Elementary agriculture of Tennessee, with practical artithmetic elementaryagricu02hatc Year: 1909 THE SOIL AND THE CROP 55 steamed or raw, and phosphate are commercial fer- tihzers which furnish this food to the plant. Phosphoric Acid.âThere are great deposits of phos- phate rock in middle Tennessee, and it has been largely mined for the manufacture of acid phosphate. ''*â -',-' ; , - ⢠' ^^;-^.^^\:##^*,i;a'':^^ ^';' .^.:^?^^ â -:V;::â ⢠- IRISH POTATOES. 3 bu. salable per acre. bu. culls per acre. No fertilizer. bu. salable per acre. bu. culls per acre. The same soil fer
Elementary agriculture of Tennessee, with practical artithmetic elementaryagricu02hatc Year: 1909 THE SOIL AND THE CROP 55 steamed or raw, and phosphate are commercial fer- tihzers which furnish this food to the plant. Phosphoric Acid.âThere are great deposits of phos- phate rock in middle Tennessee, and it has been largely mined for the manufacture of acid phosphate. ''*â -',-' ; , - ⢠' ^^;-^.^^\:##^*,i;a'':^^ ^';' .^.:^?^^ â -:V;::â ⢠- IRISH POTATOES. 3 bu. salable per acre. bu. culls per acre. No fertilizer. bu. salable per acre. bu. culls per acre. The same soil fertilized with 500 lbs. of complete fertilizer per acre. UNIVERSITY OF TENNESSEE. The rock is ground fine and is then treated with sul- phuric arid, which makes a soluble. As with nitrogen, phosphoric acid is largely used in the early stages of plant growth. Wheat takes up four-fifths of its phos- phoric acid in the first half of the growing period.
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