Abstract
According to the results of high-yielding crop trials, a root-shoot interaction model is proposed to explain the high productivity of high-yielding crops. In our experiments the highest biological yields obtained varied considerably between different crops (1.45 kg m-2 dry matter for rice, 2.39 for winter wheat, 2.57 for maize, 2.13 for potato, 2.17 for beet, and 2.93 for sunflower). These differences could not be explained on the basis of plant type. Since the photosynthetic rate (dry matter increase) and root activity (nutrient absorption) remained constant during maturation in the high-yielding varieties, it is suggested that in these varieties, root and shoot mutually interact so that a high photosynthetic rate secures high root activity by supplying a sufficient amount of photosynthates to the roots. High root activity then secures a high photosynthetic rate by supplying a sufficient amount of nutrients to shoots.
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