54 
SIR J. B. LAWES AND PROFESSOR J. H. GILBERT ON THE 
No. 2.—A complete mineral manure, containing potassium sulphate and chloride, 
calcium sulphate, bicalcic-phosphate, and magnesium sulphate. 
No, 3.—The complete mineral manure, and nitrate of soda = 0’3 gTam nitrogen. 
No. 4.—The complete mineral manure, and calcium carbonate. 
No. 5,—The complete mineral manure, and caustic lime. 
No. 6.—The mineral manure, excluding the bicalcic-phosphate, with nitrate of soda 
= 0'3 gram nitrogen. 
No. 7.—The mineral manure, excluding tire potash, with nitrate of soda = O'3 gram 
nitrogen. 
No. 8.—Farm-yard manure, containing 0'4 gram of nitrogen. 
No. 9.—The same quantity of farm-yard manure, and calcium carbonate. 
No. 10.—The complete mineral manure, and dried blood = 0'4 gram nitrogen. 
No. 11.—The complete mineral manure, dried blood as in No. 10, and calcium 
carbonate. 
No, 12.—Farm-yard manure as No. 8, and mineral constituents sufficient to bring 
the mineral supply up to that of the complete mineral manure. 
On June 30, 1883, 6 germinated seeds of buckwheat were sown in each pot. There 
was great variation in the luxuriance of growth. On September 6, all the crops were 
cut at the level of the soil, leaving the roots in it. On September 15, after stirring 
the soils, each pot was re-sown with a mixture of rye-grass and hybrid trefoil. The 
rye-grass grew slowly through the winter, but the trefoil almost disapj)eared. In 
March, 1884, the herbage was cut, a little more rye-grass and trefoil was sown, and a 
second cutting was taken on June 18. On June 20 nitrate of soda = O'l gram 
nitrogen was supphed to Nos. 3, 6, and 7 ; and on August 21 the last cutting was 
taken. 
The soils of the duplicate pots were mixed, as also were the crops, and the nitrogen 
was determined in the soils and in the crops separately. The following Table 
summarises the results obtained :— 
Series 1.—Experiments with Sandy-clay Soil. 
Experi¬ 
ments. 
Manures. 
Nitrogen, 
Crops, 
dry. 
Nitrogen. 
Nitrogen, 
gain 01 - 
loss. 
In 
soil. 
In 
manure. 
Total. 
In 
soil. 
In 
crops. 
Total. 
gr- 
gi’- 
gr- 
gr- 
gr- 
gr- 
gr- 
gr- 
1 
Without manure. 
1'56 
1-56 
11-00 
1-685 
0-3658 
2-0508 
+ 0-4908 
2 
Complete mineral manure. 
1-56 
1-56 
13-45 
1-719 
0-3540 
2-0730 
-1- 0-5130 
3 
Mineral manure and nitrate .... 
1-50 
0-300 
1-86 
19-10 
1-895 
0-5163 
2-4113 
+ 0-5513 
4 
Mineral and calcium carbonate . . 
1-66 
, , 
1-56 
14-70 
1-829 
0-3390 
2-1680 
+ 0-6080 
5 
Mineral and caustic lime. 
1-56 
1-56 
13-80 
2-042 
0-3834 
2-4254 
-1- 0-8654 
6 
Mineral without phosphate, and nitrate 
1-56 
0-300 
1-86 
14-42 
1-599 
0-4886 
2-0876 
-t- 0-2276 
7 
Mineral without potash, and nitrate 
1-56 
0-300 
1-86 
8-80 
1-825 
0-3110 
2-1360 
0:2760 
8 
Fann-yard manure. 
1-56 
0-400 
1-96 
14-35 
1-752 
0-3754 
2-1274 
+ 0-1674 
9 
Do., and calcium carbonate 
1-66 
0-400 
1-96 
14-85 
1-857 
0-3679 
2-2249 
+ 0-2649 
10 
Mineral, and dried blood. 
1-56 
0-400 
1-96 
17-95 
1-759 
0-5664 
2-3154 
+ 0-3554 
11 
Mineral, dried blood, and calcium car- 
1-56 
0-400 
1-96 
12-80 
1-523 
0-4234 
1-9464 
- 0-0136 
bonate 
12 
Farm-yard manure and mineral . . . 
1-56 
0-400 
1-96 
15-65 
1-716 
0-3814 
2-0974 
+ 0-1374 
