88 The Sugar-Beet in America 
Principles of good rotations. 
No one rotation is good under all conditions; soil type, 
climate, markets, and many other factors must be con- 
sidered when planning a rotation. A number of cardinal 
principles, however, if kept in mind, will be of considerable 
assistance. 
It is first necessary to decide what crops can best be 
grown under the conditions and what area of each crop 
it is best to grow. The following principles should then 
be observed : (1) raise about the same acreage of each crop 
every year; (2) have at least one cash crop; (3) include 
a legume crop in the rotation; (4) alternate tilled and 
non-tilled crops; (5) alternate deep- and shallow-rooted 
crops; (6) alternate exhaustive and restorative crops; 
(7) include crops that together will make the best use of 
irrigation water, labor, and equipment; (8) a forage crop 
should be included ; (9) follow the best sequence of crops; 
and (10) add manure to the right crop in the rotation. 
It is not always possible to conform to all these rules, 
but they may serve as useful guides. 
Rotations with sugar-beets. 
The rotation that should be practiced varies with so 
many conditions that the naming of any particular one 
to include sugar-beets may be misleading. It must be 
remembered, therefore, that no rotation is best for all 
conditions. Some of the factors that influence the rota- 
tion are: (1) kind of soil, (2) the kind of crops that can 
be raised profitably in the region, (3) the proportion of 
the farm that is to be planted to beets, (4) the amount of 
fertilizer available, (5) the number of live-stock kept on 
