Resumo

DE SA PEREIRA, E et al. Cover crops: poace and legumes as antecessors of the cultivation of sunflower in subhumedo bonaerense environment. FAVE. Secc. Cienc. agrar. [online]. 2020, vol.19, n.2, pp.60-75. ISSN 1666-7719.

Cover crops (CC) are used traditionally to control erosion problems, improve water collection, distribution and storage, reduce compaction, and improve soil carbon and nitrogen balances. This work aimed to provide zonal results regarding the contributions of CC on resource use efficiency and sunflower productivity. During 2017 and 2018, six CCs as sunflower predecessors in Coronel Suárez (Southwest of Buenos Aires) were tested. Soil water and dry matter, nitrogen and vegetable yield were evaluated. The difference in edaphic water content upon drying of the CC with respect to the conventional fallow (BC) varied between -8 and 15 mm. The water use efficiency (EUA) ranged from 5.59 kg MS mm-1 in vetch (V1) and 16.16 kg MS mm-1 in oats (A). The highest yields were obtained with V1 (2379 kg ha-1) and the lowest with A (1561 kg ha-1).

Palavras-chave : Vetch; Rye; Dry matter; Water cost; Production.

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