Abstract
Factors as variety, soil and climatic conditions can influence the nutritional composition of walnuts and its resultant biological activity. The aim of this work was to study the influence of soil and climate factors in the antioxidant capacity of 10 different varieties of nuts, obtained from two experimental cultivars with different weather and soil conditions. Ten different varieties of walnut samples were obtained from two experimental cultivars, analyzing the antioxidant capacity by ORAC, DPPH• and ABTS+ methods. Eureka and Tehama walnuts showed the highest antioxidant capacity. Only Chico and Serr varieties (measured by ABTS+ method) and Franquette variety (measured by ORAC assay) increased their antioxidant capacity when cultured in Torre Blanca plots. The growing in El Chaparral plots increased the antioxidant capacity of every different variety. Minor temperature (especially when it reaches over -0 ºC) and humidity, as well as an increase on the annual rainfall are noteworthy factors that influence on the increase of antioxidant capacity of the wide majority of the analyzed walnuts.
Highlights
Walnut is specie adapted to temperate and continental climates
Ten different varieties of walnut samples were obtained from two experimental cultivars, analyzing the antioxidant capacity by ORAC, DPPH and ABTS+ methods
Minor temperature and humidity, as well as an increase on the annual rainfall are noteworthy factors that influence on the increase of antioxidant capacity of the wide majority of the analyzed walnuts
Summary
Walnut is specie adapted to temperate and continental climates. For nut production, the ideal habitat coincides with temperate climate similar to the Mediterranean. The early frost in autumn and winter temperatures too low can cause significant damage to the tree, while late frosts in spring reduce or cancel production, besides damaging new shoots. Excessive humidity favors the incidence of disease, supporting high summer temperatures. Walnut adapts to drought and different soil types, but it is typical to perform crop irrigation as well as use deep soils, fertile, not too alkaline. In compact land it is poorly adapted (Salvadó et al, 2005)
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