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Analysis of the Content of Macroelements in Soil and Seeds of Winter Rape (Brassica Napus Var. Napus) as a Result of Fertilization Using Two-Component Mineral Fertilizers

100%

Stankowski S. , Hury G. , Sobolewska M. , Gibczyńska M.

tom Vol. 20, nr 4

61--68

The subject of the study was an analysis of the influence of two-component mineral fertilizers of Polish, Lithuanian and Russian production on the changes in the soil pH and the contents of available phosphorus and potassium as well as exchangeable magnesium after winter rape cultivation and the content of macroelements in winter rape seeds. The study also focused on the effect of using varying doses of fertilizers. A two-year field experiment was carried out on soil belonging to loamy sand, the IVa bonitation class. The experimental plant was winter rape, DK EXPLICIT hybrid. The experiment was established using random blocks design in 4 replicates. Two factors were compared in the studies: I. factor – 3 two-component mineral fertilizers of Russian, Lithuanian and Polish production (POLIDAP®). II. factor – 3 doses of fertilization (minimum, optimum, maximum, which were respectively: 1.0, 2.0, 3.0 dt per hectare). Introducing the two-component fertilizers and diversification of their doses was a factor that did not change the soil acidification. The applied two-component fertilizers (Russian, Lithuanian and Polish POLIDAP®) caused an increase in the amount of available phosphorus in the soil, with no differences depending on the fertilizer type. Diversification of the two-component fertilizers and potassium salt doses was reflected in a significant, but not proportional to the dose, increase in the amount of available phosphorus and potassium in the soil. While using fertilizers of Russian, Lithuanian and Polish production (POLIDAP®) during rape cultivation, there was no difference in the nitrogen, phosphorus, magnesium and sulfur contents in the seeds of cultivated winter rape of hybrid DK EXPLICIT cv.

Identification of Threats to the Soil and Water Environment on the Example of an Inactive Landfill Site

72%

Pusz A. , Wiśniewska M. , Rogalski D. , Grzyb G.

tom Vol. 19, nr 4

181--190

Pollution migration is the main problem of the landfills that have been located, installed and operated without meeting basic environmental protection requirements. Undertaking effective reclamation treatments is conditioned by a good recognition of the object and its close and distant surroundings. The purpose of the work was to determine the potential hazard to the soil and water environment, based on selected factors, in the vicinity of a closed waste landfill at Głębocka Street in Warsaw. In the soil samples taken at the site from various depths, high concentrations of chlorides, EC, ammonium nitrogen and phosphates were found. Furthermore, the high ammonium nitrogen content correlated with the scent of ammonia, and the content of phosphates with the scent of organic compounds. These pollutants testify to the progressive decomposition of substances occurring in the mass of littering waste, which may pose a serious threat to groundwater. The landfill is also a potential geotechnical hazard because it is a dynamically changing object that can change stability, create caverns and landslides.

Wpływ wzrastających dawek CaCo3 na zawartość przyswajalnego fosforu i potasu w glebie nawożonej [KPO3]n, K2HPO4 i K3PO4. I. Fosfor

44%

Zawartka L. , Huszcza-Ciolkowska G.

tom 61

177-184

W doświadczeniu laboratoryjnym badano wpływ (KP03)n, K2HPo4 i K3P04 na dynamikę przyswajalnego fosforu w glebie w zależności od pH, w ciągu sześćdziesięciu dni. Dynamika zawartości przyswajalnego fosforu w glebie nawożonej K2HP04 i K3P04 przebiegała podobnie jak po nawożeniu superfosfatem potrójnym+KCl (maksimum 63.5-92.3 % dawki P odzyskano w dziesiątym dniu). W glebie o pH 4.3-5.1 nawożonej (KP03)n zawartość przyswajalnego fosforu utrzymywała się na wyrównanym poziomie w ciągu sześćdziesięciu dni (35.4-46.1 % dawki P), natomiast w glebie o pH 5.8-6.3 obniżyła się w początkowym okresie.

The effects of (KP03)n, K2HPO4, and K3P04 on the available phosphorus dynamics in soil, as dependent on its pH, were examined in the course of a 60-day-long laboratory experiment. The dynamics of available phosphorus content in soil fertilized with K2HP04 and K3P04 went along similar lines as the one after fertilization with triple superphosphate+KCl (the maximum 63.5-92.3% of P dose was regained on the 10th day). In soil characterized by pH 4.3-5.1 and fertilized with (KP03)n, the content of available phosphorus remained on a constant level throughout the 60 days (35.4-46.1% of P dose). In the case of soil with pH equal to 5.8-6.3, it decreased at the initial stage.