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- W2133303886 abstract "SUMMARY Lettuce obeys the Shinozaki–Kira relationship in which the reciprocal of plant weight is linearly related to plant density. The intercept ( a ) represents the reciprocal of the weight of an isolated plant and the slope ( b ) represents the reciprocal of yield/unit area at high densities (the ‘ceiling yield’). This work examines the time course of ( a ) and ( b ) in an ‘ideal environment’ in which water and nutrients are non-limiting, and the light/temperature regime is constant. Two pot experiments are described: the first showed that the growth of isolated lettuces follows a logistic expression, which can therefore be substituted for a– 1 in the Shinozaki-Kira equation. It was then hypothesized that b– 1 , the ‘ceiling yield’ would be constant over time. This was confirmed by the second experiment, giving the equation w –1 t = w –1 0 e 1–kt × w –1 max × bd, in which w t is mean plant weight at time t, w 0 and w max are the initial and final weights of isolated plants, k is the early relative growth rate of such plants, b –1 is the constant ceiling yield, and d is the plant density. Two examples of the use of the equation are given: one shows how it predicts the interaction between seed size and plant density within a species (subterranean clover): the other illustrates how it can be used to explain why lettuce growth appears to be log-linear against time whereas cereal growth is more nearly just linear." @default.
- W2133303886 created "2016-06-24" @default.
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- W2133303886 date "1976-02-01" @default.
- W2133303886 modified "2023-10-01" @default.
- W2133303886 title "The relationship between crop yield (or mean plant weight) of lettuce and plant density, length of growing period, and initial plant weight" @default.
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- W2133303886 doi "https://doi.org/10.1017/s002185960006500x" @default.
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