. Proceedings of the American Society of Agronomy . Fig. 33.—Percent, of nitrogen in straw (wheat) when grown under varyingconditions of soil moisture and fertilization. has produced results which are not very consistent and no definiteconclusions can be drawn. There is a much greater root developmentin the low than in the high moisture soil, which of course would havebeen expected. (See Fig. 34.) 248 PROCEEDINGS OF THE AMERICAN SOCIETY OF Fig. 34.—Production, in grams, of air-dry roots from plants (wheat) grownunder different conditions of soil moisture and fertilization. SUMMARY.
. Proceedings of the American Society of Agronomy . Fig. 33.—Percent, of nitrogen in straw (wheat) when grown under varyingconditions of soil moisture and fertilization. has produced results which are not very consistent and no definiteconclusions can be drawn. There is a much greater root developmentin the low than in the high moisture soil, which of course would havebeen expected. (See Fig. 34.) 248 PROCEEDINGS OF THE AMERICAN SOCIETY OF Fig. 34.—Production, in grams, of air-dry roots from plants (wheat) grownunder different conditions of soil moisture and fertilization. SUMMARY. 1. Increasing the soil moisture increased the length of time fromplanting to heading two days in case of oats and three days in caseof wheat. 2. Increasing the soil moisture has decreased the stooling of theoats and increased the stooling of wheat. 3. Increasing the soil moisture has greatly increased the productionof dry matter. MORGAN : AVAILABILITY OF PLANT NUTRIENTS. 249 4. Increasing the soil moisture has greatly reduced the percentageincrease in yield due to fertilizers. 5. The percentage increase in yield due to potassic and phosphaticfertilizers has decreased more rapidly following an increase in soilmoisture than has that due to nitrogenous fertilizers. 6. An increase in soil moisture has greatly decreased the percentageof dry matter in plants. 7. The amount of dry matter produced per gram of transpirationis greater in a medium tha
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