Emergency and growth of cover crops in function of the sowing depth

Leandro Pereira Pacheco, Fábio Ribeiro Pires, Fernando Pereira Monteiro, Sérgio de Oliveira Procópio, Renato Lara de Assis, Gilson Pereira Silva, Alberto Cargnelutti Filho, Marcos Lima do Carmo, Fabiano André Petter

Abstract


The objective of  this study was evaluated emergence of four cover crops at different seeding depths,  in order  to use  them  intercropped and oversown with annual crops. The experiment was  installed  in  a greenhouse, and  it was organized as a 5 × 7  factorial combination, with crop of fve cover crops:  Pennisetum glaucum var. ADR 300, ADR 500, and BN2, Eleusine coracana (fnger millet), and a cober  crop( hybrid  sorghum with  sudan-grass  [Sorghum bicolor x Sorghum  sudanese)];  seven cover crops  seeding depths: (0 cm without any mulch; 0 cm with a mulch of leaves over the seeds;1; 4; 8; 10; and 15 cm).The cover crops were cropping in vases for 40 days. It was evaluated emergence index, emergence time, plant height, green biomass and dry biomass of the above-ground part, leaf area, root dry biomass and root  length density. There was reduction of emergence when cover crops was seeded at zero cm depth with a mulch of leaves, except for the E. coracana, that had a better performance in the oversown. Pearl millets and hybrid S. bicolor x S. sudanense show up some restrictions when used in simultaneous consortium. The 15 cm sowing depth must not be used.


Keywords


No-tillage; Integrated system; Overcropping; Delay in the emergence.



DOI: http://dx.doi.org/10.5433/1679-0359.2009v30n2p305

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