. Proceedings of the American Society of Agronomy . Fig. 20.—Increase, in grams of dry matter, due to fertilizer treatments, underdifferent conditions of soil moisture (oats). from to percent. It will be also seen that the increase inmoisture from low to medium produced a greater increase in yieldfollowing the application of nitrogenous fertilizers than mineral fer- 2 lO PROCEEDINGS OF THE AMERICAN SOCIETY OF AGRONOMY. tilizers, while the greater yield occurred following the application ofmineral fertilizers when the moisture was increased from medium tolarge amounts. This is shown i
. Proceedings of the American Society of Agronomy . Fig. 20.—Increase, in grams of dry matter, due to fertilizer treatments, underdifferent conditions of soil moisture (oats). from to percent. It will be also seen that the increase inmoisture from low to medium produced a greater increase in yieldfollowing the application of nitrogenous fertilizers than mineral fer- 2 lO PROCEEDINGS OF THE AMERICAN SOCIETY OF AGRONOMY. tilizers, while the greater yield occurred following the application ofmineral fertilizers when the moisture was increased from medium tolarge amounts. This is shown in Table VI. It is also quite evident that the fertilizers have produced a relativelygreater increased yield in the low than in the high soil moisture. Thisis shown in Table .VII and in Fig. 20. All fertilizers, both mineral and nitrogenous, have greatly decreasedin their relative efficiency following an increase in soil moisture. Thedecrease is quite consistent. In the percent moisture soil theaverage increase in dry matter over that of no
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