Productivity of High-Yielding Crops : IV. Parameters Determining Differences of Productivity among Field Crops

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The biological yield (Y_b, glucose basis) of crops can be expressed by the following formula: Y_b=E_u×E_a, and Y_b=NAR×LAD, where E_u is the solar radiation use efficiency; E_a is the amount of solar radiation received by the plant canopy; NAR is the average net assimilation rate; and LAD is the leaf area duration. The results of parameter analysis obtained under various growing conditions were as follows. 1) When the Y_b values of all the crops were pooled together, the Y_b was closely related to the E_u and LAD parameters, but not to the E_a or NAR ones. 2) In rice and soybean, the Y_b was low due to the low values of E_u, E_a, and LAD. In winter wheat and maize, the Y_b was high due to the high value of E_u and LAD. In potato and sugar beet, the Y_b was high due to the intermediate or high values of E_u, E_a, NAR, and LAD in comparison with other crops.
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