Abstract
The nutritional value and the content of bioactive compounds in potato tubers are influenced by many soil, climate and agrotechnical factors. This study investigated the effect of drip irrigation and nitrogen fertilization by broadcasting and fertigation on the content of dry matter, starch, monosaccharides, total sugars, vitamin C, polyphenolic compounds, chlorogenic acid and antioxidant activity in tubers of “Augusta” potatoes. Additionally, the magnitude of the changes in the tested components during their long-term storage (6 months) was also assessed. Drip irrigation had a significant positive effect on the content of dry matter, starch, vitamin C, monosaccharides, sucrose, total sugars, total polyphenols, chlorogenic acid and antioxidant capacity. Compared to broadcasting fertilization, fertigation significantly increased the content of vitamin C, total polyphenols and chlorogenic acid, as well as the antioxidant activity of potato tubers. Long-term storage contributed to a decrease in the tested components. The exception was the content of monosaccharides, where a more than twofold increase was noted, especially in the case of irrigated tubers. The results of the research showed a beneficial effect of drip irrigation and fertigation on the content of bioactive compounds and the nutritional value of “Augusta” potato tubers.
Highlights
IntroductionThe period from the beginning of flowering to the yellowing of the plants is the period in which the potato plants accumulate their yield; i.e., the tubers increase in size and weight
This study showed that irrigation had a significant positive effect on the content of all tested nutrients and bioactive compounds, as well as on the antioxidant capacity of potato tubers (Tables 1–10)
Current research on the influence of drip irrigation and nitrogen fertilization by fertigation or broadcasting on the content of nutrients and bioactive compounds in “Augusta” potato tubers showed that drip irrigation had a positive effect on the level of the tested components
Summary
The period from the beginning of flowering to the yellowing of the plants is the period in which the potato plants accumulate their yield; i.e., the tubers increase in size and weight During this period, the soil moisture should be at the level of about 70% of the field water capacity [1]. Water-soluble fertilizers in the concentrations required by the plants are delivered with each irrigation or at regular intervals by drip irrigation to the root zone, in accordance with the physiological requirements of the crops This makes it easier to match fertilizer application with plant nutrient needs, reduces nutrient loss and can result in relatively high fertilizer application and efficiency; it does not flatten the ridges [11,12]. The level of changes in the content of tested chemical compounds during the long-term storage of potato tubers was determined
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