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This article in CS

  1. Vol. 18 No. 5, p. 887-889
     
    Received: Apr 16, 1978
    Published: Sept, 1978


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doi:10.2135/cropsci1978.0011183X001800050054x

Gaseous Nitrogen Loss and Transpiration of Several Crop and Weed Species1

  1. C. A. Stutte and
  2. R. T. Weiland2

Abstract

Abstract

Evaluations were made of the amounts of water soluble, non-elemental N that is lost, along with transpiration water vapors, from plant foliage. A pyro-chemiluminescent analysis of transpirational vapors, condensed in a closed system containing an attached leaf, had revealed that plants do give off non-elemental N with transpira. tional water. In this study N loss, as well as transpiration rates, was ascertained for several crop and weed species: corn (Zea mays L.), cotton (Gossypium hirsutum L.), sorghum [Sorghum bicolor (L.) Moench], soybeans [Glycine max (L.) Merr.], common cocklebur (Xanthium pensyl-vanicum Wallr.), entireleaf morningglory (Ipomoea heder-acea var. integriuscula Gray), ivyleaf morningglory [1. hederacea (L.) Jacq.], jimsonweed (Datura stramonium L.), johnsongrass [Sorghum halepense (L.) Pers.], and palmer amaranth [Amaranthus palmeri (S.) Wats.]. Transpiration and N loss both were measured at 35 C and 2 days later at 28 C in field-grown plants. With the exception of johnsongrass, all species exhibited significantly higher rates of N loss at 35 than at 28 C. However, only cocklebur and palmer amaranth had significantly higher transpiration rates at the higher temperature. In this evaluation the weed species lost geater quantities of N and water than did the crop plants.

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