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Shading effects on the yield of an Argentinian wheat cultivar

Published online by Cambridge University Press:  27 March 2009

R. Savin  and
G. A. Slafer
R. Savin
Affiliation:
Cátedra de Cerealicultura, Departamento de Productión Vegetal, Facultad de Agronomía, Universidad de Buenos Aires, Av. San Martin 4453, 1417 Buenos Aires, Argentina.
G. A. Slafer
Affiliation:
Cátedra de Cerealicultura, Departamento de Productión Vegetal, Facultad de Agronomía, Universidad de Buenos Aires, Av. San Martin 4453, 1417 Buenos Aires, Argentina.
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Summary

Shading treatments of 50% of the incident radiation were applied to the semidwarf wheat cultivar Leones INTA before and after anthesis in two field experiments in Argentina in 1987 and 1988. The treatments reduced biological (above-ground dry matter) yield, grain yield and number of grains/m2. Number of grains/m2 was closely and linearly correlated with ear dry weight at anthesis and with the photothermal quotient, calculated from 20 days before to 10 days after anthesis. Grain yield was sink limited, and the shading treatments reduced sink strength. The contribution of preanthesis assimilates to grain yield was smaller in the shaded crops than in the unshaded controls; in unshaded crops, almost 40% of grain yield was contributed by preanthesis assimilates whilst in preanthesis shaded crops this contribution was negligible. The proportion of preanthesis assimilates contributed to the grain was closely related to the decrease in stem dry weight during grain filling. The effects of shading on main stems and tillers were the same.

Type
Crops and Soils
Information
The Journal of Agricultural Science , Volume 116 , Issue 1 , February 1991 , pp. 1 - 7
Copyright
Copyright © Cambridge University Press 1991

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