Effect of winter cover crop biomass on summer weed emergence and biomass production
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Universidade Federal da Fronteira Sul, BR-158 Km 7, CP 106, 85301-970, Laranjeiras do Sul (PR), Brazil
Universidade Federal de Santa Catarina (UFSC), 476 Trindade CEP 88040-900 Florianópolis, Santa Catarina, Brasil
Leibniz-Zentrum für Agrarlandschaftsforschung (ZALF), D-15374 Müncheberg, MO, Germany
University of California at Berkeley (UC Berkeley), 101 Sproul Hall, Berkeley, CA, USA
Empresa de Pesquisa Agropecuária e Extensão Rural de Santa Catarina (Epagri), 88034-901 Lages, SC, Brazil
Instituto Agronômico do Paraná (Iapar), 86047-902 Londrina, PR, Brazil
Submission date: 2012-08-27
Acceptance date: 2013-07-22
Corresponding author
Henrique von Hertwig Bittencourt
Universidade Federal da Fronteira Sul, BR-158 Km 7, CP 106, 85301-970, Laranjeiras do Sul (PR), Brazil
Journal of Plant Protection Research 2013;53(3):248-252
A greenhouse assay was carried out to evaluate the effect of winter cover crop residues on spontaneous plants that commonly occur on summer annual fields in Southern Brazil. Dry shoot residues of rye (Secale cereale), vetch (Vicia villosa), fodder radish (Raphanus sativus), and a mix of the three species, were applied over pots that had been seeded with alexandergrass (Brachiaria plantaginea), hairy beggarticks (Bidens pilosa), wild poinsettia (Euphorbia heterophylla), and morning glory (Ipomoea grandifolia) at four different depths (0, 1, 2, or 4 cm). Plant emergence and biomass production were measured. Residues of rye reduced the emergence of B. plantaginea, while vetch diminished I. grandifolia and B. plantaginea emergence. Fodder radish reduced emergence of I. grandifolia. The mix of cover crops reduced emergence of I. grandifolia, B. plantaginea, and B. pilosa. None of the cover crops differed from the control on E. heterophylla emergence. The lowest yields in spontaneous plant shoot biomass were obtained from the cover with rye + vetch + fodder radish. The lowest values of root biomass occurred under cover with rye, fodder radish or the mix. Use of vetch residues decreased emergence of B. plantaginea and I. grandifolia, but enhanced biomass accumulation by the latter.
The authors have declared that no conflict of interests exist.
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