Mangel Experiments. 
307 
towards the close of June. In 1905, “Yellow Globe” mangel 
was grown, in 1906, “ Golden Tankard,” and the crops were 
ready for pulling about the middle of October. The results 
for the two years are given in Table XVI. 
Table XYI . — Mangel Experiments , 1905 {Road Piece Field), 
and 1906 •( Warren Field). 
Plot 
• 
Manures per acre 
Produce of roots per acre 
1905 
1906 
1 
Dung only ...... 
T. c. q. lb. 
20 19 0 0 
T. c. q. lb. 
26 9 2 21 
2 
Dnng with nitrate of soda, 1 cwt. . 
27 9 1 0 
28 7 2 7 
3 
Dung with nitrate of soda, 1 cwt. ; salt, 
1 cwt. ....... 
28 8 0 0 
28 12 2 14 
4 
Dung with nitrate of soda, 2 cwt. . 
24 3 3 0 
27 16 0 14 
The experiment of 1905 gave considerable gains from the 
use of top-dressings over dung alone, but also showed what 
seemed to be anomalous, viz., that 2 cwt. of nitrate of soda 
should give a less crop than 1 cwt. of nitrate of soda. For this 
reason the experiment was repeated in 1906, and, though lower 
gains were obtained from the top-dressings, the plots arranged 
themselves again in the same order as in 1905. That is to say, 
the best return was in each year obtained by using the mixture 
of 1 cwt. of nitrate of soda and 1 cwt. of salt, and the next 
best from using 1 cwt. of nitrate of soda alone, the doubling of 
the dressing of nitrate of soda not only producing no increase, 
but giving actually a smaller crop. 
Experiment on Late Pulling of Mangels 
( Warren Field), 1906. 
It has not infrequently been asserted that it is a mistake 
to keep mangels long in the ground, but that it is advisable to 
pull them fairly early, as any subsequent growth which they 
may make consists mainly of water. To put this to the test a 
portion of the mangel crop grown in Warren Field in 1906 (see 
last experiment) was taken up at the usual time, October 10, 
while another portion was left to grow on until the first frost 
made its appearance. This was on November 12, or, practically, 
a month later than the first portion. The mangel was “ Golden 
Tankard,” and the plots were not the top-dressed ones men- 
tioned in the last experiment, but others by the side of them, 
and manured per acre with dung (12 tons), superphosphate 
(3 cwt.), and sulphate of potash (1 cwt.). When the two lots were 
pulled the roots were weighed, portions carefully drawn and 
analysed. The results were : — 
