!I4 



LiuK' Reqiiireiiiciits itf ('nlidn Solh 



reduction of acidity as indicated by the bicarbonate method. Some of 

 the data from such determinations are given in Table VI, and plotted 

 in Curve ."}. 



Tablk \'1. The Acidity of certain Soils oflrr Trail incut icilh Lime. 



a.S 0-30 



^ -1. 



Curve i. 



Unl 13 36 S4 Ti 



]i('i tent. Carbonate, applied as O.'side 



Tlie KeiUutiun of Acidity in Soils treated with Calcium Oxidi- uii<l stored 

 in a moist condition. 



The reduction in acidity with increasiuf; applications of lime is. in 

 the case of the Woburn soil, gradual and not strictly proportional to 

 the amounts applied, but this is not surprising in view of the fact that 

 the soil during the period of storage only contained initially about 18 

 per cent, water and that some of the lime applied could not be expected, 

 on account of the relatively large size of the particles, to come into 

 action with rapidity. As against this we have the case of the Craibstone 

 soil where the reduction in acidity is directly equivalent to the amount 

 of lime suppUed in the two lower dressings. Beyond this there occurs 

 a perceptible "lag" in the curve. 



The relation between soil acidity and responsiveness to the applica- 

 tion of calcium carbonate is well demonstrated by the increased rate of 



