GRIMSLEY. | Gypsum as a Fertilizer. We 
potash. These experiments, carried on for two years on the 
same land, are given in the following table :” 
Analysis of Clover. 
1s4l, 1842, 
Land Land 
. No ; No 
arth, | aypeam. | sith | eypeum 
NSE SeETee rom COov noe anne n es aes 270.0 113.0 280.0 97 .0 
SIE ic a NLR UN in ra Sn 28.1 DONT 10.4 12.7 
Oxides (iron, manganese, and alumina).. ho U 1.4 ? 0.6 
J Dita 5: a i pm arate ce a a 79.4 a2m2 102.8 32.2 
JM Lesa aVEISN aj eh ae ne Me ee Aa ee ee aa 18.1 8.6 28 .5 Tol 
VE LOWEST 01 RR tery ten 0 V0 Ns CI IL gan ae a 95.6 AD U Sie, 28.6 
SS OGLE Pee Ur My ae re OM NC Arun AMO DR SEN Wo Nt Cai 2.4 1.4 0.8 DS 
upon Ge raei lism ey Men iy Mai ee eee oF2 4.4 9.0 3.0 
OS hOri CraCi Gurren Pore yaa 24 2 11.0 227.9 7.0 
@hilonnera cee wero ne Nar TO AC, 10.83 4.6 8.4 3.0 
This table gives the number of kilogrammes of the elements 
in clover from a hectare of ground, and it certainly shows that 
gypsum has had considerable effect on the clover. The great 
increase of potash shown by these analyses will be referred to 
again in connection with theories explaining action of gypsum 
on soils. 
Wilson’s Experiments. 
In Wilson’s Rural Encyclopedia, published in 1850, there 
is asummary of knowledge concerning the value of gypsum as 
LenilIiZereblenciteswanvexperment) by a) Mi Smith am 797, 
where six bushels of plaster to the acre were used in May on 
very pale, almost lifeless, white clover, and in two weeks, 
though there had been no rain, the clover was vigorously grow- 
ing. 
In another case given, part of a field was covered with gyp- 
sum and yielded 2226 pounds of herb and 316 pounds of seed. 
An equal sized tract without gypsum yielded only 839 pounds 
herb and 56 pounds of seed. According to one series of experi- 
ments a ton of hay additional to the acre was produced by use 
of gypsum. 
47. Storer, Agricultural Chemistry, Vol. I, pp. 206-216, 1887. 
