Effect of variety, soil fertility status and agronomic treatments on carrot mineral and phytochemical composition and consumer liking of flavor traits

Abstract

BACKGROUND: The aim of this study was to investigate the effects of variety (Nantes and Imperator), soil fertility status (high and low) and agronomic treatments on yield and quality traits of carrot composition and sensory factors. The treatments compared synthetic nitrogen at conventionally recommended amounts with compost-sourced nitrogen (high and low rates) and a range of amendments (compost, compost tea, micronutrients and foliar treatments). Additionally, we intended to identify factors affecting polyacetylene accumulation in carrots, owing to the growing interest in their health effects and paucity of agronomic information on their bioaccumulation in carrots.RESULTS: Imperator accumulated more minerals, produced more phytochemicals and had higher antioxidant capacity than Nantes, which had more carotenoids. However, consumers preferred the flavor of Nantes over Imperator. High-fertility soil produced carrots of superior nutritional quality than did low-fertility soil, regardless of year-of-application amendments, the effects of which were often variety-dependent. High soil biological activity was able to overcome low fertility status and stimulate greater yield. Carrot phosphorus was correlated with falcarindiol biosynthesis. Chlorogenic acid and falcarindiol were correlated with antioxidant capacity, but not falcarinol or total phenolic compounds. CONCLUSION: Carrots were not strongly affected by agronomic treatments in terms of yield or phytochemical status; however, soil biological activity overcame a soil nutrient deficit in terms of yield. Phenolic compounds and antioxidant status were generally higher in the high-fertility site, whereas polyacetylenes were variety-dependent. Chlorogenic acid and falcarindiol were associated with antioxidant capacity, but not total phenolic compounds and carotenoids. Sensory analysisCharacteristics of consumer liking were evaluated with both varieties of carrot from the synthetic and combined treatments of the HFS (2016 only). Ninety-two participants were recruited from J Sci Food Agric 2019; 99: 5457-5474

Assessment of Mineral and Vitamin Contents of Carrot (Daucus carota L.) as Influenced by Poultry Manure, Variety and Tillage

“…Tillage practices can impact soil structure, nutrient availability, and microbial activity, subsequently affecting crop nutrient uptake and accumulation. 10 The present study, which revealed a better response of bed over ridge tillage system on the nutrient accumulation in carrot roots, did not prove true with a previous study, where carrots grown on a Ridge showed a tendency to produce higher yield metrics, proof of higher efficiency in mineral absorption and accumulation in the roots. 11 Previously, a study also reported higher assimilation and accumulation of some macro elements (Nitrogen, Phosphorus, Potassium, Calcium, and Magnesium) in carrot roots planted on the bed system of tillage than those harvested from ridge and furrow systems of cultivation.…”

“…The application of organic fertilizer can improve the soil's mineral composition, which in turn helps plants absorb more nutrients from the soil and increase its constituent parts. 10 A significant (p < 0.05) variation among the tillage × variety interactions was observed only in Mg content. Bed × Kurado (4.7%) and Ridge × Tmega (4.7%) interactions were statistically similar in response and accumulated higher Mg content than the other interactions.…”

“…These tillage practices can impact soil structure, nutrient availability, and microbial activity, subsequently affecting the nutrient uptake and accumulation in crops. 10 A previous study reported that carrots grown on Ridge did not differ statistically (p > 0.05) from the bed system. However, it showed a tendency to produce higher yield metrics, proof of higher efficiency in mineral absorption from applied poultry manure and presumably, higher accumulation of minerals in the carrot roots.…”

Plant Polyphenols-Biofortified Foods as a Novel Tool for the Prevention of Human Gut Diseases

“…In fact, both conventional or organic farming could concur to nitrogen supply, which is an important parameter influencing either primary and secondary metabolites biosynthesis. However, in the case of polyphenols limited effects have been reported in some cases [112]. In others, a high nitrogen supply in the soil negatively impacted on the flavonoid accumulation in broccoli, basil and tomato [110], or on the anthocyanins content in grapevine berries (Table 3) [113].…”

Yield and nutritional value of two carrot cultivars in response to Linuron pre and post-emergence and three planting systems

“…Irrespective the herbicide add-on time, drilling in rows was much better for Chantenay and spreading on rows for Nantes to maximize the antioxidant activity. Stefanson et al (2019), by comparing two carrot cultivar (i.e. Imperator and Nantes), observed a lot of phytochemicals and had higher antioxidant power in Imperator cultivar than Nantes, which had higher carotenoids content.…”