FOOD FOR PLANTS 



161 



Table Showing the Number of Pounds of Nitrogen, Phos- 

 phoric Acid and Potash Withdrawn per Acre by an 

 Average Crop (For U. S. 1920 Fgures Supplied by 

 New Jersey State Agricultural Experiment Station, 

 March 14th and 15th, 1924). 



Table Showing the Number of Pounds of Nitrogen, Etc. — 

 Continued. 



Crop 



Cowpeas 



Flax Fiber 



Flax Seed 



Hay 



Hops 



Oats 



Onions 



Peanuts 



Potatoes 



Rice 



Rye 



Soy beans 



Sugar Beets 



*Sugar Cane (La.) . 

 Sweet Potatoes .... 



Tobacco 



Tomatoes 



Wheat 



*Sugar Cane, Hawaii 



Per Acre 

 Yield 

 (lbs.) 



552.0 

 1,736.0 



347.2 

 3,140.0 

 1,332.0 

 1,126.0 

 21,278.0 

 1,710.0 

 6,576.0 

 1,809.0 



767.2 



948.0 



17,000.0 



30,000.0 



5,694.0 



796.1 

 8,400.0 



840.0 



78,000.0 



Nitrogen, 

 (lbs.) 



17.1 

 14.6 

 15.1 

 62.0 

 22.6 

 22.5 

 58.9 

 61.6 

 23.0 

 19.9 

 13.0 

 50.2 

 34.0 

 60.0 

 14.2 

 31.8 

 16.8 

 16.8 



156.0 



Phosphoric 

 Acid 

 (lbs.) 



5.5 



3.5 



5.6 



16.0 



14.7 



9.0 



19.2 



12.0 



9.9 



3.6 



6.5 



17.1 



17.0 



30.0 



5.7 



4.0 



5.9 



7.1 



78.0 



Potash 

 (lbs.) 



6.6 

 17.4 



3.3 

 49.9 

 20.0 



6.8 

 46.8 



7.7 

 32.9 



1.8 



4.6 

 19.0 

 76.5 

 135.0 

 28.5 

 47.8 

 29.4 



4.2 



351.0 



The average relative percentages of Nitrogen, 

 phosphoric acid, and potash thus removed from the 

 soil by these crops is therefore as follows: 



