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



green-maniire crops grown, turned under deeply, and allowed to 

 humify properly would add much to the value and fertility of 

 these lands. 



Low Lands. — Near the border of Chino Creek there are low- 

 lying lands forming a wide border of "moist lands" which do 

 not need irrigation. Ten acres of this near Chino formerly 

 formed a part of the Experiment Station. A column from this 

 was taken by ilr. F. E. Johnson. Another column was taken 

 near Pomona from a marsh spot laiown as a "cienega." This 

 is a "limited area showing growth of water-loving plants, appear- 

 ing sporadically in otherwise arid surroundings — usually hill- 

 sides or valley margins — and occasionally giving rise to flowing 

 springs."— (Kept. Calif. Expt. Sta., 1892-4, p. 185.) 



Table 32. — Humus in Soil Columns of Lowlands, San Bernardino 



Valley 

 SAN BERNARDINO COUNTY 



Chino 



LOS ANGELES COUNTY 

 PoMoxA Cienega 



Range of most annual plant roots. 



In each of these lowland soils the humus content is excellent 

 though not especially rich in nitrogen. The large amount of the 

 former, however, makes up for any low percentage of nitrogen 



