied to soil in this 

 form. This is better done than the estimate by cords or 

 loads. The manure from one cow is a definite comprehen- 

 sible quantity. 



191. Estimating the nitrogen as ammonia, the yearly 

 product of one cow is 156 lbs. of nitrogen, equal to 189 lbs. 

 of pure ammonia, or equal to 677 lbs. of bi-carbonate of 

 ammonia of the shops. A single cow will therefore give, 

 annually, fed on hay and potatoes, 31,025 lbs. of dung, con- 

 taining 



4800 lbs. of geme, 



