202 Our Climate and our Wheat-Crops. 
Table IX. — Composition of the Drainage - water collected^ at 
(lifierent Peiuods of the Season, from Plots differeutly manured ; 
BiiOADBALK Field, Kothamsted ; ^Wheat every Year, com- 
mencing 1844. 
^Nitrogen as Nitrates and Nitrites, per 100,000 parts of Drainage- water. 
Abstract of Dr. Voelcker's, and Dr. Frankland's Eesults. 
Ainmouia-salts Autumn Sown, Nitrate Soda 
Spring SoWD. 
From'Autumn Sowing to 
Spring Sowing. 
From Spring Sowing to 
next Autumn Sowing. 
Plot 5. 
rixed mineral manure) 
alone / 
r 
(Mixed mineral manure, j 
and 200 lbs. ammonia- > 
salts = 41 lbs. nitrogen) 
{Mixed mineral manure,] 
and 400 lbs. ammonia- [ 
salts = 82 lbs. nitrogen] 
{Mixed mineral manure, 1 
and 600 lbs. ammonia-) 
salts = 123 lbs. nitrogenj 
{Mixed mineral manure, 
and 550 lbs. nitrate- 
soda = 82 lbs. nitrogen 
Number of Nitrogen 
i^umuer oi lOu.OOO 
Collections. I'^jraiuage. 
0-622 
1-242 
2-182 
2-737 
1-019 
NiimliPr of Nitroge n 
nitrates in the drainage, but to show how much greater is the 
loss during the winter than during the later periods of the season, 
when the manures are autumn sown. 
The results in the Table relate to a period when the ammonia- 
salts were applied to the plots in question in the autumn, and 
the nitrate of soda only in the spring. In the first division is 
given the average composition of all the drainage-waters col- 
lected between the date of sowing the ammonia-salts in the 
autumn and that of sowing the nitrate in the spring ; and in 
the second division the average of those collected after the 
sowing of the nitrate, and before the next autumn sowing. 
Looking to the first division, relating to the samples collected 
during the winter, after the autumn sowing of the ammonia-salts, 
and comparing the results of plot 5 with mineral manure without 
ammonia-salts, with those of plots 6, 7, and 8, which had the 
same mineral manures, but with more and more of ammonia- 
salts in addition, it is seen that there was, not only much more 
nitrogen as nitric acid in 100,000 parts of the drainage-waters 
