. Proceedings of the American Society of Agronomy . reased thelength of time from planting to heading practically three days. Itis also a very noticeable fact that where the complete fertilizer wasadded at either the first, second or third stage, an increase in soilmoisture produced very little efifect upon the number of days fromplanting to heading. When a fertilizer high in -nitrogen was added,the increased amount of moisture produced a decided increase in thenumber of days from planting to heading. A high nitrogen fertilizeradded at the first stage decreased the length of this period fiftee
. Proceedings of the American Society of Agronomy . reased thelength of time from planting to heading practically three days. Itis also a very noticeable fact that where the complete fertilizer wasadded at either the first, second or third stage, an increase in soilmoisture produced very little efifect upon the number of days fromplanting to heading. When a fertilizer high in -nitrogen was added,the increased amount of moisture produced a decided increase in thenumber of days from planting to heading. A high nitrogen fertilizeradded at the first stage decreased the length of this period fifteendays in the low moisture series and only three days in the high mois-ture series under that of no treatment. In general, the length of the period from planting to heading was* The date of heading refers to the time when six plants per pot were in head. 238 PROCEEDINGS OF THE AMERICAN SOCIETY OF AGRONOMY. shortest where the fertilizers were added at the first stage as com-pared with where the same fertiHzers were added at later stages. SeeFig. Fig. 27.—Number of days from planting to heading (wheat) under differentconditions of soil moisture and fertilization. When the plants were mature, measurements were taken to deter-mine the influence of the various treatments upon the average lengthof culms from surface of soil to the base of the spikes and also uponthe average length of spikes. MORGAN : AVAILABILITY OF PLANT NUTRIENTS. Table XXIX gives the data as regards the length of culms. SeeFig. 28. Increasing the moisture content of the soil from percent percent has increased the average length of culms from to inches. U t> a) bO Z ^ 2. fa ^• CO Is % MolBture -35
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