No. 85.J 



121 



mer, may, under the same or equally favorable circumstances, be done 

 by another, a fact that should prevent many of the mistakes and 

 losses that arise from unskillful husbandry. 



To show the means of doing this, it may be necessary to present a 

 few calculations showing what is taken from the soil in weight during 

 a course of ordinary crops, and also what is returned to them in straw, 

 &c., as manure in the same time. Fortunately we have here the aid 

 of those patient and accurate experimentalists, some of the results of 

 whose labors may be found in the valuable translations made from 

 Burger and others, by Prof. E. G. Smith, with notes by the transla- 

 tor. In doing this, we select in the first place two estimates, show- 

 ing two courses of crops, in one of which the fallow is used ; the ma- 

 nure employed ; the amount of grain and straw, or the whole pro- 

 duct from the soil ; and the deficiency of manure to supply the de- 

 mand of the crops. 



In this case, or with this course, there is a great deficiency in the 

 manure returned, to the soil, and therefore under it a soil must grow 

 poorer. In the next course the substitution of clover for the fallow, 

 will produce a different result. 



Here the materials returned to the soil as manure, exceed the drain 

 upon it from the grain produced and sold, by 20 cwt., and consequent- 

 ly, such a soil is growing richer by substituting the clover crop for 

 the fallow. 



