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Some Factors Influencing the Injury to Winter Wheat Heads by Low Temperatures 1
Author(s) -
Livingston J. E.,
Swinbank J. C.
Publication year - 1950
Publication title -
agronomy journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.752
H-Index - 131
eISSN - 1435-0645
pISSN - 0002-1962
DOI - 10.2134/agronj1950.00021962004200030006x
Subject(s) - agricultural experiment station , citation , library science , agriculture , winter wheat , operations research , agricultural economics , political science , agricultural science , agronomy , mathematics , computer science , environmental science , history , biology , archaeology , economics
N JURY to winter wheat heads in Nebraska by a late I spring frost in 1946 was reported by Livingston and Swinbank (l).3 This same type of injury occurred again in the spring of 1947, although the damage was less severe. In general, the fields managed in such a way that they headed early for the locality, or planted to an early maturing variety, were the fields most severely injured. T h e most damage occurred at the stage when the head emerges from the boot. The stage of development appeared to be more important in determining the amount of injury than the variety of grain. A question arises, therefore, as to whether 'or not the early maturing varieties such as Pawnee and Wichita might actually head too early for NFbraska conditions. Earliness is a desirable character from the standpoint of escaping damage from stem rust and hot weather. However, if Pawnee and other early varieties head while there is still danger from injury by late spring frosts, then it would seem that these and still earlier varieties would be subject to such frequent damage that they would be undesirable because they would be less dependable. In view of these considerations and in order to determine some of the factors affecting frost susceptibility, a series of experiments was planned to study the following factors in relation to frost injury of wheat heads: (1) stage of development; (2) relationship between temperature and length of exposure; (3) soil fertility; (4) free moisture on heads; (5) varietal tolerances to frost injury.