One of the most important problem of the Polish agriculture is soil acidification and the low content of basic nutrients as well as high mobility of heavy metals. The research was conducted on the basis of a long-term (38 years) field experiment, which was located on the area of the UTP Research Station in Wierzchucinek that was found in 1974 on Podzolis (WRB 2014). Natural fertilizing or liming were not applied in the research. The effect of the 38 years' application of high doses of nitrogen (N83, N167, N250) and potassium (K0, K53, K105, K158) as well as the fodder-industrial crop rotation was soil acidification. The fertilization applied in the experiment significantly determined the contents of the assimilable forms of copper and zinc in the examined soil. On average, independent of a dose of potassium applied, the highest values of the parameters observed were found after the highest doses of nitrogen (N250) were applied. Essential correlations between the contents of the examined microelements in soil samples and their basic chemical parameters were also determined. The contents of the assimilable zinc and copper were significantly lower than the national average, but they all were in the low and average soil ...
Nowadays in Poland as well as in many parts of the world a number of research, aiming at comparing the quality of raw material produced by organic and conventional agriculture is being conducted. Relating to that, in this study the size and quality of potato tubers, wheat grains and carrot roots cultivated in two agricultural systems: organic and conventional have been compared. Research has been performed on raw material samples, gathered from five production fields located in the Kuyavian-Pomeranian Voivoidship (in years 2010-2012), two of which have been organic while three conventional. The representative samples of plants considered in study were analyzed for the content of: total protein in winter wheat grains and nitrates(V) and starch in the fresh mass of potato tubers and carrot roots. According to obtained results the yield of starch and total protein has been calculated. Conducted studies have proved that the yield and the amount of total protein in carrot roots, wheat grains and potato tuber varied depending on different agricultural system. The highest yield have occurred in conventionally farmed crops. Total protein content was highest in organically farmed carrot roots, while the highest nitrates(V) level was detected in conventionally farmed potato tubers. Wheat ...
