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© 1990 Oxford University Press

RESEARCH-ARTICLE

A Dynamic Growth Model of Vegetative Soya Bean Plants: Model Structure and Behaviour under Varying Root Temperature and Nitrogen Concentration

JUNE TAEG LIM1, GAIL G. WILKERSON2,4, C. DAVID RAPER, JR3 and HARVEY J. GOLD1

1 Biomathematics Program, Department of Statistics Box 8203 North Carolina State University Raleigh, North Carolina 27695, USA
2 Department of Crop Science Box 7620 North Carolina State University Raleigh, North Carolina 27695, USA
3 Department of Soil Science Box 7619 North Carolina State University Raleigh, North Carolina 27695, USA

4 To whom correspondence should be addressed.

A differential equation model of vegetative growth of the soya bean plant (Glycine max (L.) Merrill cv. ‘Ransom’) was developed to account for plant growth in a phytotron system under variation of root temperature and nitrogen concentration in nutrient solution. The model was tested by comparing model outputs with data from four different experiments. Model predictions agreed fairly well with measured plant performance over a wide range of root temperatures and over a range of nitrogen concentrations in nutrient solution between 0.5 and 10.0 mmol in the phytotron environment. Sensitivity analyses revealed that the model was most sensitive to changes in parameters relating to carbohydrate concentration in the plant and nitrogen uptake rate.

Key words: Glycine max (L.) Merrill, dry matter, nitrogen uptake, partitioning, photosynthesis, respiration, sensitivity analysis


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