. Proceedings of the American Society of Agronomy . ys from Planting toHeading for the Different Moisture Contents. Days from Planting to Heading. Percent W. Percent W. Percent W. Average. 320 p* 80 K 160 N 320 P, 160 N 320 P, 80 K 160 N, 80 K 320 P, 80 K, 160 N II7-5 640 P, 80 K, 160 N 640 P, 80 K, 320 N II9-5 II9-5 320 P, 80 K, 320 N II4-5 II9-5 3
. Proceedings of the American Society of Agronomy . ys from Planting toHeading for the Different Moisture Contents. Days from Planting to Heading. Percent W. Percent W. Percent W. Average. 320 p* 80 K 160 N 320 P, 160 N 320 P, 80 K 160 N, 80 K 320 P, 80 K, 160 N II7-5 640 P, 80 K, 160 N 640 P, 80 K, 320 N II9-5 II9-5 320 P, 80 K, 320 N II4-5 II9-5 320 P, 80 K, 640 N 10 tons manure 124-5 20 tons manure *P = acid phosphate; K = muriate potash; N = nitrate of soda. 202 PROCEEDINGS OF THE AMERICAN SOCIETY OF AGRONOMY. The length of time required for the plants to reach the stage ofheading has been shortened of a day following an increase in soilmoisture from to percent, while an increase in moisture. Fig. 17.—Number of days from planting to heading, under the different con-ditions of soil moisture and fertilization (oats). from percent to percent has increased this period practicallytwo days over that of percent moisture and three days over that MORGAN : AVAILABILITY OF PLANT NUTRIENTS. 203 of percent moisture. The moisture content of the soil appar-ently has influenced the length of this stage of growth some, but notnearly so much as have the fertilizers. We find that the greatestaverage variation in the length of time required for the plants to reachthe heading stage following the changes in the moisture content of thesoil, is approximately three days, while the fertilizers have produceda change in this period of approximately fourteen days, varying froman average of where the maximum amounts of nitrogen wereadded to an average of days where no treatment was given. Itis quite evident that all o
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