Abstract
Agronomic performance of 38 landraces of Syrian durum wheat, in two growing seasons, at four locations and at two levels of nutrient availability, was analyzed with a crop growth simulation model developed for bread spring wheat. The model was adapted for durum wheat and landrace characteris tics, and for improvement of crop performance under water shortage at the end of the growing season. The availability of moisture and nitrogen interacted. At very low rainfall, moisture availability was the growth limiting factor, whereas at higher levels of moisture availability, nitrogen recovery and total dry matter production increased, and nitrogen availability became an additional growth-limiting factor.Grain nitrogen concentration was related inversely to harvest index and grain yield. The lowest observed straw nitrogen concentration was 0.0019 kg kg−1.Responses to environmental differences among seasons and locations were reproduced fairly well, and grain yield was predicted well in most circumstances. Despite shortcomings, the model presented a comprehensible tool to increase insight into plant growth processes. A crop growth simulation model can be applied in the preliminary evaluation of plant genetic resources, aimed at acquiring broad knowledge over diverse environments.
Published Version
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