SOME "CONCRETE FACTS ON FERTILIZA- 

 TION" IN CALIFORNIA. 



Taken from "Data compiled by Nitrate Fertilizer Com- 

 pany, Inc., Los Angeles, California." 



Explanation of Chart No. 1, on Soils. 



This chart is presented to show the elements that 

 should be in the soil and their relation to one another. 

 It is contrasted with the average of a great number 

 of soil analyses taken in various agricultural centers 

 in California. The chart is not intended to show any 

 actual existing condition, but is merely a guide to 

 show in a general way what elements are sufficient 

 in the soil and what elements need to be applied to 

 the soil. The grower's individual soil analysis may 

 be profitably compared with this chart, which will 

 show in a fairly accurate measure any deficiencies 

 that may occur in a specific case. 



This chart shows the total elements in the soil — 

 not taking into consideration the availability — 

 hence the greatest value of this chart is to show the 

 relation of one element to another. The soil may 

 contain 3 per cent lime and the plant suffer from lack 

 of lime, due to the fact that the lime is in an unavail- 

 able form. 



It would be impracticable to determine the average 

 relation of available plant food to unavailable plant 

 food because of the extreme variances encountered. 

 However, in individual cases this may be determined 

 to a fair degree of accuracy by a study of the past 



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