. Proceedings of the American Society of Agronomy . Dry Matter per Gram of Transpiration (Grams) Percent W. Percent W. Percent W. Average. .001136 .000825 .001123 .001028 .001015 .001040 .001133 .001062 .001283 .000924 .001190 .001132 .001278 .001233 .001295 .001268 .001318 .001135 .001157 .001203 .001085 .001108 .001193 .001128 .001560 .001034 .001318 .001304 .001377 .001183 .001201 .001253 .001155 .001261 .001202 .001206 .001412 .001313 .001273 .001332 .001485 .001344 .001308 .001379 .001782 .001543 .001617 .001647 .001064 .001075 .001089 .001076 .001084 .001102 .001087 .00109
. Proceedings of the American Society of Agronomy . Dry Matter per Gram of Transpiration (Grams) Percent W. Percent W. Percent W. Average. .001136 .000825 .001123 .001028 .001015 .001040 .001133 .001062 .001283 .000924 .001190 .001132 .001278 .001233 .001295 .001268 .001318 .001135 .001157 .001203 .001085 .001108 .001193 .001128 .001560 .001034 .001318 .001304 .001377 .001183 .001201 .001253 .001155 .001261 .001202 .001206 .001412 .001313 .001273 .001332 .001485 .001344 .001308 .001379 .001782 .001543 .001617 .001647 .001064 .001075 .001089 .001076 .001084 .001102 .001087 .001091 .001288 .001151 .001227 220 PROCEEDINGS OF THE AMERICAN SOCIETY OF AGRONOMY. It is quite evident from Table XIV, and also from Fig. 23, that bothfertilizers and soil moisture have influenced the relation between tran-spiration and the production of dry matter. As regards the fertilizers, 2 Jis000u> 00 oo O N § S S N S - ^ § S i i£ i2 ^ ^ o o o o «> 00 00 eo CO c a, a, P« ** 1 I 8 8 <i GramflT 17. & % Moisture. 001500-. 29 f> Moisture. jm i-liiiilllLi- 4 i Moisture. mluliiIlL .000850 .001750 ,001500 . Fig. 23.—Amount of dry matter produced per gram of transpiration undervarying conditions of soil moisture and fertilization (oats). the nitrogen has had the most marked effect. Where the soil receiveda heavy application of sodium nitrate and therefore contained a solu- morgan: availability of plant nutrients. 221 tion which was relatively high in nitrogen, there was a much greateramount of dry matter produced per gram of transpiration than wheresmaller amounts of nitrogen were present. In fact, this factor variedquite consistently with the amount of nitrogen present. If we con-sider the averages for the three series it will be seen that where evenminimum amounts of nitrogen were added, there occurred an increasein dry matter per unit of water transpired. Increasing the nitrogento 640 pounds nitrate per acre has increa
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