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Título
Effects of Leonardite Amendments on Vineyard Calcareous Soil Fertility, Vine Nutrition and Grape Quality
Autor
Facultad/Centro
Área de conocimiento
Título de la revista
Plants
Número de la revista
3
Cita Bibliográfica
Olego, M. Á., Cuesta Lasso, M., Quiroga, M. J., Visconti, F., López, R., & Garzón-Jimeno, E. (2022). Effects of Leonardite Amendments on Vineyard Calcareous Soil Fertility, Vine Nutrition and Grape Quality. Plants, 11(3). https://doi.org/10.3390/PLANTS11030356
Editorial
Basel MDPI AG
Fecha
2022
Resumen
[EN] Vineyard calcareous soils are usually low in organic matter, which makes them prone to
physical, chemical, and biological degradation. Besides, these soils are also usually poor in various
nutrients in plant-available form, e.g., iron. To make up for this lack of soil fertility, on the one
hand, manures, and on the other, iron chelates are usually used. However, the soil application of
these materials is not free from problems, and other amendments based on leonardites could be
advantageously used as an alternative. Therefore, two organic amendments, one leonardite alone
(1 Mg/ha), and the other leonardite (1 Mg/ha) plus ferrous sulphate heptahydrate (0.5 Mg/ha),
were tested for three years in a commercial vineyard calcareous plot under Mediterranean climate.
The effects of these amendments on soil fertility, plant nutrient contents, and berry quality were
studied against a control of bare soil by means of a fully randomized trial with three repetitions
per treatment. Soil organic matter (SOM) increased as a consequence of both leonardite treatments,
but much more than expected on the basis of a simple mass transfer from the amendments. With
the ferrous-sulphate-heptahydrate-supplemented leonardite, the increase in SOM was noticeably
higher. This is explained on the basis of nutrient quantity and intensity-pH-related effects, which
increased soil nutrient plant-availability and presumably enhanced vine root growth. In response
to the higher plant availability of nutrients, the petiole nutrient concentrations were observed to
increase under the leonardite treatments. However, only a trend to increase potassium in petioles
and in grape must, linked to a decrease of grape must pH, was observed in harvest quality under the
leonardite treatments. Leonardite and adequately supplemented leonardite seem to have potential for
increasing SOM contents and nutrient plant-availability, thus improving the soil fertility of vineyard
calcareous soils.
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