Abstract

ZERMENO GONZALEZ, Alejandro et al. Seaweed extract and its relation to photosynthesis and yield of a grapevine plantation. Rev. Mex. Cienc. Agríc [online]. 2015, vol.6, n.spe12, pp.2437-2446. ISSN 2007-0934.

The seaweed extracts as biofertilizers are natural sources that increase the growth and yield of crops and improve the harvest quality. Therefore, the objective of this study was to evaluate the effect of the application of the seaweed Saragassm spp., to a grapevine plantation (cv Shiraz), in the leaves chlorophyll content, net CO2 ecosystem exchange, yield and fruit quality. The study was established in the San Lorenzo wine company, Parras, Coahuila, during the 2014. The study was conducted in two sections of the grapevine plantation of 5.2 ha. On one of these sections, the seaweed extract was applied to the soil and foliage. To evaluate the leaves chlorophyll content and the yield and fruit quality, three treatments were established: control (with no application of the seaweed extract), with application only to the soil and with application to the soil and leaves. The CO2 ecosystem exchange (canopy level) was obtained applying the eddy covariance method, using one three dimensional sonic anemometer and one open path CO2/H2O analyzer. The results of the study showed that the application of the seaweed extract to the soil and leaves increased the leaf chlorophyll content (Tukey, α≤ 0.05), however, this was no reflected in a yield increase neither the fruit Brix degrees. The application of the extract only to the soil increased the juice acidity, while the application to the soil and plant leaves decreased the pH.

Keywords : eddy covariance; leaves chlorophyll content; net CO₂ ecosystem exchange; Sargassun spp..

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