OCR Text |
Show Permit? In I'otatoM. Ilulletln 67 ot the Malno Experiment Station giving somo figures of the chemical contents ot a potato crop sajs: Assuming these figures to fairly represent potatoes as grown In Maine, -a crop ot 200 bushels, weighing six tons, would remove thlrty-soven pounds of nitrogen, sixteen pounds of phosphoric acid and fifty-eight pounds of potash. If the amounts and pto-portions pto-portions of fertilizing elements removed re-moved by a crop could be taken as a guldo In preparing a Held for that crop, tho problem of supplying tho proper amount and kind ot plant food to tbe soil would be much simplified. To manure a field for a crop ot potatoes, nitrogen, phosphoric acid and potash would have to be added In about (no proportlona given aboro and In sufficient suf-ficient quantity to supply tbe vines and tubers tho land waa expected to yield. A formula made up on this basis would bo very materially different differ-ent from any mixed fertilizer on the market and would contain tho fertilising fertilis-ing elements In about the following proportions: Nitrogen, 5 parts; phosphoric phos-phoric acid, 2 parts; and potash, S parts. |