306 Wisconsin State Agricultural Society. 
in which red clover was the leading crop, and by that system they 
have made their light, sandy lands rich and wonderfully productive. 
It was a saying among them that no man was a farmer who did 
not grow clover. They proved that, under their system, lands need¬ 
ed no rest, but grew richer by cultivation. There can be no doubt 
but that rotation in crops is as necessary to profitable farming as is 
rotation in office to a healthy condition of the body politic. 
ROTATION OF PLANTS 
seems to be a law of nature. Where plants are removed from the 
soil, and the land left to nature, she supplies their place with plants 
of a different kind. When the same variety of grain or vegetable 
is grown year after year, on the same soil, without change of seed, 
there is always a tendency to deterioration, and this, where the land 
is generously manured, whereas, by procuring seed of the same 
variety from a distance the yield is increased, without adding any¬ 
thing to the soil; the increased yield being due solely to the change 
of seed. 
ROTATION OF MANURES. 
The marked effect of changing manures on gardens and highly- 
manured lands, has been noticed. By changing manure the crops 
were increased. The late Joseph B. Lyman, formerly agricul¬ 
tural editor of the New York Tribune, related an instance that 
came under his observation, where a garden had produced large 
crops of vegetables for several years, where manure from the horse- 
stable had been used. At last it failed to produce good crops, and 
even the weeds grew sick of it; but by substituting barn-yard 
manure, it returned to its former productiveness. In this instance 
there was little or no difference, chemically, in the manure; the in¬ 
creased yield was caused by the change of the kind of manure. 
Frequently lands that appear to be exhausted contain an abundance 
of plant-food, but in a condition where it will remain until a system 
of tillage is adopted by which the plant-food may be brought into 
a soluble condition, suited to the wants of the crop. 
SUMMER-FALLOWING 
is practiced to change the mechanical condition of the soil, making 
it fine and mellow, exposing its particles to light, heat, air, and rain; 
