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Broom's Barn growth model and yield variability

  • Autor/in: Qi, A., C. Kenter, C. Hoffmann, K. W. Jaggard
  • Jahr: 2003
  • Zeitschrift: In: Sugar beet growth and growth modelling
  • Verlag: Hrsg. IIRB: Advances in sugar beet research vol. 5
  • Seite/n: 107-124
  • Stichworte: Zuckerrübe, Ertrag, Ertragsbildung, Simulationsmodell, Wasser, Blattflächenindex,

Abstract

In the presence of adequate nutrients, the important environmental variables that determine sugar beet growth and yield are: temperature, radiation, rainfall, potential evapotranspiration and soil available water content (SAWC). It is important to understand the integrated effects of these variables on the production of crop dry matter and sugar yield, if reliable mathematical models are required to predict accurately sugar beet growth and yield between years and across regions. The Broom’s Barn sugar beet growth model is process-based and was developed from observations at Broom’s Barn taking into account the integrated effects of these variables, assuming that the crop has a plant population density of ³75,000, is adequately supplied with nutrients and is free from pests and diseases. The Broom’s Barn soil is generally sandy loam and has a SAWC of about 14% at field capacity.Sequential harvest data from commercial fields at different sites in the UK and Germany showed that simulations of total dry matter and sugar yields by the original model agreed well with field observations from soils that had SAWCs from 13 to 16% at field capacity. However, three of the original parameters in the model had to be adjusted to align the simulated total dry matter and sugar yields with field observations from soils which had SAWC ³18%. These adjustments were based on three hypotheses tested in parllel with the field observations.
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