1907.] PUBLIC DOCUMENT — No. 33. 191 



holds true not only in general truck farming, which is fol- 

 lowed to a large extent in these regions, but is especially 

 applicable to the cultivation of head lettuce under glass, in 

 which unique skill has been developed. 



It is not unusual for market gardeners to put 40 cords 

 of horse manure per acre on the land used for market-gar- 

 dening purjDoses, and to a soil devoted to greenhouse lettuce 

 even larger quantities of manure are applied. In general, 

 the best market-gardening soils are those which contain a 

 large amount of coarse material, which is well illustrated by 

 the Belmont, Newton, Concord and Bedford soils. (Cf. 

 Table I.) 



In a similar class may be included Worcester soil No. 10, 

 New Bedford, Swansea and Touisset. The Worcester soil 

 No. 10 is from a river valley, and is well adapted to the 

 growth of head lettuce. The Providence soil is quite similar 

 to those of Cape Cod, and is somewhat coarser than the 

 Arlington and Belmont types. When these coarser soils are 

 well supplied with organic matter they are suitable for lettuce. 

 The Worcester soils Nos. 13 and 20, together with the 

 Amherst, Huntington and Pittsfield soils, are not desirable 

 ones for head lettuce, since they are too compact. These soils, 

 however, have been used for lettuce, and for this reason are 

 included in this list. 



