Use of Spanish Phosphorite as a Manure. 
Turnips — (continued) . 
331 
Produce per Acre. 
Roots. 
Tups, including all the 
parts above ground. 
Manured with 
Gain. 
Gain. 
Loss. 
Remarks. 
8. 
llontfS^ witli Sulpliiiric 
Acid, 11 cut. to the 
Acre. 
lbs. 
31,898 
lbs. 
17,600 
lbs. 
44,421 
lbs. 
13,830 
lbs. 
Souud and tolerably equal. 
9. 
Graham's Animal Com- 
post, 260 lbs. to the 
Acre. 
32,109 
17,811 
33,G03 
3,013 
•• 
Sound and tolerably equal. 
10. 
Sulphate of .Ammonia, 
1 cu t. to the Acre. 
32,670 
18,372 
46,464 
15,873 
Sound, but of unequal size. 
11, 
Bones finely powdered, 
12c\vt. ti) the Acre. 
12. 
Putter's Guano. 260 lbs. 
to the Acre. 
13. 
Stable Duns', 22 tons 
to the Acre. | 
36,18S 
21,887 
45,446 
14,855 
Sound and tolerably equal. 
Tubers ralhcr larger than 
those from Nos. 5 and 6. 
37,201 
39,476* 
22,903 
25,178 
42,564 
49,912 
11,973 
19,321 
Sound and tolerably equal. 
2 lbs. dried as above, 
weighed 955 gr. ; burnt, 
96*5. 
Sound, but unequal. 2 lbs. 
dried as above weighed 
1010 gr. : burnt, 102gr. 
* The average of 10 years' successive crops of turnips on the same plot of ground I find to have 
been about 1 6 tons to the acre. In my Memoir on the Rotation of Crops it is stated somewhat higher, 
owing to a mistake in the measurement of this plot, which I have discovered since the Paper went 
to press. 
Oxford, December 8, 1845. 
XXVI. — On the Spanish Phosphorite and other Manures. By 
Sir H. Verne Bart. 
To Mr. Pusey. 
My dear Pusey, — Dr. Daubeny requests that I will communi- 
cate to you the result of the second year of an experiment, which 
I have made by his direction, on a field of heavy sandy loam, 
resting on a clayey subsoil. 
During the spring of 1844 the field, which was wheat-stubble, 
was prepared for a green crop, and the portion set apart for the 
experiment, consisting of 20 poles in separate plots of a pole 
each, was manured and planted with mangold wurzel on May 
20th, in the manner described by the following plan : — 
VOL. VI, 2 A 
