374 



STATE HORTICULTURAL SOCIETY. 



It is plain now, that knowing the number of pounds of merchant- 

 able produce obtained from each acre of land, and also the number of 

 pounds of potash, phosphoric acid and nitrogen which each one hun- 

 dred pounds of such produce contain, we can readily calculate the total 

 weight of the three substances which exist in the product of an acre ; 

 and as this has been derived from the land itself, it is also the weight 

 of the plant-food which each acre loses by such crop. 



TABLE 4. — Weight in Pounds of Plant Food Removed frotn One Acre by these Crops. 



Wheat, kernels:] 



Potash 8. 55 pounds. 



Phosphoric acid... 14.10 " 

 Nitrogen 27.60 " 



50.25 

 Wheat, straw: 



Potash 31.62 



Phosphoric acid... 13.75 " 

 Nitrogen 28.05 



122.67 " 



WHOLE CROP : 



Potash 40.17 " 



Phosphoric acid... 26.85 ." 

 Nitrogen 55.65 " 



122.67 " 

 Oats, kernels: 



Potash 4.70 " 



Phosphoric acid... 7.30 " 

 Nitrogen 13.86 



20.24 

 Oats, straw: 



Potash 22.22 " 



Phosphoric acid. .. 6.50 " 

 Nitrogen 13.86 " 



41.58 " 

 WHOLE crop: 



Potash 26.92 " 



Phosphoric acid... 12.80 " 



Nitrogen 32.10 " 



71.82 " 

 Corn, kernels : 



Potash 19.49 " 



Phosphoric acid... 24.53 " 



Nitrogen 55.10 " 



99.12 " 

 Corn , cobs and husks : 



Potash 5 37 " 



Phosphoric acid... 0.34 "• 



Nitrogen 3.70 " 



9.41 



Corn, stover: 



Potash 36.30 pounds. 



Phosphoric acid... 0,90 " 

 Nitrogen... 24 90 " 



62.10 

 WHOLE crop: 



Potash 61.16 



Phosphoric acid... 25.77 

 Nitrogen 83.70 



170.63 

 Tiruothy: 



Potash 50.80 



Phosphoric acid... 30.40 

 Nitrogen 47.20 



128.40 

 Red clover : 



Potash 104.00 



Phosphoric acid... 28.00 

 Nitrogen 113.50 



I 245.50 



Alfalfa : 



Potash 84.40 



Phosphoric acid... 26 80 

 Nitrogen 98.80 



210.00 

 Potatoes : 



Potash 40.20 



Phosphoric acid... 13.20 

 Nitrogen 24.00 



77.40 

 Carrots : 



Potash 27.60 



Phosphoric acid... 9.60 

 Nitrogen 14.40 



51.60 

 Cabbage : 



Potash 84.24 



Phosphoric acid... 47.52 

 Nitrogen 64.80 











(( 

 (( 



196.56 " 



A comparison of the individual and total weights of the three sub- 

 stances removed from each acre of land brings out interesting facts. 

 Of the regular farm crops, red clover and alfalfa stand foremost in 



