Nutrients uptake by maize roots: vertical distribution of uptake rates during the vegetation period

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Title:Nutrients uptake by maize roots: vertical distribution of uptake rates during the vegetation period
Creators:
Novák, Viliam; novak at uh dot savba dot sk; Institute of Hydrology, Slovak Academy of Sciences, Račianska 75, 831 02 Bratislava 3, Slovak Republic
Journal or Publication Title:
Journal of Hydrology and Hydromechanics, 51, 1, pp. 14-21
Uncontrolled Keywords:Plant Nutrients, Soil, Uptake Rate Function, Transpiration, Water and Solute Distribution

Abstract

This contribution presents a proposal of semiempirical method to estimate vertical profiles of nutrients uptake rate by plant roots, based on results of field measurements of soil – plant – atmosphere continuum (SPAC). The transport of chemicals in porous media can be described by convection-dispersion equation, containing sink term, characterising the solute (nutrients) uptake by roots. To determine this sink term was the aim of presented study. The data – necessary for determination of nutrients uptake rate profiles – during plants ontogenesis were acquired by measurement in the field site with maize canopy, near Trnava locality, South Slovakia. The proposed method of vertical profiles of nutrients uptake calculation is based on the estimated direct proportionality between nutrients uptake rate (nitrogen, phosphorus and potassium) and transpiration intensity during ten days time intervals. Shorter time interval is not recommended to be utilised, because estimation errors are comparable to the changes of estimated values of nutrients concentration in plants. A nutrient uptake rates profiles can be determined using the Eq. (9), knowing water uptake rate profiles and the ratio of transpiration flux and particular nutrient uptake rate. The nutrient uptake rate profile calculated by the proposed method can be incorporated into the convection-dispersion equation and is used to model nutrient transport in the soil, taking into account uptake of particular nutrients by plants, during the vegetation period. Comparison of nitrogen uptake rates estimated from field measurements and those, calculated by the presented method shows significant differences in some cases, but seems to be applicable for mathematical modelling of nutrients uptake by plants.

Official URL: http://147.213.145.2/vc/vc1.asp

Title:Nutrients uptake by maize roots: vertical distribution of uptake rates during the vegetation period
Translated title:Odber živín z pôdy koreňmi kukurice: Rozdelenie intenzít odberu vo vertikálnom smere počas vegetačného obdobia
Creators:
Novák, Viliam; novak at uh dot savba dot sk; Institute of Hydrology, Slovak Academy of Sciences, Račianska 75, 831 02 Bratislava 3, Slovak Republic
Uncontrolled Keywords:Plant Nutrients, Soil, Uptake Rate Function, Transpiration, Water and Solute Distribution
Subjects:T Technology > TA Engineering (General). Civil engineering (General)
Divisions:Mathematics, Physics and Earth Sciences > Institute of Hydrodynamics > Journal of Hydrology and Hydromechanics
Journal or Publication Title:Journal of Hydrology and Hydromechanics
Volume:51
Number:1
Page Range:pp. 14-21
ISSN:0042-790X
Publisher:Institute of Hydrology of the Slovak Academy of Sciences and the Institute of Hydrodynamics of the Academy of Sciences of the Czech Republic
Related URLs:
URLURL Type
http://avi.lib.cas.cz/node/55Publisher
ID Code:6120
Item Type:Article
Deposited On:24 Jun 2010 13:45
Last Modified:24 Jun 2010 11:45

Citation

Novák, Viliam (2003) Nutrients uptake by maize roots: vertical distribution of uptake rates during the vegetation period. Journal of Hydrology and Hydromechanics, 51 (1). pp. 14-21. ISSN 0042-790X

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