280 FORAGE CROPS 
tions of varieties: ‘Among the mangels, all of the 
long varieties seem to be able to produce good 
yields but have various defects. The Globe and 
Tankard varieties usually contain a higher per- 
centage of water and are low in dry matter 
content. Two half-sugar mangels, Vilmorin Half- 
sugar Rosy and Carter Half-sugar, are recom- 
mended as suitable stock to use for breeding 
American strains. Sugar-beets, although rich in 
dry matter, are generally so much more expensive 
to harvest that the writers are not prepared to 
advocate their extensive use for stock-feeding.” 
Land, manures and fertilizers 
In the culture of this crop, particular pains 
should be taken to provide a deep surface soil, 
as the deeper the soil the greater will be the 
proportion of root grown under the ground. Be- 
sides, the crop requires a large area of soil, in 
order to supply the rather exorbitant demands 
for plant-food. When the best yields are ob- 
tained, it is frequently recommended to subsoil 
at least eighteen inches, in order that the fine 
rootlets may penetrate to lower depths. In order 
to ensure a large yield, the crop should be well 
supplied with all the constituents of plant-food 
in available forms. When the land is heavy, it 
should preferably be plowed deep in the fall, and 
