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This article in SSSAJ

  1. Vol. 52 No. 3, p. 776-780
     
    Received: Jan 8, 1988
    Published: May, 1988


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doi:10.2136/sssaj1988.03615995005200030032x

Predicting Soil Temperatures to Indicate Winter Wheat Mortality

  1. J. K. Larsen ,
  2. L. J. Brun,
  3. J. W. Enz and
  4. D. J. Cox
  1. Dep. of Soil Science
    Dep. of Agronomy, North Dakota State Univ., Fargo, ND 58105

Abstract

Abstract

Tillage effects on soil temperature that affect winter wheat survival (Triticum aestivum L.) were investigated from 1981 to 1985 at Fargo, ND. Tillage systems used all 4 yr were reduced (disked) and no-till tall stubble (seeding directly into 20-cm standing stubble). Conventional tillage (plow, disk, and harrow) in 1981–82 and 1982–83, and no-till short stubble (seeding directly into 5-cm stubble) in 1983–84 and 1984–85 comprised the third tillage system used for comparisons. Survival of winter wheat in the no-till tall stubble system was near 100% in each of the 4 yr, while in 2 of the 4 yr, survival was 50% or less in the other tillage systems. Differences in survival were attributed to warmer soil temperatures in the tall stubble system. Hourly soil and air temperature measurements and snow depth were used to develop a statistical model that predicts daily minimum crown depth (3 cm) soil temperatures (R2 = 0.92). An independent set of data was used to test the model; soil temperatures within the range considered critical for winter wheat were predicted to an accuracy of 1 °C. Predicted crown depth soil temperature may be used to indicate winter wheat mortality.

Published with the approval of the Director of the North Dakota Agric. Exp. Stn. as Journal no. 1610.

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