Abstract
The objective of this study was to evaluate the effect of drought on biomass of different cover crops. The experiment was conducted in a greenhouse at the experimental campus of the Federal University of Piaui (UFPI), on soil classified as Yellow Latosol dystrophic. The treatments were composed by five species of cover crops ( Brachiaria brizantha cult. Xares; Pennisetum glaucum cv. ADR 300; Brachiaria ruziziensis ; Mucuna aterrima ; Pennisetum. glaucum cv. ADR 7010) and four irrigation intervals levels (2, 4 6 and 8 days). Independent of the levels of water deficit, the highest biomass were obtained in species B. brizantha , B. ruziziensis , P. Glaucum cv. ADR 300 and ADR 7010. There was greater tolerance of M. aterrima levels of water deficit. The species of B. brizantha and B . ruziziensis accumulated 70% of the dry weight of tops of sheets, while P. glaucum cv. ADR 300 and ADR 7010 accumulated 60% of the stem. Even with reductions in biomass under water deficit conditions, the species B. brizantha and B. ruziziensis have potential for soil cover and P. glaucum residues as a source for the maintenance of soil organic matter.
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