XIV 
Journal of Agricultural Research 
Vol. VIII 
Effect of Irrigation Water and Manure on the Nitrates and Total 
Soluble Salts of the Soil 
Page 
Fig. i. Graph showing the total soluble salts and nitrates in soil held in the 
laboratory, with different quantities of moisture, for 2% years. 336 
2 . Graph showing the total soluble salts and nitrates in cropped and fallow 
soil maintained at various moisture contents in large tanks. 337 
3. Graph showing the total soluble salts, nitrates, and crop yields in tanks 
containing soil with varying moisture contents during different stages 
in the growth of the crop. 338 
4. Arrangement and treatment of plots in field experiment. 339 
5. Graph showing the soil moisture'and nitrates on August 7, 1911, to a 
depth of 3 feet in cropped soil to which different quantities of water 
and manure had been added. 340 
6. Graph showing the soil moisture and nitrates on August 7, 1911, to a 
depth of 3 feet in fallow soil to which different quantities of water 
and manure had been applied. 341 
7. Graph showing the soil moisture and nitrates on July 21, 1913, to a 
depth of 10 feet in cropped soil to which different quantities of water 
and manure had been added. 342 
8. Graph showing the soil moisture and nitrates on July 21, 1913, to a 
depth of 10 feet in fallow soil to which different quantities of water 
and manure had been added... 343 
9. Graph showing the total soluble salts in the fall in cropped soil receiving 
different quantities of manure and irrigation water. 344 
10. Graph showing the total soluble salts in the fall in fallow soil receiving 
different quantities of manure and irrigation water. 346 
11. Graph showing the nitrates in the fall in cropped soil receiving different 
quantities of manure and irrigation water. 347 
12. Graph showing the nitrates in the fall in fallow soil receiving different 
quantities of manure and irrigation water. 350 
13. Graph showing effect of irrigation water on nitrates, total soluble salts, 
and percentage of moisture in cropped soil at the close of the cropping 
season. 352 
14. Graph showing effect of irrigation water on nitrates, total soluble salts, 
and percentage of moisture in fallow soil in the fall. 353 
15. Graph showing effect of manure on nitrates, total soluble salts, and per¬ 
centage of moisture cropped and fallow soil at the close of the crop¬ 
ping season. 353 
16. Graph showing nitrates, total soluble salts, and moisture at different 
depths in a cropped soil at the close of the cropping season. 354 
17. Graph showing nitrates, total soluble salts, and moisture at different 
depths in a fallow soil in the fall. 354 
18. Graph showing the total yield of corn stover and grain produced with 
different irrigation and manuring treatments. 357 
The Relative Influence of Microorganisms and Plant Enzyms on the 
Fermentation of Corn Silage 
Fig. 1. Curve showing the disappearance of sugars in series 1. 367 
2. Curve showing the development of acidity in series 1. 368 
3. Curve showing the increase in amino nitrogen (and the rate of hydroly¬ 
sis of protein) in series 1. 369 
4. Curves showing the formation of alcohol in series 1 and 2. 370 
5. Curves showing the development of acidity in series 2. 371 
