FIELD TEST OF A MODIFIED NUMERICAL MODEL FOR WATER UPTAKE BY ROOT SYSTEMS.

R. A. Feddes, E. Bresler, Shlomo P Neuman

Research output: Contribution to journalArticle

253 Citations (Scopus)

Abstract

Data obtained from careful water balance studies on water uptake by the roots of red cabbage are compared with results obtained from a modified numerical model of M. N. Nimah and R. J. Hanks. In the modified model the air dry moisture content at the soil surface may vary with time depending on meteorological conditions. The maximum possible rate of evapotranspiration is calculated by considering both meteorological conditions and crop properties. Data are quoted to suggest that the coefficient of the root sink may sometimes vary exponentially with depth. A period of 7 weeks was simulated, and the calculated weekly moisture profiles did not agree completely with those measured in the field. On the other hand, the calculated cumulative rates of evaporation and transpiration were in excellent agreement with the field data. When the original model was used without the suggested modifications, the agreement of these rates with the field data was not as good, an indication that some of these modifications actually improve the predictive capabilities of the model.

Original languageEnglish (US)
Pages (from-to)1199-1206
Number of pages8
JournalWater Resources Research
Volume10
Issue number6
StatePublished - Dec 1974
Externally publishedYes

Fingerprint

water uptake
root system
root systems
Numerical models
Water
Moisture
Transpiration
Evapotranspiration
testing
evaporation rate
Crops
balance studies
Evaporation
cabbage
water balance
transpiration
evapotranspiration
Soils
water budget
moisture content

ASJC Scopus subject areas

  • Aquatic Science
  • Environmental Science(all)
  • Environmental Chemistry
  • Water Science and Technology

Cite this

FIELD TEST OF A MODIFIED NUMERICAL MODEL FOR WATER UPTAKE BY ROOT SYSTEMS. / Feddes, R. A.; Bresler, E.; Neuman, Shlomo P.

In: Water Resources Research, Vol. 10, No. 6, 12.1974, p. 1199-1206.

Research output: Contribution to journalArticle

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