Resumen

LIMA, Márcio Emanoel de et al. Lettuce crop performance in organic tillage with and without mulching and at different irrigation water depths. Ciênc. agrotec. [online]. 2009, vol.33, n.6, pp. 1503-1510. ISSN 1413-7054.  http://dx.doi.org/10.1590/S1413-70542009000600007.

This work was carried out in order to evaluate the performance of a lettuce crop (Lactuca sativa L.) cultivated under different irrigation depths in ground with and without covering of gliricidia leguminosa. Two simultaneous experiments were conducted, in which 5 irrigation depths were applied, corresponding to 25, 50, 80, 100, and 115% of crop evapotranspiration (ETc). Final production was evaluated by means of the determination of fresh mass and leaf area. Up to the 100% ETc level, all the analyzed variables had their values increased. For the 115% level, there was a decrease of the same. In total fresh mass production, the system with covering was superior to the one without covering, not differentiating statistically to the 5% level probability for test F, except at depths of 25 and 115% ETc.

Palabras llave : Irrigation management; Lactuca sativa; production functions.