286 FORAGE OROPS 
tein, of which more than 50 per cent was shown 
by analysis to exist in the form of amides, com- 
pounds less valuable than true albuminoids. 
It must be remembered, however, that man- 
gels possess a value in addition to the actual 
food constituents contained in them, due to suc- 
culence and physical character, which it is im- 
possible to measure in definite terms, particularly 
for winter feeding in connection with dry fod- 
ders. Under certain circumstances their produc- 
tion is desirable, even though the cost of dry 
matter exceeds that in corn or clover, mainly be- 
cause of their dietetic effect and of the greater 
digestibility of the dry matter. 
SUGAR - BEET 
Sugar-beets are often recommended in place 
of mangels, largely because they contain a 
much higher percentage of dry matter, consist- 
ing largely of sugar. Varieties highly recom- 
mended by seedsmen are Queen of Denmark, 
White Rose Top and White Green Top, although 
those ordinarily grown for sugar are quite as 
useful. The preparation of land and fertilization 
should be practically the same as for the man- 
gels. The seeding should be somewhat different, 
as at least twenty pounds of seed is required per 
acre. Cultivation and harvesting and _ storing 
