Pavol Trebichalský, Juliana Molnárová, Alena Vollmannová, Janette Musilová, Ján Tomáš
Food Sciences of Food Sciences
A field experiment was conducted to observe the effects of fertilization (with nitrogen, phosphorus and potassium) and application of different tillage: 1) conventional into depth 0.18-0.20 m and 2) minimalization into depth 0.10-0.12 m on micronutrient density (Cu, Zn) in grain of some varieties of barley. In 2009 the following levels were applied in experiment: a) control (not fertilized variant), b) fertilized (kg.ha-1: 70 N + 4.36 P + 16.6 K), c) fertilized (kg.ha-1: 60 N + 22.7 P + 36 K) and d) the same level of fertilizing as in previous variant, but also with addition of 25 kg.ha-1 of Ca.
Harvest was carried out in period of full ripeness and after mineralization of barley grain by dry way method the contents of Cu and Zn were assessed by spectrophotometer Varian DUO 240FS/240Z.
Type of chosen variety had weaker impact on uptake of trace elements in samples of winter barley; there was not any varietal relation to uptake of Zn. Application of fertilizers total reduction of contents of both metals, especially zinc, where significant discrepancies were evaluated with decline of values. Contents of Cu also mostly declined (besides varieties of winter barley). The influence of applied CaCO3 could not be accurately defined - in spring barley it caused an increase in Cu and Zn contents after application of conventional tillage and decline of contents of these elements after application of minimalization tillage, but contrary changes were evaluated in winter barley.