Elementary principles of agriculture : a text book for the common schools elementaryprinci02ferg Year: 1913 A. Showing the amounts of nitrogen, phosphoric acid, and potash removed from the farm when 1,000 pounds each of beef, m^illi, butter, and strawberries are sold. CORN WHEAT OATS A A â â I 1 fi ] I * o i - .:â ⢠2 ..sRv â 1 ftj <- 1 ,. .4. .S- { r < M , - I ? i <â '.-: J° . LJ £S- B. Showing the amounts of the three most important plant foods from the soil by growing 1,000 pounds each of corn, wheat, removed and oats. C. Showing the amounts of the three principal plant-foo
Elementary principles of agriculture : a text book for the common schools elementaryprinci02ferg Year: 1913 A. Showing the amounts of nitrogen, phosphoric acid, and potash removed from the farm when 1,000 pounds each of beef, m^illi, butter, and strawberries are sold. CORN WHEAT OATS A A â â I 1 fi ] I * o i - .:â ⢠2 ..sRv â 1 ftj <- 1 ,. .4. .S- { r < M , - I ? i <â '.-: J° . LJ £S- B. Showing the amounts of the three most important plant foods from the soil by growing 1,000 pounds each of corn, wheat, removed and oats. C. Showing the amounts of the three principal plant-foods removed from and returned to the soil by 1,000 pounds each of cotton lint, cotton seed, and alfalfa. COTTON LINT COTTON SEED t?J a -z 0 1- z \ Â¥ I I \. \ t \ ^⢠r :i < .â ^. -i: H 'â¢'â â '.' Q Fig. 45. Tables showing the amount of mineral food substances removed and returned to the soil by various crops. insoluble combinations that the plants could not absorb it. This would not be the general rule, however. Usu- ally, where the soil analysis shows a high per cent of an essential element, fertilizing with substances con- taining this element rarely gives returns above the cost of the fertilizer. The only safe rule by which to learn
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