. Proceedings of the American Society of Agronomy . eral fertilizers were added the moisture con-tent of the soil produced little effect upon the percent nitrogen incrop, but where nitrogenous fertilizers were added, an increase insoil moisture was accompanied by a decrease in the percent nitrogenin crop. Large amounts of phosphoric acid have tended to decrease the per-cent nitrogen in crop. Nitrogen, when added in large amounts,greatly increased the percent nitrogen in the crop grown upon thelow moisture series, but this rapidly decreased as the soil moisturewas increased. The effect of potas
. Proceedings of the American Society of Agronomy . eral fertilizers were added the moisture con-tent of the soil produced little effect upon the percent nitrogen incrop, but where nitrogenous fertilizers were added, an increase insoil moisture was accompanied by a decrease in the percent nitrogenin crop. Large amounts of phosphoric acid have tended to decrease the per-cent nitrogen in crop. Nitrogen, when added in large amounts,greatly increased the percent nitrogen in the crop grown upon thelow moisture series, but this rapidly decreased as the soil moisturewas increased. The effect of potash could not be so well studiedas it was added in only one quantity, and this rather small. How-ever, the tendency seems to have been for the potash to slightlyincrease the percent nitrogen in crop. MORGAN : AVAILABILITY OF PLANT NUTRIENTS. 227 The most interesting effect produced by the fertilizers is the verymarked influence which the 640 pounds (per acre) of nitrate of sodahas had upon the nitrogen content of plants where the soil moisture s s s. 29 $ Moisture % Moisture.
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