1919] Pendleton: A Study of Soil Types 461 



with a very hard surface on drying. This makes the soils hard to 

 handle in greenhouse pot culture work. 



The variation in crop growth from soil to soil, as shown by the 

 total dry matter produced (tables 79-84 and fig. 32), is rather 

 marked. That the several samples do not show equal crop producing 

 powers is very evident, though with regard to the several indicator 

 crops the soils would frequently not maintain the same order. Soil 

 no. 26 gave the poorest yields with all six crops. Except for wheat, 

 the soils nos. 10, 11, and 12 gave low yields with both the grains and 

 the legumes. It is interesting to note that wheat gave relatively high 

 yields with a number of the soils, and wheat has probably been raised 

 on these soils more than any other one crop. This series shows that, 

 as far as the samples represent the type and the crops used represent 

 crops as a whole, the soils mapped under a given type name are not 

 closely similar in crop producing power under greenhouse conditions. 



Table 79 — San Joaquin Sandy Loam 



Eye 



Planted, November 22, 1916. Harvested, June 21, 1917 



Notes 



Kained on 



Kained on 



