. Proceedings of the American Society of Agronomy . d. See also Fig. 25. Table XXI.—Showing Influence of Soil Moisture and Fertilisers UponGrams Total Nitrogen in Crop. Treatment. Percent W. Percent W. Percent W. Average. No treatment .0697 .1411 .1663 •1257 320 P .0875 .1411 .1797 .1361 80 K .0754 .1502 .1952 .1403 160 N .1251 .1893 .2171 .1772 320 P, 160 N •1370 •1959 .2175 .1835 320 P, 80 K .0902 .1402 .1604 •1303 160 N, 80 K .1440 .1719 .1987 .17IS 320 P, 80 K, 160 N .1290 .1550 .1967 .1602 640 P, 80 K, 160 N •1339 .1828 .2170 .1779 640 P, 80 K, 320 N .2109 .1901 .1934 .1981
. Proceedings of the American Society of Agronomy . d. See also Fig. 25. Table XXI.—Showing Influence of Soil Moisture and Fertilisers UponGrams Total Nitrogen in Crop. Treatment. Percent W. Percent W. Percent W. Average. No treatment .0697 .1411 .1663 •1257 320 P .0875 .1411 .1797 .1361 80 K .0754 .1502 .1952 .1403 160 N .1251 .1893 .2171 .1772 320 P, 160 N •1370 •1959 .2175 .1835 320 P, 80 K .0902 .1402 .1604 •1303 160 N, 80 K .1440 .1719 .1987 .17IS 320 P, 80 K, 160 N .1290 .1550 .1967 .1602 640 P, 80 K, 160 N •1339 .1828 .2170 .1779 640 P, 80 K, 320 N .2109 .1901 .1934 .1981 320 P, 80 K, 320 N .1944 .2820 .1984 .2249 320 P, 80 K, 640 N .3606 .3474 .3555 •3545 10 tons manure .0788 .1594 .1965 .1449 20 tons measure .0921 ,1412 .2094 .1476 Average •1377 .2049 .2072 MORGAN : AVAILABILITY OF PLANT NUTRIENTS. 229 The amount, in grams, of total nitrogen produced, increased as themoisture content of the soil increased. This was quite marked fol-lowing an increase in moisture from percent to Fig. 25.—Production, in grams, of total nitrogen in crop (oats) under varyingconditions of soil moisture and fertilization. Beyond this point there was, in general, a very slight increase. Itwill be remembered that the yield of dry substance also increased 2^0 PROCEEDINGS OF THE AMERICAN SOCIETY OF AGRONOMY. following a rise in soil moisture, particularly from low to mediummoisture, and this largely accounts for the increased production ofnitrogen. However, one or two very interesting exceptions nitrate of soda was added at the rate of 640 pounds per acre,there was produced, in the crop from the low moisture soil, a totalweight of nitrogen greater than that produced in the crops fromeither the medium or high moisture soils. This is the more interest-ing when we notice that the production of dry matter was very muchless upon the dry than upon the medium or high moisture soils,amounting to a difference of almost 70 percen
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