160 STORRS AGRICULTURAL EXPERIMENT STATION. 
In adding the fertilizers to the soil of the pots about eight 
inches of the soil was removed from the top of each pot and 
with this the fertilizers were thoroughly mixed. The soil con- 
taining the fertilizer was then replaced as before and lightly 
pressed. 
The quantities of fertilizer applied to the soils were calcu- 
lated to be proportional to those used in the plot experiments. 
Some of the pots received the mineral fertilizers only—phos- 
phoric acid 1 gram, potash 1.5 grams and lime (calcium oxid) 
2 grams in each pot; some pots received these mineral fertil- 
izers and a little more than 3 grams of nitrogen in each, called 
the one-third nitrogen ration; some received the mineral fer- 
tilizers and twice as much nitrogen as the preceding, called the 
two-thirds ration; and some received the full ration of nitrogen, 
about 9.5 grams, in addition to the minerals. ‘The nitrogen 
was in all cases supplied in nitrate of soda. 

Shelter and care of plants.—The building used for a plant 
shelter is a light frame structure, 20 x 25 feet in area, open to 
the ridge and provided with a large number of windows. On 
one side there is a small addition which serves as a storage 
room for soil and small tools and as a work room. ‘The floor is 
of earth, and is about on a level with the small yard on the 
west side of the building. Extending through the length of 
the building and about 30 feet into the yard are three tracks 
on which are placed small, low trucks with light board plat- 
forms, to carry the pots of soil in which the plants are grown. 
At the end of and at right angles to the main tracks there is a 
sunken track, with a low truck the top of which is level with 
the main tracks. This low truck is used in transferring the 
regular trucks with the growing plants from one track to 
another. By this means it is possible to make the average 
exposure to sunlight about the same for each lot of plants; 
whereas if the trucks remained on the same track all through’ 
the season some of the larger plants might intercept the sun- 
light from the smaller ones. 
During pleasant weather the plants were kept outside the 
building; but during stormy weather, and whenever the wind 
might be likely to break the plants, they were housed in the 
plant shelter. 
