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Seed germination and emergence of Eragrostis tenuifolia (A. Rich.) Hochst. ex Steud. in response to environmental factors

100%

Bittencourt H. H., da Silva Bonome L. T., de Bortoli Pagnoncelli,Jr F., Lana M. A., Muzell Trezzi M.

Journal of Plant Protection Research

2016

tom 56

nr 1

Eragrostis tenuifolia is a weed species that is gaining ground in Brazil. This weed occurs in pastures, grasslands, crop fields, and roadsides. The objective of this study was to examine the effects of different environmental factors on E. tenuifolia seed germination and seedling emergence. The optimum constant temperature for germination was around 35–30°C. It was also found that 85% of seeds germinated under a 30/20°C alternate temperature regime. Light appears to have a positive effect on seed germination. No seedlings emerged when seeds were buried 3 cm or deeper. The results suggested that E. tenuifolia has the potential to spread into pastures and in no-tillage crop systems in Brazil. Measures such as the use of cover crops and/or soil cultivation can be used to limit germination and seedling emergence, respectively.

Effect of Winter Cover Crop Biomass on Summer Weed Emergence and Biomass Production

86%

Bittencourt H. H., Lovato P. E., Comin J. J., Lana M. A., Altieri M. A., Costa M. D., Gomes J. C.

Journal of Plant Protection Research

2013

tom 53

nr 3

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.

Ograniczanie wyników

2 Journal of Plant Protection Research

2 Bittencourt H. H.

2 Lana M. A.

1 Altieri M. A.

1 Comin J. J.

1 Costa M. D.

1 Gomes J. C.

1 Lovato P. E.

1 Muzell Trezzi M.

1 da Silva Bonome L. T.

1 de Bortoli Pagnoncelli,Jr F.

1 2016

1 2013

Wyniki wyszukiwania

Seed germination and emergence of Eragrostis tenuifolia (A. Rich.) Hochst. ex Steud. in response to environmental factors

Effect of Winter Cover Crop Biomass on Summer Weed Emergence and Biomass Production