Keiztucky Agricultural Eacperimeizt Station 35
On the Fariston experiment field for this year, the un-
treated soil produced 6.3 bushels of corn and 1290 pounds of
soybean hay, while the soil treated with limestone and phos-
. phate produced 50.9 bushels of corn and 3650 pounds of soy-
, bean hay; wheat and clover were practically a failure o11 these
e fields because of the severe late freezes.
` The following are sonic of the outstanding results obtained
` on the Campbcllsville field:
l Corn, bu. \Vheat, bu. Clover, lbs.
No treatment ...,.......................r 22.1 2.6 696
G Rock phosphate ........................ 28.9 5-9 3552
ll Some striking results have been obtained in a rot·ation of
Y tobacco, wheat and clover at Greenville aud Mayfield, as in-
3 dicated in the following table:
E Greenville Mayneld
No Limestone No treat- Limestone
N 2 treat- acid treat- acid
W ment phosphate ment phosphate
re Tobacco, 1bs' ..............,.. 424 1003 565 901
\Vl1eat, bus. .................. 6.7 20.4 S.4 23.4
Clover hay, lbs ............. 727 3560 1220 4159
>S· Laboratory and Greenhouse Work on Soils. Work begun
, last year on a study of the behavior of limestone and acid
L A phosphate and rock phosphate in relation to soil reaction was
Z continued this year. A wide variation has been observed on
the various soil experiment fields in the way crops respond to A
Z these two forms of phosphate on unlinied and limed ground.
Generally, on unlimed ground, roek phosphate has been as
I effective as acid phosphate, or more effective, while on limed
gpg ground, very wide variations have been found in their relative
effectiveness. For example, on the Mayfield and Lone Oak
fields, rock phosphate is as effective as acid phosphate; on the
lbs. Russellville and Greenville fields, it gives good results, but not;
as good as acid phosphate; on the Fariston field. it gives as
good or better results on unlimed ground than acid phosphate,
but used with limestone the results are not as good as when