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This article in CS

  1. Vol. 34 No. 4, p. 1039-1043
    Received: Mar 26, 1993

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Sowing Date and Maize Productivity: I. Crop Growth and Dry Matter Partitioning

  1. A. G. Cirilo and
  2. F. H. Andrade 
  1. Unidad Integrada INTA EEA Balcarce-Facultad de Ciencias Agrarias, Universidad Nacional de Mar del Plata. C.C. 276 (7620) Balcarce, Bs. As., Argentina



Changes in the environment that are associated with different sowing dates can be expected to alter maize (Zea mays L.) growth and development in temperate regions. The objective of this work was to study the effect of sowing date on growth and dry matter partitioning of maize crops grown without water and nutrients limitations. A commercial hybrid (DK636) was grown in the field at four sowing dates (mid-September through mid-December) for 3 yr. Delays in sowing date hastened development between seedling emergence and silking, decreasing cumulative incident radiation on the crop during the vegetative period. However, late sowings increased crop growth rate during the vegetative period because of high radiation use efficiency and higher percent radiation interception. Conversely, late sowings decreased crop growth rate during grain filling because of low radiation use efficiency and low incident radiation. Late sowings affected grain yield by decreasing kernel weight and kernel number per unit area. Moreover, maize subject to these treatments accumulated more dry matter before silking than from silking to physiological maturity, while the inverse was true for early sowings. Thus, delaying the sowing date strongly decreased dry matter partitioning to grain.

This work was supported by Institute Nacional de Tecnología Agropecuaria (INTA), Consejo Nacional de Investigaciones Cientificas y Ténicas (CONICET), DeKalb Argentina S.A., Fundación Antorchas, and Facultad Ciencias Agrarias-Univ. Nac. Mar del Plata.

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Copyright © 1994. Crop Science Society of America, Inc.Copyright © 1994 by the Crop Science Society of America, Inc.