Taro production, phytomass input by Sesbania and Flemingia and improvement in soil fertility in agroforestry systems in floodplains

Floodplains were the first deforested areas for agriculture use all over world. In Brazil these can be restored by growth of guanandi Calophyllum brasiliense, a slow-growing native forest species adapted to flooding. The aims this study to: (i) evaluate taro, Colocasia esculenta, management under two agroforestry systems (AFS) (Simple and Biodiverse) in succession reforestation with guanandi, (ii) contribution macronutrients from green manure Flemingia macrophylla Sesbania virgata, both managed using pruning respective AFSs, (iii) effects on soil nutrients levels compared monoculture (control). randomized block was designed eight replication 216.0 m² plots four rows six trees each line. simple AFS (SAFS), taro intercropped biodiverse (BAFS), Sesbania, banana shrub (Musa sp.), edible palm (Euterpe edulis) fourteen included. Production evaluated seasons high rainfall water scarcity. With floods has produced around 15 Mg ha-1 marketable corms SAFS 9 BAFS, but drought made commercial production unfeasible, no differences between cormels planting. However, enough rhizomes harvested new accumulated 17 fresh matter contributed 2 ha-1. Soil pH macronutrient content, especially K, significantly higher AFSs monoculture.