Nutrio-physiological studies on the tomato plant

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Abstract
In the tomato plant nutrient absorption is continuous and the net assimilation rate is kept almost constant at 6–7 g.m-2.day-1 throughout growth. The biological and economic yields are equivalent to those of cereal crops. Except for a few leaves at the base, a tomato plant is composed of several units which consist of the stem and three leaves (the vegetative organs), and a truss (the reproductive organ). Vegetative and reproductive growth occur simultaneously. The reproductive growth does not compete with the vegetative growth for nutrient elements or photosynthates because the growth of fruits is achieved by using currently absorbed or produced substances. The photosynthetic potential of the leaves seems to exceed the requirement of growing organs, and the leaves generally continue to grow even when the fruits are developing rapidly.

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