. The Bulletin of the North Carolina Department of Agriculture. Agriculture -- North Carolina. The Bulletin. 19 These results certainly indicate that phosphoric acid is first needed by this soil. Acid phosphate alone gave an increase of over 15 bushels per acre. ISTitrogen alone gave an increase of only bushels, but when applied in addition to phosphoric acid it gave an increase of 16 bushels, nearly one bushel more than did phosphoric acid over no fertilizer. Potash alone gave a smaller yield than no fertilizer, very little increase when applied in addition to nitrogen or phosphoric acid
. The Bulletin of the North Carolina Department of Agriculture. Agriculture -- North Carolina. The Bulletin. 19 These results certainly indicate that phosphoric acid is first needed by this soil. Acid phosphate alone gave an increase of over 15 bushels per acre. ISTitrogen alone gave an increase of only bushels, but when applied in addition to phosphoric acid it gave an increase of 16 bushels, nearly one bushel more than did phosphoric acid over no fertilizer. Potash alone gave a smaller yield than no fertilizer, very little increase when applied in addition to nitrogen or phosphoric acid separately, and a decrease in addition to these Plate 2.—Corn Crop on Plat 6, Blantyre Field, 1910. No Fei-tilizer applied. Yield Bushels. Lime gives very fair increases either alone or in addition to a complete fertilizer, the gain over no fertilizer being at the rate of bushels and in addition to all three elements at the rate of bushels, making an average increase of bushels per acre. This would indicate that lime could be applied at a profit to this soil. The average gain for each element, given in the lower section of the table, has been computed from the figures in the main table. For example, there are four plats, each one of which received exactly the same treatment as some other plat except that nitrogen was applied in addition. In each case the gain for nitrogen may be determined. Plat number 3 for instance, yielded at the rate of bushels per acre more than plat number 1; plat 7 yielded at the rate of 16 bushels. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original North Carolina. Dept. of Agriculture. Raleigh : State Board of Agriculture
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