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Relation Between Nitrate Absorption and Water Transpiration by Corn¹

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.

¹ Contribution from the Dep. of Soil Science, North Carolina State Univ. Agr. Exp. Sta. Published with the approval of the Director as paper no. 4166 of the Journal series. Taken in part from the Ph.D. dissertation of the senior author. This work was supported in part by TVA and the US Atomic Energy Commission through contract agreement no. TV13434-A, project agreement no. NC1131.

² Former Graduate Assistant and Professor of Soil Science at North Carolina State Univ., Raleigh, respectively. Dr. Liao is National Research Council Fellow at Canada Center for Inland Water, Burlington, Ontario, Canada.

Received for publication September 13, 1973. Accepted for publication November 9, 1973.