Simulated and observed sugar beet and spring wheat yields and yield variability in a long-term field experiment
2001
Haberle, J. | Klir, J. (Vyzkumny Ustav Rostlinne Vyroby, Prague-Ruzyne (Czech Republic)) | Diepen van, C.A.
Potential and water-limited yields of sugar beet and spring wheat in the period 1964-1993 were simulated with the WOFOST 6.0 crop growth model. Three different available water contents in the upper 100 cm of the soil at emergence, 20, 15 and 10 cm were simulated. Outputs of the model were compared with observed yields from a long-term field trial. The experiment was conducted in one field so each of the experimental crops was grown every other year. There were four fertilizer treatments, nil, organic, inorganic and a combination of the last two. Our study aimed to estimate the difference between simulated yields only limited by climatic factors and observed yields in the intensive two-crop rotation and to estimate yield variability. For the 15 years when beet was grown, the mean potential, water-limited and actual yields were 15.2, 12.3 and 10.9 t/ha, resp. The equivalent figures for wheat were 8.3, 7.9 and 4.0 t/ha. The inter-season variability of simulated water-limited beet yields reached 20-38 % and 22-34 % in observed yields with higher values in nil treatment.
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