Relation Between Nitrate Absorption and Water Transpiration by Corn
1974
Liao, C. F.-H. | Bartholomew, W. V.
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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