Pedosphere 1(2): 97--108, 1991
ISSN 1002-0160/CN 32-1315/P
©1991 Soil Science Society of China
Published by Elsevier B.V. and Science Press
| Mechanistic Model for Predicting NO3-N Uptake by Plants and Its Verification |
| XUAN JIA-XIANG, ZHANG LI-GAN, ZHU WEI-MINLMCP |
| Institute of Soil Science, Academia Sinica, P.O. Box 821, Nanjing 210008 |
| ABSTRACT |
| Some mechanistic models have been proposed to predict the NO3- concentrations in the soil solution at root surface and the NO3-N uptake by plants, but all these relatively effective non-steady state models have not yet been verified by any soil culture experiment. In the present study, a mathematical model based on the nutrient transport to the roots, root length and root uptake kinetics as well as taking account of the inter-root competition was used for calculation, and soil culture experiments with rice, wheat and rape plants grown on alkali, neutral and acid soils in rhizoboxes with nylon screen as a isolator were carried out to evaluate the prediction ability of the model through comparing the measured NO3-concentrations at root surface and N uptake with the calculated values. Whether the inter-root competition for nutrients was accounted for in the model was of less importance to the calculated N uptake but could induce significant changes in the relative concentrations of NO3- at root surface. |
| Key Words: |
| Citation: Xuan, J. X., Zhang, L. G. and Zhu, W. M. 1991. Mechanistic Model for Predicting NO3-N Uptake by Plants and Its Verification. Pedosphere. 1(2): 97-108. |
| |
|
View Full Text
|
|
|
|
