New York AGRICULTURAL EXPERIMENT STATION. 491 
could: be detected in the lettuce on these two soils was that the 
_ general appearance, firmness and texture were a little better where 
no commercial fertilizers were used. 
Soils 10 and 16 were alike except that 10 received commercial 
fertilizers while 16 did not. Practically no difference could be 
detected in the lettuce on these two soils. 
Soils 11 and 17 were alike except that 11 received commercial 
fertilizers while 17 did not. Practically no difference could be 
found in the earliness, weight or appearance of the lettuce on 
these two soils but the. tip-burn was a little less injurious on the 
soil which received the commercial fertilizers. Figure 17, Plate 
XLVI, shows an average specimen of lettuce on Soil 17. 
In the two crops of the previous season on soils which contained 
about one-sixth stable manure by weight (15.5 per cent) a slight 
increase in growth followed the use of nitrate of soda. See Table 
7, page 486. But with the crop which has just been under con- 
sideration, where the manure constituted one-third of the weight 
of the soil, practically no advantage resulted from the addition of 
the commercial fertilizers either to the ight sandy loam or to the 
heavy clay loam. | 
