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Yield Responses to Narrow Rows Depend on Increased Radiation Interception

Fernando H. Andrade*,a, Pablo Calviñob, Alfredo Ciriloc and Pablo Barbieria

a Unidad Integrada INTA Balcarce-Facultad de Ciencias Agrarias UNMP, CC 276, 7620 Balcarce, Buenos Aires, Argentina
b Unidad Integrada INTA Balcarce-Facultad de Ciencias Agrarias UNMP and AACREA, CC 276, 7620 Balcarce, Buenos Aires, Argentina
c INTA Pergamino, CC 276, 7620 Balcarce, Buenos Aires, Argentina



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  		Fig. 1. Relationship between percentage grain yield increase in response to reduction in row spacing and radiation interception (RI) observed in wide rows for maize (circles), soybean (triangles), and sunflower (squares). Radiation interception was expressed as percentage of incident radiation and measured at flowering in maize and sunflower and at R3 in soybean. Average standard errors of all experiments were 1.4 and 3.4% for x and y variables, respectively. Y = 42.85 - 0.45x; r2 = 0.60; p < 0.001.

 


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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.

 




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