MARYLAND GEOLOGICAL SURVEY 163 



manure are most beneficial to this soil when in a run-down condition, 

 but the effects from applications of green manure are decidedly more 

 beneficial in that they are more lasting than for equal amounts of Ijarn- 

 yard manure. Tlie benefits from liming are obvious, while potash and 

 nitrogen in combination witli manure are sufficiently beneficial to justify 

 their application, at least in amounts not to exceed 250 pounds per acre, 

 but the results do not seem to indicate that when applied 

 alone they are of enough effect to warrant their use. The 

 Leonardtown loam is capable, under proper tillage, of producing 

 wheat and grass to much better advantage than it does at present. But 

 the tobacco crop, unsuited to so heavy a soil, must be omitted from the 

 rotation; and lime, stable manure, and green manures employed. The 

 raising of stock, undertaken at first in a small wa}^ would make possible 

 this very necessary change of conditions while aiding materially in the 

 improvement of the soil. 



The Susquehanna gravels consist of such coarse material that they do 

 not maintain a suff^icient moisture supply for the maturing of crops 

 which require a long period of growth. The gravel areas are difficult to 

 improve and though adapted to the production of grapes, as is shown by 

 the experience of other localities, it is probable that an intelligent system 

 of forestation would bring better results in the long run than would 

 any other treatment of such areas. 



The Windsor sand soil type on account of its coarse texture maintains 

 but a small supply of water and while not fitted for the production of 

 large grain crops it is classified with those soils upon which may be 

 produced crops of early truck, whose special value depends upon early 

 maturity and a strong market. The type is widespread along the At- 

 lantic seaboard and its northernmost extension in the Connecticut Val- 

 ley furnishes an area suited to the production of wrapper-leaf tobaccos. 

 The climatic conditions of the two regions are somewhat different, 

 Carefully conducted experiments in the production of the higher grades 

 of wrapper tobacco should be undertaken on this soil. The peach crop 

 raised upon this soil at present is notable for the beauty and quality of 



