The Perspective in Organic Farming in Relation to Human Health

Organic plant production is characterised by a relatively low level of nutrient supply. Compared to conventional farming this leads to an earlier completion of vegetative growth and an earlier onset of maturity processes. Therefore, in general organic plant products are more mature than conventionally produced plant products. Organic animal production is based on the use of roughage, outdoor production and a lower growth rate compared to conventional farming. As an effect of these production system differences a number of differences in food quality is predictable and some of these have been documented in the literature. The review is based on existing literature and ongoing projects comparing nutrients, secondary metabolites and foreign compounds in organically and conventionally produced foods, respectively. Effects of well-known differences between the production systems are also included in the discussion, such as nutrient supply, feeding systems and varieties/breeds used

Renormalization-Group Flows and Fixed Points in Yukawa Theories

We study renormalization-group flows in Yukawa theories with massless fermions, including determination of fixed points and curves that separate regions of different flow behavior. We assess the reliability of perturbative calculations for various values of Yukawa coupling $y$ and quartic scalar coupling $\lambda$ by comparing the properties of flows obtained with the beta functions of these couplings calculated to different orders in the loop expansion. The results provide a determination of the region in $y$ and $\lambda$ where calculations up to two loops can yield reasonably reliable results.Comment: 15 pages, 7 figure

Higgs Critical Exponents and Conformal Bootstrap in Four Dimensions

We investigate relevant properties of composite operators emerging in nonsupersymmetric, four-dimensional gauge-Yukawa theories with interacting conformal fixed points within a precise framework. The theories investigated in this work are structurally similar to the standard model of particle interactions, but differ by developing perturbative interacting fixed points. We investigate the physical properties of the singlet and the adjoint composite operators quadratic in the Higgs field, and discover that the singlet anomalous dimension is substantially larger than the adjoint one. The numerical bootstrap results are then compared to precise four dimensional conformal field theoretical results. To accomplish this, it was necessary to calculate explicitly the crossing symmetry relations for the global symmetry group SU($N$)$\times$SU($N$).Comment: RevTeX, 32 pages. 4 figure

Inter-row subsoiling increases marketable yield in potatoes

Inter-row subsoiling increased average yield of 40-65 mm potatoes by 14 pct during 2001-2003. But there were significant differences between the years. In 2001, the yield increased by 49 pct, whereas it was unaffected or decreased in 2002 and 2003. Better understanding of optimal subsoiling conditions is needed to exploit the benefit of inter-row subsoiling

Kamdyrkning af hestehønne

I ét ud af tre forsøgsår var der en statistisk sikker forsinkelse af skimmeludviklingen i de parceller, hvor kartoffelrækker var afbrudt af hestebønner