Feb. II. 1918 Effect of Season and Crop Growth on Soil Extract 337 



FlO. 5.— Graphs of the nutrients extracted from soil 8 by varying the ratios of soil to water. Calculated to 



parts per million of dry soil. 



Pig. 6. — Graphs of the nutrients extracted from soil lo by varying the ratios of soil to water. Calculated 



to parts per million of dry soil. 



