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Fig. 2. Relationship between percentage grain yield increase in response to narrow rows and radiation interception (RI) increase in response to the same treatment for maize (circles), soybean (triangles), and sunflower (squares). Radiation interception increase was expressed as [(RI in narrow rows - RI in wide rows)/RI in wide rows] x 100. Average standard errors of all experiments were 1.9 and 3.4% for x and y variables, respectively. Radiation interception was measured at flowering in maize and sunflower and at R3 in soybean. Y = 0.17 + 0.52x; r2 = 0.62; p < 0.001.
