Articles

DYNAMIC MODELLING OF WATER STRESS FOR LACTUCA SATIVA L. VAR. CAPITATA

Article number
1099_116
Pages
909 – 915
Language
English
Abstract
Changes in precipitation patterns and water availability are expected to continuously increase the importance of efficient and reliable irrigation management in intensive plant production.
Therefore, accurate prediction of plant growth for deficient soil moisture conditions is essential.
A dynamic model was developed in order to investigate the impact of different water regimes on the growth of lettuce.
For this Lactuca sativa L. var. capitata was grown in a semi-open greenhouse at two irrigation levels (30 and 80% of potential evapotranspiration) and growth parameters were derived by relating fresh matter to soil and climatic conditions.
The developed model is built modularly and growth under optimal conditions is simulated by a two-dimensional dynamic model based on soil temperature and global radiation.
Water deficiency – in turn affecting growth – is taken into account by subsequent computing of soil water status as influenced by growth and evapotranspiration.
In addition to the optimization of irrigation strategies the model is further designed to be employed in climatic impact projections.

Publication
Authors
C. Duncker, A. Fricke, T. Rath, H. Hoffmann
Keywords
growth model, drought stress, irrigation, evapotranspiration, lettuce
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