Correlations between Polyacetylene Concentrations in Carrot (Daucus carota L.) and Various Soil Parameters

Abstract

This study assessed the concentrations of three falcarinol-type polyacetylenes (falcarinol, falcarindiol, falcarindiol-3-acetate) in carrots and the correlations between these and different soil traits. A total of 144 carrot samples, from three different harvests taken a single season, were analysed in terms of their polyacetylene concentrations and root development. On one of the harvesting occasions, 48 soil samples were also taken and analysed. The chemical composition of the soil was found to influence the concentrations of falcarinol-type polyacetylenes in carrots. When the total soil potassium level was 200 mg/100 g soil, the concentration of falcarindiol (FaDOH) in the carrot samples was 630 μg/g DW, but when carrots were grown in soil with a total potassium level of 300 mg/100 g soil, the FaDOH concentration in the carrots fell to 445 μg/g DW. Carrots grown in soils generally low in available phosphorus exhibited higher levels of falcarindiol if the soil was also low in available magnesium and calcium. The concentrations of polyacetylenes in carrots were positively correlated with total soil phosphorus level, but negatively correlated with total soil potassium level. Of the three polyacetylenes analysed, FaDOH concentrations were influenced most by changes in soil chemical composition.

Influences of Biodynamic and Conventional Farming Systems on Quality of Potato (Solanum Tuberosum L.) Crops: Results from Multivariate Analyses of Two Long-Term Field Trials in Sweden

“…In the statistical evaluation of the UJ-trial, there was a strong correlation ( p < 0.001) between increasing amounts of crude protein and lower EAA-indices, lower amounts of ascorbic acid, lower dry matter content, lower taste scores, higher cooking discoloration, faster extract decomposition and faster darkening of potato extract or of potato tissue [38]. Similar correlations between these variables were found in the K-trial [35]. …”

“…The differences between the systems were also expressed differently between parameters. For example in the K-trial, the trait extract decomposition expressed bigger differences between manure systems when the cultivar Grata was used in comparison to periods when the cultivars King Edward, Bellona and Provita were used [35]. …”

“…The soil conditions needs time to establish. The nine year trial period of the UJ-trial must be considered as short, but, even after 33 years, the soil fertility were still developing in the K- trial [35]. …”

“…The analyses used in connection with the K-trial and both the main and the additional UJ-trial are described more in detail elsewhere [35,38,43]. In short, the following analyses were used in the principal component analyses (the short designation of each analysis used in the figures are written in italics):…”

“…The field experiment, called the K-trial, included eight different fertilizer treatments. Various quality parameters and quality-assessment methods were developed and tested during the experimental period [35,36,37]. …”