Impact of multi-annual mineral fertilization with NPKCa on the content and uptake of magnesium by eastern galega

This paper presents the changes in the magnesium content in soil and plants and in the uptake of this element in yield under the influence of NPKCa fertilization. Eastern galega (Galega orientalis Lam.) was cultivated in 2005-2009. A field experiment was conducted on the experimental plots of the Siedlce University of Natural Sciences and Humanities. Thirteen levels of fertilization were included in the study: without fertilization, N20, P50, K150, N20P50K150, N20P50, N20K150, P50K150, N20P50K150Ca150, P50K150Ca150, Ca150, N20K150Ca150, N20P50Ca150. Three swaths of the test plants were harvested at budding in each year of the study. The total content of magnesium in soil and in plants was determined with the ICP-AES method on an emission spectrophotometer with inductively-coupled plasma. The applied mineral fertilization with NPKCa did not have any significant impact on the average magnesium content in soil. The highest (significantly) content of magnesium was determined in eastern galega biomass harvested from the plots fertilized with Ca150 as dolomite calcium in all years of the experiment (the mean for the years: 2.91 g kg-1 d.m.). The average content of Mg in the subsequent swaths was as follows (in g kg-1 d.m.): swath I (2.04) swath III (2.39). The determined content of magnesium in eastern galega in the subsequent years of the experiment ranged between 2.22 g kg-1 d.m. in 2006 and 2.83 g kg-1 d.m. in 2008. The highest uptake of magnesium in eastern galega yield (73.78 kg Mg ha-1) was recorded on a plot fertilized with N20P50Ca150 in 2008

The effect of different potassium fertilization of forecrop on the enzymatic activity of soil in spring barley cultivation

Celem badań było określenie zmian aktywności enzymatycznej gleby w czasie wegetacji jęczmienia jarego pod wpływem zróżnicowanego nawożenia przedplonu potasem. Doświadczenie polowe przeprowadzono w latach 2011 i 2013 w układzie całkowicie losowym w czterech powtórzeniach na poletkach doświadczalnych Uniwersytetu Przyrodniczo-Humanistycznego w Siedlcach. Przedplonem był groch siewny (Pisum sativum L.), pod który stosowano nawożenie: NK0, NK1, NK2, NK3, NK4, NK5 (N-20; K1-41,5; K2-83; K3-124; K4-166; K5-207,5 kg.ha–1). W uprawie jęczmienia jarego (Hordeum vulgare L.) uwzględniono nawożenie: N1,K0 N1K1, N1K1, N1K1, N1K1, N1K1 (N1-50, K1-41,5 kg·ha–1). Aktywność enzymów glebowych oznaczano czterokrotnie w czasie wegetacji, w próbkach pobranych z poziomu Ap (0-30 cm). Analizowana gleba charakteryzowała się bardzo wysoką aktywnością ureazy (średnio 365,5 mg N-NH4 h–1·kg–1 gleby). Największą aktywność dehydrogenaz oznaczono w glebie pobranej w czerwcu z obiektu nawozowego N1K1 (NK3 przedplon). Aktywność fosfatazy alkalicznej była dwukrotnie większa w porównaniu z aktywnością fosfatazy kwaśnej. Istotnie największą aktywnością fosfatazy alkalicznej (0,46-0,64 mmola PNP·h–1·kg–1 gleby) i kwaśnej (0,26-0,31 mmola PNP·h–1·kg–1 gleby) charakteryzowała się gleba pobrana z obiektu nawozowego N1K1 (jęczmień jary) NK1 (przedplon-groch siewny).The aim of the study was to determine changes of enzymatic activity of soil during spring barley vegetation. The field experiment was carried out in 2011 and 2013 with a completely randomised method, in four replicates, on the experimental plots of the Siedlce University of Natural Sciences and Humanities. The forecrop was pea (Pisum sativum L.), for which the following fertilisation was applied: NK0, NK1, NK2, NK3, NK4, NK5 (N-20; K1-41.5; K2-83; K3-124; K4-166; K5-207,5 kg ha–1). In spring barley (Hordeum vulgare L.) cultivation, six levels of fertilisation were applied: N1K0, N1K1, N1K1, N1K1, N1K1, N1K1 (N1-50, K1-41.5 kg ha–1). The activity of the enzymes was determined four times during vegetation, in soil samples taken from the Ap horizon (0-30 cm layer). The soil was characterised by very high urease act ivity (average 365.5 mg N-NH4 h–1 kg–1 dm of soil.) The highest activity of dehydrogenases was determined in the soil sampled in June from the N1K1 fertiliser treatment (NK3 forecrop). Alkaline phosphatase activity was twice as high as that of acid phosphatase. The highest activity of alkaline phosphatase (0.46-0.64 mmol PNP h–1 kg–1 dm of soil) and acidic (0.26-0.31 mmol PNP h–1 kg–1dm of soil) was characterized by soil taken from the fertiliser treatment N1K1 (spring barley) NK1 (forecrop-pea)