New Yoek 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 light sandy loam or to the 

 heavy clay loam. 



