· — . flif 
I Soil Fertility. 49 _ I
potash is used. in addition to phosphate and nitrogen, giving · `  
_ the potash full opportunity to show its eHects. _  
c°· Dr. Hopkins, in the National Stockman and Farmer of l l ei`,e J
m' April 3, 1915, shows that in the Pennsylvania experiments  
LOG from 1885 to 1908, one dollar invested in potash paid back 9 . V  
he I cents, while phosphate paid $3.44 per $1.00. In this case also  
be potash was applied in addition to phosphate and nitrogen.  
In commenting on the soil requirements for corn, Prof. lll
DO i Williams of the Ohio Experiment Station says on page 76 ‘ lll
’ . V Y y .:1-Ll
‘ Of Bul. 282: y  
i "Proper soil conditions for the corn crop will then include thorough , A  
idly under-drainage, either natural or artificial; a crop rotation which will 2;,-
1  · adequately maintain the organic matter of the soil through the use of  
Lb e .
good sods of clover and grasses, and such catch-crops as may be adapted  
* to the varying conditions, in addition to all the manure available; liberal ».;_
1915  . applications of phosphorus to supplement the manure and natural de- `Ijl
 _ flciencies of the soil, as well as to restore the phosphorus sold from the  
Oll€ · farm in cereals and livestock; and lime as may be needed to correct soil ' ' ,g
ite, · acidity and furnish a satisfactory environment for bacterial life. In the »i__-l
. absence of manure some soils will need applications _of nitrogen and po- ???}l
vlth tassium before good crop yields can be secured."  
vith i {ij
On page 73 he further says: . ly?}
lSh’ "Manifestly something is needed on the land besides phosphorus.  
_ With the addition of either nitrogen or potassium to the above amount lL{5i_]
may of phosphorus the yield of corn is increased to a little over 43 bushels _  ij}
‘ per acre, and by the addition of both, to 47 bushels, though the profit A  zfi;%‘·l
D9? over cost of fertilizer is but a little greater than from phosphorus alone, ,E¢:·"
4 owing to the high cost of commercial nitrogen and potassium. Cheaper  
46• · l  ·
1,ng . Soufglesfof these elements are found in the stable manure. Larger gg} ~
1 . yie s o corn have been secured with the use of manure, and substan-  
‘cI.€_ tially as, good returns from phosphorus, when used in addition to  
manure. . -).·
hels Z . ` . .  
 ‘ In the report on the Piedmont soils of North Carolina,  
391+  . Professor Williams of the North Carolina Experiment Station  
page says on page 99, after summing up results of experiments:  
_ · "Of all the types of soils of the Piedmont Plateau Region of the · QP 
_ GX _ State thus far studied, the content of potash present in the surface soil  J 
>]..44 ls generally sufficient for growing maximum crops for a hundred years -  
paid OF more. It is generally more a problem of making this supply availa-  
ble than of increasing it. Not only do the chemical analyses show that  {
the there is a fairly liberal supply of potash in these soils, but in no case do  U s
mage I , W9 find any marked increases in yield due to its use, and frequent_ly the   ’
, _ yield 1S actually reduced. Generally it certainly would give better lmme-  
§V1ll€ diate returns and would be far more beneficial to eliminate potash alto-  
d {tg g€th€1` for general farm crops, and put the money into an additional  
. Supply of phosphoric acid, Potash, however, can be applied with profit pig
Bd ln _ tO_;0l?§iCC0 and very probably to Irish potatoes on most of the Piedmont ,