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For the implementation of an agroforestry program with native caatinga species associated with cultivated species, preliminary studies should be carried out aiming at understanding possible allelopathic interference between species. In view of the above the present work had the objective to identify a possible allelopathic influence of dry leaves in the process of decomposition of Caesalpinia ferrea Mart. on the germination of cv. Canapu. The ironwood leaves were collected in the morning, then dried at 40oC, for 24 hours in an oven. The dried leaves were hand crushed and mixed with sand, using the following ratio of sand and dry leaves: 1: 0; 1: 1/2; 1: 1 and 1: 2 (v: v). The leaves present in each mixture were decomposed for a period of zero; 15; 30; 45 and 60 days for subsequent seed sowing. The analyzed variables were percentage of emergency (PE), rate of emergency (IVE) and mean time of emergency (SMT). The design was completely randomized in factorial scheme 4x5. When the proportion of dry leaves of ironwood becomes larger than the proportion of sand, there is a reduction in the percentage of seedlings emersed, as well as an increase in the time of emergence of the seedlings of string bean, cv. Canapu. It is concluded that the consortium is not recommended between the native species pau ferro with the annual species cuerda bean, cv. Canapu, in early autumn that corresponds to the period when the trees lose their leaves, providing their accumulation in the soil.

enciclopédia biosfera

POTENCIAL ALELOPÁTICO DE FOLHAS SECAS DE Caesalpinia ferrea Mart. EM DIFERENTES PERÍODOS DE DECOMPOSIÇÃO SOBRE A GERMINAÇÃO DE Vigna unguiculata (L.) Walp, cv. Canapu