220 University of California Publications in Agricultural Sciences [Vol. 1 



plants in their search for food and moisture. The general 

 average of nitrogen in the soil is good in the upper three feet 

 where it is most needed. 



Salinas Valley. — The lower or northern part of the valley for 

 about fifty miles is from eight to twelve miles wide, but to the 

 southward the valley is very narrow. Two classes of soil are 

 represented in this series: a column of fifteen feet from the 

 sandy loam lands of the west side of the Salinas River at Fort 

 Romie near Soledad; a column of the black adobe lands around 

 King City, ^Monterey County, was kindly sent by Mr. R. L. 

 Adams, formerly of the Spreckels Beet Sugar Company. 



Table 24. — Humus in Soil Columns op Salinas Valley, 

 Monterey County 



Ft. Romie 



Humus- 

 Soil Nitrogen in 



Clay 6.83 , '^^ n 



Ft. Humus Humus Soil 



1 Sandy 1.08 6.76 .07 



2 Sandy 73 8.46 .06 



3 Sandy 50 7.30 .04 



4 Sand 33 12.77 .04 



5 Loam 78 5.76 .05 



6 Loam 1.02 4.96 .05 



7 Loam 62 4.53 .03 



8 Loam 70 5.43 .04 



9 Loam 77 5.32 .04 



10 Loam 77 5.45 .04 



11 Loam 44 5.00 .02 



12 Loam 46 4.79 .02 



13 Loam 36 6.94 .03 



14 Loam 34 7.35 .03 



15 Loam 41 6.83 .03 



Sum of per cents 



in 15 feet 9.31 



Average per foot .62 6.51 .04 



Upper 3 feet :* 

 Sum of per cents 2.31 



Average per foot .77 7.50 .06 



* Range of most annual plant roots. 



in 10 feet. 



5.12 

 .51 



2.70 

 .90 



3.98 .02 



3.34 .03 



