287 



Grecu Food. 



lbs. 



r 



Mangel-wurzel, br white beet, (Beta cicla), produces upon a suitable soil, or a deep rich loam, on") 



an average, twenty-five tons of green food per acre, every pound weight of which contains 390 ( 06OOO 



Nutritive 

 Matter. 



lbs. 



grains of nutritive matter, and therefore per acre 





3120 



Carrots, (Baucus carota), produce upon a deep light loam, on an average, eleven tons, every7 



pound of which contains 750 grains of nutritive matter - - . . . ' .' j^^^'^^ 

 Potatoes, (Soianum tuberosum), produce upon a fresh loam of intermediate quality as to moisture^ 



and dryness, on an average, 15 tons per acre, affording of nutritive matter per pound, 1440 grains )^^^^ 

 The common field or white turnip, (Brassica rdpa, var.), affords from a sandy loam, upon an aveO 



rage per acre, 16 tons of green food, a pound of which contains 320 grains of nutritive matter 3 

 The Swedish turnip, or ruta baga, (Brassica rapa, var.), produces on a favourable soil, or a strong") 



loam, on an average, 13 tons per acre, a pound weight of which affords of nutritive matter 440 V 29120 



2640 



6912 



1638 



1830 



grams 





Cabbages, (Brassica oleracea, var.), which delight in a rich strong loam, afford of green food, on7 ^ 

 an average per acre, 25 tons, every pound of which contains 540 grains of nutritive matter i 



Kohl rabi, (Brassica oleracea, var.), the produce from a soil similar to that for cabbages, or Swe-") 



dish turnips, is on an average 14 tons per acre*, and affords of nutritive matter per pound, 420 > 31360 



4320 



grams 





1881 



I, 



If a plant, therefore, impoverishes the soil in proportion to the weight of vegetable substance 

 it produces on a given space of ground, the following will be the order In which the plants just 

 mentioned exhaust the land. 



Mangel-wurzel 

 Cabbages 

 White Turnip 

 Potatoes - 



Kohl- rabi 

 Swedish Turnip 

 Carrots 



25 

 25 



16 



jg ! The proportions which they bear to each other 



14 



13 

 11 



with respect to weight of produce. 



J 



Experience has long since proved, that Carrots exhaust the soil in a much greater degree 



White 



than any of these plants. But when we take the weight of nutritive matter which a plant 

 affords from a given space of ground, the results are very different, and will be found to agree 

 with daily experience in the garden and on the farm. 



Potatoes 



Cabbag 



res 



Mangel-wurzel 

 Carrots 

 Kohl-rabi 

 Swedish Turnip 

 Common Turnip 



63 ^ 



42 

 28 



24 > 



17 



16 



14 J 



The proportion in which they stand to each 

 other, with respect to the weight of nutri- 

 tive matter per acre, and in exhausting the 

 land. 



* The average of some of these crops may be thought too small perhaps, but from information with which I have been 

 favoured from extensive Cultivators, and careful comparisons of the produce, as stated in the Agricultural Surveys, and in Mr. 

 Young's Annals, I believe the above correct. 



