The impact of long-term application of inorganic nitrogen fertilizers and manure on changes of selected properties of organic matter in sandy loam soil

Abstract

The aim of the research was to assess the effect of long-term application of different doses of nitrogen fertilizers with or without manure to changes in the total organic carbon content, total nitrogen content, evaluation of dissolved organic carbon content and the value of absorbance coefficient (A 4/6 ) in sandy loam soil. The base of research was the long-term field experiment, established in 1979 at the Wierzchucinek Experimental Station close to Bydgoszcz city -Poland. The experiment was carried out in the three-course crop rotation, potato, rye, rye in randomized split-plot design. The experimental treatments were four levels of N fertilizers in 0, 47, 93, and 140 kg•ha -1•yr -1 (N 0 , N 1 , N 2 , N 3 ) as a 1 st factor of experiment, and the same doses of N fertilizers with farmyard manure application (30 t•ha -1 ) as a 2 nd factor. After 36 years of experiment the content of total organic carbon was 26% lower and the content of total nitrogen 13% higher compared to the values determined before the experiment foundation (1979). The consequence of changes in the content of organic carbon and total nitrogen, are changes in the ratio of organic carbon content and total nitrogen content. It was noticed that the use of manure and different nitrogen doses resulted in a decrease of organic carbon content and total nitrogen content value. After application of different nitrogen doses, organic carbon content ranged from 122.4 to 152.2 mg•kg -1 . The same nitrogen doses applied simultaneously with farmyard manure increased the organic carbon content, . The changes of the organic carbon content did not effect on percentage of this fraction in the total organic carbon. Percentage of organic carbon content in total organic carbon content was on averaged 1.6%. After the application of different nitrogen doses, humic acids of analyzed soils were characterized by lower average value of A 4/6 (5.4). However, the application of nitrogen doses with manure brought a higher -6.3 -A 4/6 value. Farmyard manure application caused the formation of humic acids of lower molecular weight and a low humification degree.Keywords: evaluation of dissolved organic carbon content, long-term experiment, manure, nitrogen doses, organic matter, total nitrogen content, total organic carbon content Streszczenie Celem pracy było zbadanie wpływu długookresowego nawożenia zróżnicowanymi dawkami azotu stosowanymi z obornikiem lub bez tego nawozu na zmiany zawartości ogólnego węgla organicznego (OWO), azotu ogółem (N og ), rozpuszczalnego węgla organicznego (RWO) w glebie oraz określenie wartości absorbancji (A 4/6 ). Podstawą badań było statyczne wieloletnie doświadczenie polowe, założona w 1979 roku w Stacji Badawczej w Wierzchucinku koło Bydgoszczy. Prowadzono je w trzyletnim, uproszczonym zmianowaniu: ziemniak -żyto ozime -żyto ozime. Pierwszym czynnikiem doświadczenia było zróżnicowane nawożenie azotem, dawki w kg•ha ). Po 36 latach stosowanego nawożenia średnie zawartości węgla oznaczone w próbkach glebowych były średnio niższe o 26%,...

Influence of 96 years of mineral and organic fertilization on selected soil properties: a case study from long-term field experiments in Skierniewice, central Poland

“…It is commonly known that long-term use of manure increases the content of various components in the soil (e.g. soil organic carbon (SOC), TN, as well as macronutrients and micronutrients) (Wang et al, 2009;Li et al, 2010;Kołodziejczyk et al, 2017;Murawska et al, 2017). Besides, the application of completely NPK mineral fertilizers for a long time also increases the SOM (Mercik et al, 2005).…”

“…The use of fertilizers can increase plant and root biomass, eventually leading to an increase in soil organic matter (SOM) (Tian et al, 2015). Murawska et al (2017) showed that after 36 years of applying NPK fertilizer to sandy-loamy soil with or without manure, the SOM content increased, and the humus quality in the soil also improved. The use of certain fertilizers (e.g.…”

Sorption Capacity of Sandy Soil Under Long-Term Fertilisation

“…In addition to the increase in yields, the use of fertilisers in the soil can increase the biomass of plants and roots, eventually resulting in SOM increase (Tian et al 2015). Murawska et al (2017) have shown that after 36 years of fertilising the sandy soil by NPK without or with farmyard manure, the content of SOM increased, and at the same time the quality of humus improved in this soil. Higher content of SOM and humus quality are considered to be major factors influencing soil sorption complex.…”