Effect of Date of Seeding of Winter Wheat upon some Physiological Changes of the Plant during the Winter Season¹

Effect of Date of Seeding of Winter Wheat on Plant Development and its Relationship to Winterhardiness1

“…2 and 3) does not conform to the degree of root development, therefore, we must look for other causes. Some of these causes have been discussed in another paper (12). It has been observed repeatedly that plants from the late dates of seeding usually succumb to unfavorable weather and soil conditions.…”

“…I, or whether other conditions influenced the winterkilling. • It is pointed out in a previous paper (12) on the chemical composition of the plant that the quantity of reserve substances in the crown of the plant in the fall and the rate at which these substances are respired in the dormant season very likely bear an important relation to the survival of the plant over winter and its subsequent spring recovery.…”

“…Plants from four dates of seeding were collected from a field having 9% moisture in the upper 6 inches of the soil. These plants were analysed for pentosans, according to the method described in a previous article (12). The results are given in Table 7.…”

Changes in Certain Nitrogenous Constituents of Winter Wheat as Related to Cold Hardiness

“…The percentage of crude protein did not vary greatly with hardening. Janssen (7) found that water soluble nitrogen and soluble nitrogen coagulable by heat increased in wheat during the fall as temperatures decreased. No change in total nitrogen was noted.…”