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This article in SSSAJ

  1. Vol. 38 No. 3, p. 472-477
     
    Received: Sept 13, 1973
    Published: May, 1974


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doi:10.2136/sssaj1974.03615995003800030027x

Relation Between Nitrate Absorption and Water Transpiration by Corn1

  1. C. F.-H. Liao and
  2. W. V. Bartholomew2

Abstract

Abstract

The relationship between the absorption of NO3-N by young corn plants (Zea mays L.) and the quantity of water transpired was studied in solution and soil culture. Tracer N (15N) was employed to measure NO3 absorption. Gravimetric methods were used to monitor evapotranspiration. From solution culture, NO3 was absorbed at rates relatively greater than water. From soil culture, NO3 was absorbed at a relative rate close to that of water when the soil was not pretreated. However, when the soil material was wetted and leached of soluble N before planting corn, NO3 was absorbed at a relative rate 1.5 to 2.0 times that of water. In soil situations where water was not being absorbed by plants, NO3-N likewise was not absorbed. Mass flow and diffusion both were involved in NO3 transport to roots. Prior cultural conditions had a marked influence on active uptake of NO3 presumably through an influence on specific rates of N absorption.

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