New York Agricultural Experiment Station. 467 



manure. The percentage of manure in this test was kept the 

 same for all the soils as the following table shows : 



Table II. — Ingredients of Soils Used fob Lettuce Forcing. 



(crop rr.) 



Soil. 



4. (bulk) . 



4. (weight) 



5. (weight) 



6. (weight) 



The ingredients which were used for these soils differed slightly 

 from those which were used for Crop I. The manure was horse 

 manure with the long straw and the dry rough portions removed. 

 It had been turned several time and was partly rotted. The 

 sand was much like that used for Crop I, but the loam was com- 

 posed- of rotted sod from a medium clay loam 1 which had some- 

 what more sand and gravel than that which was used for the pre- 

 ceding crop and it also differed from it in that it was not piled in 

 alternate layers with manure. 



In order to insure for Soil 6 a superabundance of available nitro- 

 gen, phosphoric acid and potash, it was given a liberal application 

 of commercial fertilizers in addition to the manure. This made 

 it necessary to extend the same treatment to Soils 4 and 5. High- 

 grade sulphate of potash, 50 per cent actual potash, was applied to 

 each at the rate of 400 pounds per acre; and acid phosphate con- 

 taining about 15 per cent available phosphoric acid, at the rate 

 of 600 pounds per acre. Nitrate of soda containing 15.7 per 

 cent nitrogen, was applied to the growing crop at the rate of 

 133 1/3 pounds per acre in two applications. 



The 3 soils were arranged in 9 plats on the north and south 

 side benches of the lettuce-house as shown in the accompanying 



l The mechanical analysis of this soil is given on page 479, and the chem- 

 ical analysis on page 487. 



