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This article in AJ

  1. Vol. 61 No. 4, p. 567-568
     
    Received: Nov 30, 1968


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doi:10.2134/agronj1969.00021962006100040025x

Effects of Soil Temperature and Zinc Application on Yields and Micronutrient Content of Four Crop Species Grown Together in a Glasshouse1

  1. A. Wallace,
  2. E. M. Romney,
  3. V. Q. Hale and
  4. R. M. Hoover2

Abstract

Abstract

Four species of plants were grown together in Dinubasandy loam in pots which were placed in temperature controlled tanks to give root temperatures of 14, 20, and 26C. Sugar beets had been previously grown and the residues incorporated in the soil to help induce a low zinc status. Zinc labeled with Zn65 had been added to half of the pots. Vegetative yields of two crops, Zn65 contents, and micronutrient and phosphorus contents of the plants were tabulated. Yields generally increased wih soil temperature with or without zinc application. Cotton yields responded to zinc at the low soil temperature, bush bean yields at the high soil temperature, and corn responded at all three temperatures used. Zinc content tended to increase with soil temperature; the increase was significant in cotton without added zinc and in soybean either with or without added zinc. The zinc application generally resulted in a higher zinc content of plants; the two cases when this was not significantly so were at the high soil temperature. Zinc content and evidently zinc needs varied considerably. The specific activity of the zinc in the four species was remarkably uniform, but for three of them there was a tendency for a decrease at the highest soil temperature. Plant phosphorus tended to increase with soil temperature, and there was a slight interaction with zinc contents. There was some tendency for copper and manganese in plants to increase with zinc; iron did also but to a much lesser extent. Copper tended to increase with soil temperature but manganese tended to decrease at the high temperature. Boron varied for species only and aluminum decreased with increasing temperature.

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