62 



CROPS AS FEEDERS 



Plant-food Elements Removed by Harvested Crops 

 (Pounds per acre per year) 



Crops 



Yield 

 per acre 



Nitrogen 



(N) 



Phosphorus 

 (P) 



Potassium 

 (K) 



Calcium 



(Ca) 



Alfalfa hay 



5 tons 

 40 bu. 

 1 ton 



(238) 



35.3 



11.2 



23.6 

 7.1 

 1.6 



185.0 

 11.8 

 19.9 



185.0 



Barley, grain 



0.8 



Barley, straw 



4.6 



Barley, total crop 





46.5 



8.7 



31.7 



5.4 



Beet, sugar (roots) 



Blue grass (Kentucky) . . . 



Buckwheat, grain 



Buckwheat, straw 



15 tons 

 2 tons 

 30 bu. 

 ^ ton 



78.0 

 53.2 

 21.8 

 12.5 



10.5 

 9.4 

 5.5 

 0.85 



79.5 



70.0 



7.3 



14.1 



8.0 

 12.0 



0.3 

 10.3 



Buckwheat, total crop . 





34.3 



6.35 



21.4 



10.6 







Cabbage (heads) 



Clover hay, medium red . 



Clover hay, alsike 



Clover hay, Japan 



Corn, grain 



15 tons 



2 tons 



2 tons 



2 tons 



65 bu. 



1% tons 



900 lbs. 



105.0 



(82.0) 



(80.0) 



(77.6) 



59.0 



33.0 



3.0 



9.2 

 6.8 

 12.0 

 18.0 

 9.1 

 6.8 

 0.3 



72.0 

 54.0 

 57.5 

 68.8 

 12.0 

 40.0 

 4.0 



36.0 

 61.6 

 39.2 

 40.5 

 0.7 



Corn, stover* 



12.2 



Corn, cob 



0.1 







Corn, total crop 





95.0 



16.2 



56.0 



13.0 









Com (for silage) 



12 tons 



500 lbs. 



1000 lbs. 



81.6 



1.5 



31.5 



16.7 

 0.3 

 5.7 



87.5 

 2.5 

 9.5 



14.0 



Cotton, lint 



0.6 



Cotton, seed 



1.8 







Cotton, total crop 





33.0 



6.0 



12.0 



2.4 









Cowpeas hay 



2 tons 

 15 bu. 

 0.9 ton 



(124.0) 

 30.4 

 20.6 



16.4 

 5.5 

 1.5 



137.0 



6.6 



15.6 



36.0 



Flax, grain 



2.0 



Flax, straw 



9.3 







Flax, total crop 





51.0 



7.0 



22.2 



11.3 









Hemp (dry stalks) 



Millet hay (common) . . . . 

 Oats, grain 



3 tons 

 . 3 tons 

 50 bu. 

 l}4 tons 



20.0 

 80.0 

 31.7 

 14.5 



4.0 

 9.5 

 5.6 

 2.4 



44.0 



107.0 



7.4 



31.1 



30.0 



16.2 



1.1 



Oats, straw 



7.5 







Oats, total crop 





46.2 



8.0 



38.5 



8.6 









Onion (bulbs only) 



Peas, grain 



500 bu. 

 20 bu. 

 l}i tons 



60.0 

 44.0 

 30.0 



11.0 

 4.5 

 2.5 



52.0 

 10.1 

 26.4 



31.0 

 2.0 



Peas, straw 



42.3 



Peas, total crop 





(74.0) 



7.0 



36.5 



44.3 









* When corn is shocked in the field weathering causes a logs of elements, especially 

 potassium, from the stalk and leaves. 



