International Scientific Journals
of Scientific Technical Union of Mechanical Engineering "Industry 4.0"

The use of complex mineral, organo-mineral and organic fertilizers on Haplic Chernozems for 8 years leads to changes in the composition of soil organic matter. Certainly the organic fertilizer ExcellOrga and its combination with the complex mineral fertilizer Suprefos increase the content of soil organic carbon, and humic acids, related with calcium. A positive trend is also the increase of carbon in insoluble residue. A statistically reliable positive influence of organic and organo-mineral fertilization on individual groups and fractions compared to those in the control variant was established. The trend is especially well expressed on the carbon values of humic acids and those related to calcium. This leads to a sustainable level of humification and an increase in the share of agronomically valuable groups and fractions in the organic carbon of the soil.

This study examines the potential of digestate, a byproduct of anaerobic digestion, in organic farming and its environmental implications. The EU produces around 180 million tons of digestate annually, mainly from agricultural sources. Renewable energy policies have promoted the use of biogas digestate. Analyzed the organic carbon concentration in digestate extracts using ultrasonic bath methods with water and potassium hydroxide solution. The study highlights factors influencing organic carbon concentration, including raw material origin, extraction time, temperature, and solvent type.

Deserts cover about one-fifth of the Earth’s surface and most of them have a considerable amount of specialized vegetation which is important for soil conservation..Two species of Saxaul (Haloxylon ammodendron and Haloxylon aphyllum) are the dominant plants in the vast deserts of Iran and both of them are the major plants for afforestation in the desert area. Due to the large area of land planted with Saxaul, the importance of these lands as carbon storage, become more and more. This study carried out in Boeen Zahra desert region of Iran in order to evaluate carbon storage in Saxaul Forests. Study area is located in the south of Qazvin province. Sampling was done in Saxaul (Haloxylon aphyllum) stands and the native vegetation of adjacent area (Control area). In both areas, the amounts of aboveground and underground biomass of the species were calculated by cutting and weighing the aerial parts (leaves, stem), roots, and soil Sampling was carried out to a depth of 30 cm. The comparison of the carbon content of H. aphyllum in the unit of the measuring surface and control areas showed the difference of this ability between two areas. (p<0.01). The results indicated that the total soil carbon content of H. aphyllum (1453.2 kg/ha) was significantly (p<0.01) more than the control area (314.3 kg/ha).

In the years 2013-2018 at Agro-Land farm at Śmielin (53°09′04.0″N; 17°29′10.7″E; 93,8 m a.s.l.), Poland, the strip-till technology (soil strip loosening, fertilizer application and seed sowing in one pass hybrid machine Mzuri Pro-Til, Mzuri Ltd.) was compared with plough tillage and ploughless tillage, after which the seedbed was prepared, fertilizers were applied and then sowing was performed. After 5 years of using the strip-till technology, in comparison with plough and ploughless cultivation, the content of: organic carbon, available forms of macroelements, the share of water stability soil aggregates, as well as the number of: total bacteria, total fungi, earthworms increased in the top layer of the soil.

The paper presents summarized results of lysimetric experiments intended to determine the impact of green manure crops and straw on chemical elements leaching (N, K, Ca, Corg) and of atmospheric precipitation infiltration in sandy loam Luvisol. Lysimeter surface area is 1.75 m2, the test soil layer is 0.60 m. It was determined that under climatic conditions of Lithuania, cover crops for green manure reduce atmospheric precipitation infiltration in sandy loam soil during autumn, and the effects of nutrient leaching depend on the plant species. Fabaceae plants clover (Trifolium pratense L.) stimulate nitrogen leaching, while Poaceae orchard grass (Dactylis glomerata L.) and Brassicaceae fodder radish (Raphanus sativus L.) lessen it. Incorporation of green manure biomass does not alter potassium and calcium leaching, but substantially reduces the organic carbon leaching.