Sowing depth, soil texture, Ph and management of straw on germination of Rottboellia exaltata

Patricia Andrea Monquero, Neriane Hijano, Izabela Orzari, Renan dos Santos Sabbag, Andréia Cristina da Silva Hirata

Abstract


The grass camalote (Rottboellia exaltata Lf) has been reported as an important weed, may cause economic losses and difficulties in management in several crops. It was determined the seedling emergence of R. exaltata, at different depths of sowing (0, 0.5, 1, 5, 10, 12, 15 and 20 cm) in soils with different textures and pH values. It also assessed the effects of different amounts of straw Mucuna aterrima, Canavalia ensiformis and Crotalaria spectabilis, arranged on the surface or incorporated into the soil on the emergence and weed biomass. In sandy soil, the higher emergence of R. exaltata was 5.0 cm deep. In clay soil the pattern of emergence was similar; however, there was a greater reduction in emergency with the increase in sowing depth. The highest germination rate was observed in soil with pH ranging from 6.8 to 7.0, verifying lower germination in soil not corrected, at pH 5.3.The management of straw more effective in suppressing R. exaltata were 10 t ha-1 of C. spectabilis straw positioned on clayey soil and incorporated on the sandy soil, 5 t ha-1 of C. spectabilis incorporated on the sandy soil.


Keywords


Green manure; Supression; Biology; Grass camalote.



DOI: http://dx.doi.org/10.5433/1679-0359.2012v33n6Supl1p2799

Semina: Ciênc. Agrár.
Londrina - PR
E-ISSN 1679-0359
DOI: 10.5433/1679-0359
E-mail: semina.agrarias@uel.br
Este obra está licenciado com uma Licença Creative Commons Atribuição-NãoComercial 4.0 Internacional