H.KBP1NU MANUBE UNDER COVSB. 



59 



CHAPTER XV. 



KEEPING MANURE UNDER COVER 



Dr. Voekker, at the same time he made the experiments alluded 

 to in the preceding chapter, plaeed anollar heap of manure under 

 cover, in a shed. It was tlie same kind of manure, and was treated 

 precisely as tlie other— the only difference heiriirthat one heap was 

 exposed to the rain, and tiie other not. Tlie following tahle i^ivcs 

 the results <jf the weighings of the heap at ditferent times, and also 

 the percentage of loss : 



MANURE FERMENTED UNDER COVER IN SHED. 



TABLE SnoWINti THE ACTUAL WEIOIUNGS, AND TERCESTAGE OF LOSS IN WEIGHT, 



or EXPERIMENTAL HEAP (NO. II.) FRESH FARMYARD MANURE CNDEB 



8HED, AT DIFFERENT PERIODS OF THE YEAR. 



It will be seen that 100 tons of manure, kept in a heap under 

 cover for six months, would be reduced to 49.6-tO tons. Whereas, 

 •when the same manure was fermented for the same length of time 

 in the open air, the 100 tons was reduced to only 71.4-10 tons. 

 The difference is due ])rincipa]ly to the fact that the heap exposed 

 contained more water, derived from rain and snow, than the heap 

 kept under cover. This, of course, is what we should expect. 

 Let us look at the results of Dr. Vcelcker's analyses : 



