Geological Surveys of Kentucky and Arkansas. 247 
table shows us that an average crop of oats requires more of 
every mineral ingredient than is needful for a corresponding 
wheat crop. _ 
Tn fact, wheat is the crop, to grow which continuously requires, 
according to universal agricultural experience, land richer than 
that needed for any other of the seven crops whose chemical 
Statistics are given in Dr. Anderson’s Table, and notwithstanding, 
with exception of barley and the potato-tuber, it removes the 
least from the soil. 
The farmer knows that wheat delights in a deep, rather heavy 
soil, one which holds moisture well, and yet is not wet. Barley 
and oats flourish on soils that are too dry and light, and grass 
on those which are too wet for wheat. 
occurred in actual practice. We have a soil which as the result 
of long cultivation or from natural deficiencies, is incapable of 
Peiding a remunerative crop of wheat. Its texture is good, it 
as produced wheat abundantly, and needs nothing but a little 
of the right kind of manure to restore its power of giving a 
Stop. € put upon it Peruvian guano at the rate of 300 lbs. 
per acre, and the harvest is a good one. The entire addition to 
the soil is but 300 ths = one hundredth per cent. The 
= by his analysis between ; ath a soil which is unproductive 
rom the temporary exhaustion of some é 
dients; 2d, the ne soil which is rendered fertile again for a 
year by the use of 800 Ibs. of guano; an 
over-rich so that nothing will grew on it, by an app 
ais age f the 2d Ky. Rep., Dr. Owen remarks as follows: 
e . Rep., Dr. : , 
% les Tait pdb a aoe was collected in Bullit county, from 
an old field which had been fifty or sixty years 1 cultivation, 
and which will now no longer produce clover. I men e 
predict that when the analysis of this soil shall be complete 4 
Will be found to be deficient in some of these constituents, he : 
the mg er will probably show Ape a green crop mig 
Succeed better for the renovation of such land. | : 
On page 280 of the 8d Ky. Rep., Dr. Peter gives the 3 
of this soil, and says, “ The inability of this soil to produce clov 
* The mineral ingredients of plants. 
ication of a 
