Journal of the science of food and agriculture · 2025
Preharvest potassium silicate treatments influence the morphological appearance and enhance nutritional composition of almond kernels.
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Serna-Escolano Vicente, Botella María Á, Allegra Alessio, Zapata Pedro J, Giménez María J
Аннотация
BACKGROUND: The almond industry requires new strategies to improve almond kernel quality. The use of biostimulants such as potassium silicate (KSi) is an eco-friendly and non-polluting alternative. The aim of this work was to investigate the preharvest application of KSi solutions at 2 and 20 mmol L-1 to 'Peraleja' almond trees during two consecutive seasons to elucidate the effect on almond kernel quality at harvest.
RESULTS: The fresh weight, length and width of almond kernels treated with 20 mmol L-1 KSi increased by 27%, 31% and 8%, respectively, compared to the controls. Furthermore, almonds treated with 20 mmol L-1 KSi had a more elongated morphological appearance, while with 2 mmol L-1 KSi almonds were more spherical. Regarding nutrients, phosphorus and potassium levels increased in almonds treated with 2 mmol L-1 KSi, while magnesium content decreased with both KSi treatments. Total antioxidant activity and total phenolic content increased in almonds treated with 20 mmol L-1 KSi. In addition, significant differences in fatty acid levels were observed, particularly in oleic and linoleic acids. On average, the oleic-linoleic acid ratio of almonds treated with 2 mmol L-1 KSi was 28% higher than those treated with 20 mmol L-1 KSi and the controls.
CONCLUSION: These results demonstrate that the preharvest application of KSi is a valuable tool, as growers can use different KSi concentrations to target specific improvements in almond kernel quality, including physical attributes and nutritional composition. © 2025 The Author(s). Journal of the Science of Food and Agriculture published by John Wiley & Sons Ltd on behalf of Society of Chemical Industry.
RESULTS: The fresh weight, length and width of almond kernels treated with 20 mmol L-1 KSi increased by 27%, 31% and 8%, respectively, compared to the controls. Furthermore, almonds treated with 20 mmol L-1 KSi had a more elongated morphological appearance, while with 2 mmol L-1 KSi almonds were more spherical. Regarding nutrients, phosphorus and potassium levels increased in almonds treated with 2 mmol L-1 KSi, while magnesium content decreased with both KSi treatments. Total antioxidant activity and total phenolic content increased in almonds treated with 20 mmol L-1 KSi. In addition, significant differences in fatty acid levels were observed, particularly in oleic and linoleic acids. On average, the oleic-linoleic acid ratio of almonds treated with 2 mmol L-1 KSi was 28% higher than those treated with 20 mmol L-1 KSi and the controls.
CONCLUSION: These results demonstrate that the preharvest application of KSi is a valuable tool, as growers can use different KSi concentrations to target specific improvements in almond kernel quality, including physical attributes and nutritional composition. © 2025 The Author(s). Journal of the Science of Food and Agriculture published by John Wiley & Sons Ltd on behalf of Society of Chemical Industry.