Page:Foods and their adulteration; origin, manufacture, and composition of food products; description of common adulterations, food standards, and national food laws and regulations (IA foodstheiradulte02wile).pdf/329

 Magnesia (MgO),                4.69 percent Iron oxid (Fe_{2}O_{3}),       1.18    " Phosphoric acid (P_{2}O_{5}),  17.33    " Sulfuric acid (SO_{3}),        6.49    " Silicic acid (SiO_{2}),         2.13    " Chlorin,                       3.11    "

This analysis was made upon the so-called pure ash, deprived of its unburned carbon, and freed of sand and carbon dioxid.

Effect of fertilization on the yield and starch content: Experience in Germany has shown not only that liberal fertilization with nitrogen is favorable to the production of a large crop of potatoes, but also that this is accomplished without decreasing the percentage of starch therein. The following table shows the increase in yield, percentage of starch, and amount of starch obtained by nitrogen fertilization, the results being expressed in hectares and kilograms:

++-                         |                   |          ++++++-                          |          |  Yield of  |  Yield of  |          |  Yield of  |  Yield of        | Starch. | tubers per | starch per | Starch. | tubers per | starch per |         |  hectare. | hectare. |         |  hectare. | hectare. ++++++-                         | Percent. | Kilograms. | Kilograms. | Percent. | Kilograms. | Kilograms. ++++++- Seed,                    |  18.01   |   20,900   |   3,780    |  18.17   |   24,870   |   4,507 Champion,                |  21.33   |   19,510   |   4,152    |  21.48   |   24,470   |   5,233 Imperator,               |  19.00   |   22,560   |   4,235    |  18.70   |   26,830   |   5,007 Magnum Bonum,            |  18.41   |   19,170   |   3,522    |  18.07   |   22,510   |   4,057 Aurelie,                 |  19.47   |   18,950   |   3,653    |  19.75   |   23,550   |   4,609 Reichskanzler,           |  22.78   |   14,300   |   3,236    |  22.61   |   17,250   |   3,875 Juno,                    |  19.33   |   17,590   |   3,422    |  19.92   |   20,900   |   4,199 Amaranth,                |  22.47   |   16,180   |   3,619    |  22.84   |   18,310   |   4,188 Charlotte,               |  19.42   |   17,041   |   3,305    |  19.67   |   20,774   |   4,081 Gelbfleischige Zwiebel,  |  19.97   |   19,888   |   3,946    |  19.91   |   21,772   |   4,323 Dabersche,               |  21.82   |   17,377   |   3,778    |  21.80   |   20,313   |   4,399 Weissfleischige Zwiebel, |  20.51   |   16,877   |   3,442    |  20.58   |   19,501   |   3,936 Schneerose,              |  18.84   |   19,653   |   3,724    |  18.66   |   22,343   |   4,186 Nassengrunder,           |  19.08   |   19,701   |   3,725    |  22.12   |   21,889   |   4,813 Gelbe Rose,              |  21.09   |   16,847   |   3,547    |  20.60   |   20,177   |   4,129 Hortensie,               |  17.72   |   22,416   |   3,907    |  17.45   |   26,381   |   4,532 Richter's Lange Weisse,  |  19.37   |   22,134   |   4,267    |  19.19   |   24,490   |   4,664 Rosalie                  |  18.27   |   19,866   |   3,557    |  18.25   |   22,186   |   4,003 Achilles,                |  21.02   |   18,886   |   3,962    |  20.93   |   20,913   |   4,376 Alcohol,                 |  16.47   |   16,270   |   2,673    |  16.31   |   20,339   |   3,327 ++++++- Average,                 |  19.77   |   18,806   |   3,673    |  19.85   |   21,998   |   4,332 ++++++-

It is evident from the data given in the table that the liberal application of nitrogenous fertilizers increases the yield per acre of tubers and of starch to a very marked extent, although the average percentage of starch present is increased very little. Converting the average data given in the foregoing table into their equivalents in pounds per acre, we have the following