LIME 195 



tions and decide where in the rotation the lime should come and 

 why. 



Encourage the pupils to obtain the rotations used on their home 

 farms and discuss lime in relation to such rotations. It might also 

 be well to visit some good farmer and discuss with him the form of 

 lime he buys, how he applies it, what amounts he uses and where in 

 the rotation he adds it to the soil. The practical phases of the use 

 of lime are what the pupil should understand. 



Exercise VII. — Problems — Forms of lime to apply. 



In buying lime the form that will give the greatest amount of 

 calcium for the money is usually purchased unless the flocculating 

 effect of burnt lime is necessary. The relative value of the lime, the 

 cost per ton, the freight and the cost of application must be con- 

 sidered. For a rough calculation 50 pounds of burnt lime is con- 

 sidered equal to 75 pounds of hydrate and to 100 pounds of ground 

 limestone. 



Problem 1. — A farmer located on land already sufficiently fri- 

 able, wishes to apply one ton of burnt lime or its equivalent in other 

 forms. Burnt lime costs him $5.00 per ton f. o. b., hydrate lime 

 $4.00 and ground limestone $2.25 per ton. Freight is 25^ per ton, 

 as is also hauling and application together. Which form of lime 

 should the farmer buy ? 



Problem 2. — The next year the f. o. b. price of lime changed to 

 $4.90, $3.00 and $2.00 for the burnt lime, the hydrate and the 

 limestone, respectively. Considering freight and cost of haul and 

 application the same as before, what form should be purchased ? 



Problem 3. — This same farmer can purchase marl at $1.00 per 

 ton, but he must load it himself and haul it three miles over a dirt 

 road. It is impure, carrying only two-thirds the calcium that the 

 limestone has. From conditions in your locality how would you 

 consider the desirability of purchasing this form of lime as com- 

 pared with those forms mentioned in Problem 2 ? 



