134 
Chemical Report. 
Causes of the Benefits of Clover as a Preparatory Crop for 
VVhoat. 
With the sanction of the Chemical Committee, I set on foot, 
as in previous years, a number of fiehl-experiments on — 1. Root- 
crops — Mangolds, Swedes, Carrots. 2. On Potatoes. 3. On 
Artificial Grasses. 4. On Permanent Pasture. 
The following printed list was forwarded to a number of agri- 
culturists residing in different parts of the country, mostly former 
pupils of mine : — ■ 
EXPEKIMENTS. 
Field Experiments on Roots : Mangolds, Swedes, Turnips, and 
Carrots. — The following experiments are recommended with a 
view of ascertaining what is the best root-manure on different 
soils ; each plot to be one-twentieth of an acre : — 
I'lot. 
1. No uiauure. 
2. Mineral superplios^iliate .. .. IO2 lbs., or at tlie rate of 3 cwt. ]iei' acre, 
q (Mineral superjiliosphatc.. .. 16i lbs. „ 3 „ 
"'•(Potash salts 11 ' lbs. „ 2 
^ I Mineral superphosphate . . . . ] 6^ lbs. „ 3 „ 
'{Peruvian guano 5^ lbs. „ 1 „ 
5. Peruvian guano IQh lbs. „ 3 „ 
6. No manure. 
{Mineral superphosphate .. .. 16a lbs. „ 3 „ 
Potash salts 11 lbs. „ 2 
Sulphate ol' ammonia .. .. lbs. „ 1 
8. Rotten dung 1 ton „ 20 tons per acre. 
(Mineral superphosphate.. .. 16^ lbs. „ 3 cwt. jier acre. 
Potash 11 lbs. „ 2 
Nitrate of soda 5i lbs. „ 1 „ 
( Ttottcn dung ^ ton „ 10 tons per acre. 
"(Mineral superphosphate .. lbs. I3 cwt. per acre. 
(Bone dust IGHbs. ,, 3 „ 
■(Mineral superphosphate .. 81 lbs. „ 1+ „ 
12. No manure. 
Samples of the experimental fields were desired to be sent to 
Dr. Voelcker, 11, Salisbury-square, Fleet-street, London, E.C. 
Field Experiments on Potatoes. — The following exjieriments 
are specially recommended on light soils ; each plot to be one- 
twentieth of an acre : — 
Plot. 
1. No manure. 
! Mineral superphos])bate .. ., 22 lbs., or at the rate of 4 cwt. per acre. 
Crude potash salts 11 lbs. „ 2 „ 
Suli)hate of ammonia .. .. 11 lbs. ,, 2 „ 
3. Good rotten dung 1 ton „ 20 tons per acre. 
