Abstract
Root development is described by a simple algebraic model which gives the numbers and lengths of root members of different orders in terms of time and a few properties of each order of root member. The model is tested against experimental results for the early growth of the roots of temperate cereals in pots or in liquid culture. The model is then used to simulate root growth and to explain the observed behaviour of four growth measures (relative multiplication rate, relative extension rate, mean extension rate, average root length) used in the growth analysis of root systems. Three principles governing root development emerge from the model and the simulations.
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