354 
The Woburn Field Experiments , 1908. 
about have covered the cost of the application. Magnesia is not 
yet a commercial article for agricultural purposes, and so it is 
difficult to say what it would cost if regularly available. The 
results obtained, however, with magnesia, are such as make the 
following up of this subject in the future very desirable. 
Experiment on Swedes [Butt Close), 1908. 
An experiment was designed with the double object of 
seeing which of three different varieties would do the best, and 
also of ascertaining the value for the swede crop of a manurial 
material recommended for use on land deficient in lime, and 
called “basic turnip manure.” The nitrogenous ingre- 
dients in the manure are derived from “ nitrolim ” (calcium 
cyanamide). 
The three varieties of swedes tried were “ Elephant,” 
“ Kangaroo,” and “ Invicta.” The same standard dressing was 
given to all three plots, and consisted of, per acre : farmyard 
manure, 12 tons ; superphosphate, 3 cwt. ; sulphate of potash, 
13 lb. (this supplying the same amount of potash as was con- 
tained in 6 cwt. of the basic turnip manure). Plot 1 was treated 
with the “ standard ” dressing only, plot 2 with nitrate of soda in 
addition (70 lb. per acre), giving the same nitrogen as in fi cwt. 
of the “basic turnip manure,” and plot 3 with the “standard” 
dressing and 6 cwt. per acre of the “ basic turnip manure.” 
The latter, it may be said, was basic in character, because of 
lime added to it, fitting it thereby for land poor in lime. 
The farmyard manure was spread June 10-12, 1908, and 
ploughed in June 15-23. The swede seed was then drilled ; 
the roots came up well, and were singled and hoed July 14-26. 
The crop was pulled and weighed December 5-18. It was 
noticeable that the “ Invicta ” came up out of the ground very 
“clean,” whereas the “Elephant” left much more earth 
attaching to the bulbs. The “ Kangaroo ” were a nice crop, but 
not equal to the “ Invicta.” The results are given in Table XIV. 
Table XIV. — Experiment on Swedes (Butt Close), 1908. 
Produce of Roots per acre. 
Variety 
Series 1 
Series 2 
Standard dressing 
only ^ 
Standard dressing 
with nitrate of 
soda 70 lb. per acre 
T. c. q. lb. 
T. c. q. lb. 
“ Elephant ” 
17 10 2 14 
16 19 1 14 
“ Kangaroo ” 
20 6 3 14 
18 6 3 14 
“Invicta’’. 
21 9 1 14 
19 6 1 0 
Series 3 
Standard dressing 
with basic turnip 
manure 6 cwt. 
per acre 
c. q. lb. 
8 1 21 
T. 
18 
20 2 0 21 
21 4 2 21 
i Farmyard manure 12 tons, superphosphate 3 cwt., sulphate of potash 13 lb. 
per acre. 
