SciELO - Scientific Electronic Library Online

 
vol.37 issue3Severity of alternaria in sunflower crop in the Cerrado region of Federal District, BrazilRelative contribution of yield components for grain production in soybean author indexsubject indexarticles search
Home Pagealphabetic serial listing  

Services on Demand

Journal

Article

Indicators

Related links

Share


Pesquisa Agropecuária Brasileira

Print version ISSN 0100-204XOn-line version ISSN 1678-3921

Abstract

SANGOI, Luís; LECH, Vanderlei Adilson; RAMPAZZO, Clair  and  GRACIETTI, Luís Carlos. Dry matter accumulation of maize hybrids under different source: sink ratios. Pesq. agropec. bras. [online]. 2002, vol.37, n.3, pp.259-267. ISSN 0100-204X.  http://dx.doi.org/10.1590/S0100-204X2002000300005.

Little attention has been given to the study of phenological and physiological differences among contrasting cycle maize hybrids during grain filling. This experiment was conducted in order to evaluate the effects of planting density and defoliation on dry matter accumulation after flowering of maize hybrids with different thermal requirements to reach tasseling. The trial was performed in Lages, SC, Brazil. Two hybrids were tested: P32R21, very early, and C333B, late, at four plant populations: 25,000, 50,000, 75,000 and 100,000 plants/ha. Dry matter accumulation was estimated at 0, 21, 42 and 64 days after anthesis. Plants were assessed with intact leaf area and having half of their green leaves removed at anthesis. The very early hybrid presented greater speed of grain dry matter accumulation and higher decrease of leaf dry matter 64 days after anthesis than the late hybrid. Hybrid C333B showed lower dry matter accumulation rates during the first three weeks after anthesis than at the end of the filling grain period. Increase in plant population and defoliation reduced grain dry matter accumulation rates of both hybrids.

Keywords : Zea mays; plant population; defoliation; seed filling.

        · abstract in Portuguese     · text in Portuguese     · Portuguese ( pdf )

 

Creative Commons License All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License