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EN
Global climate change is a fact that affects all components of the environment. The main aim of this research was to conduct the retrospective monitoring of soils in the Trans-Ural Steppe Zone (Russia) and the analysis in changing of key climatic parameters for the periods 1937-1982 and 1982-2019. We investigated average temperatures and precipitation (monthly and annual) using archived data from a nearby weather station, as well as data from NASA and weather forecast websites. We identified a decrease of soil fertility and an increase in alkalinisation processes over the past 37 years for the studied area. Comparison of these periods showed an increasing the average monthly and annual air temperatures (on 1.4°C) and a decrease in the amount of precipitation in the summer (on 4.4 mm) period. We found that a more arid climate accelerates the rate of soil salinization due to the active evaporation of groundwater. Nevertheless, in some areas there were found the soil desalinization due to the change in the hydrologic regime and lowering of the groundwater level. In general, the climate changing in the studied region is consistent with global warming trend. Increased average annual temperature and reduced precipitation in summer period contribute to aridization of the region. Such conditions will more restrict soil fertility due to development of salinization and desertification processes.
EN
Modern technologies make it possible to obtain a lot of diverse information about the soil properties using satellite images, but field studies are also required to create or refine digital soil maps. To create a digital soil map scaled 1:25 000 in 2016, a classical field study was conducted with the laying of soil sections in places with the same coordinates as in the mapping of 1982. It allowed to carry out retrospective monitoring of transformation of morphogenetic and agrochemical properties of soils of the southern forest-steppe of the Republic of Bashkortostan (Russia) for the 34-year period of farm use. Thus, the correction and digitization of the soil map allowed to establish that arable land occupies 69.792 ha (67.9%) in the structure of agricultural land (102 811 ha). The monitoring showed deterioration of the main characteristics of arable soil fertility: the diminishing of humus-accumulative horizons, significant decrease of humus content (p ≤ 0.05), a small but reliable acidification of the medium reaction and reducing labile phosphorus. Losses of organic matter occurred mainly in the most fertile soils; their proportion decreased from 55.9% of the total area of agricultural land to 12.4%.
EN
The issues of soil fertility preservation are relevant in all countries of the world. Concrete actions, technological and organisational solutions allowing to overcome this complex and continuous phenomenon by using exclusively agroengineering approaches are proposed. The preservation of the structure of agricultural soils requires urgent adoption of technological and organisational decisions in the following areas: maximum limitation of immobilisation of nitrogen in the soil after introduction of organic residues into the soil; development of technological methods and tools for the soil cultivation, aimed at loosening the surface layer of the soil with a minimum area of its contact with the airborne environment; improvement of the fundamentals of aggregation of agricultural machines, taking into account the maximum permissible slipping of wheeled energy facilities at the level of 15%, and a conceptual approach to their ballasting with respect to the requirements of the tire ecophilicity; application of a soil structure indicator when determining the ploughing frequency by means of ploughs with skimmers or their twotier analogs; wide practical application of the controlled traffic farming system; adoption of a legislative document on specific conformity of the land users for the level of soil fertility for agricultural purposes.
EN
Rice is the main crop in the irrigated agriculture zone of the Aral Sea region of Kazakhstan. The rice culture is hygrophytic and requires a large amount of irrigation water as well as a washing irrigation regime, which contributes to the leaching of salts from rice paddies. In the rice crop rotation, an active process of salt accumulation in the soil occurs after the rice stage. This happens because of the secondary soil salinization. The aim of the research was to study the salt tolerance and soil desalting properties of the new varieties of melilot during cultivation in the rice crop rotation in the irrigated area of the Aral Sea region of Kazakhstan. The research conducted in the Research and Development Center for the Microbiology and Virology showed that the cultivation of the “Arkas” variety of white melilot and the “Saraichik” variety of dentated melilot on saline soils in the rice crop rotation in the Aral Sea region of Kazakhstan leads to the soil desalination. According to the results of the research, the content of salt solid residue in the arable layer (0–30 cm) was lower under the “Saraichik” variety of dentated melilot than under the “Arkas” variety of white melilot. The level of groundwater rises and the process of salinization intensifies during the cultivation of crops. The transition from subsaline soils to the soils with a high degree of salinization occurs. The rates of development and growth are slow during the first year in melilot varieties; however, despite the low indicator values, the harvest results in a single mowing were high (229–309 kg/ha of herbage and 57.2–74.3 c/ha of hay). The “Saraichik” variety has large leaves, branching stems and high foliage. The “Saraichik” dentated melilot has a beneficial feature. This variety is able to use groundwater with high salt content more efficiently for its growth and development. It should be noted that the melilot yield of the first year was harvested in the region without irrigation, and it grew using the moisture reserve accumulated in the soil during the previous year from the watering of the previous culture, i.e. rice. Therefore, the results of the study demonstrated that “Arkas” white melilot and “Saraichik” dentated melilot are promising cultures that can be introduced into the rice crop rotation in the areas with saline soils in rice field systems of the Aral Sea region of Kazakhstan.
EN
An agroanalysis was carried out, which showed that there is a natural connection between the gross content of nutrients and their mobile nitrogen compounds in the soil. A comparison of the content of gross and mobile forms of phosphorus in the soil showed that in ordinary chernozems the content of gross forms of phosphorus is 0.11–0.13%. The content of gross potassium in soils varies between 1.7–2.4% and the content of mobile from medium to very high degree of security. The study area in terms of the organic matter content of carbon has a rate of 0.9–3.2% (compared to background soils – 3.12%). The results of the research will serve as a starting point for substantiating the alleged contaminated agricultural land, which will contribute to the constant monitoring of areas, the basis of which is to control the condition of the soil cover of agricultural land.
EN
Volcanic eruptions cause large-scale damage and leave piles of volcanic material that destroy plants, agricultural lands, animals, and soil microorganisms, decreasing soil fertility. Therefore, it is necessary to accelerate soil fertility recovery in post-volcanic eruption areas to resume agricultural activities. This study aims to elucidate the effect of volcanic deposits on soil fertility as well as explore tolerant plants and bacteria after Mt Semeru eruption. Soil, volcanic ash, and plant samples were collected from Pronojiwo Sub-regency, Lumajang Regency, East Java, Indonesia. Soil and volcanic ash chemical properties were analyzed (pH, available and total phosphorus (P), potassium (K), magnesium (Mg), and calcium (Ca) content). Bacteria were isolated and enumerated, then tested for P solubilization (PSB). The result showed that 3 months after Mt Semeru’s eruption, the first succession was fern, moss, and fungi. Some local plants (banana and coconut) emerge new shoots and recover. A high total P (137.32 mg/kg) with neutral pH 6.8 was found in the volcanic ash. Total P and available P were higher at the closest distance from the crater, and soil pH controlled P availability in the soil covered with volcanic deposits. Also, the thickness and distance from the crater strongly affect organic C, which reduces the PSB population from 103 to 104 CFU/g, compared to unaffected areas. The bacteria exhibited P solubilization activities even under harsh environmental conditions. Thus, accelerating soil fertility restoration by adding organic materials and inoculating beneficial bacteria (such as PSB) in the post-eruption area is essential as the bacteria benefit both soil fertility recovery and agriculture sustainability in degraded lands (e.g., post-eruption).
EN
The competitiveness of sugar beet in the Doukkala irrigated perimeter makes this crop the main one compared to wheat, vegetables and forage. However, the dominance of small plots drives farmers to practice 2 to 3 years rotation of sugar beet. This work, carried out on contrasting and representative soils between 2012 and 2019, aims to study the effects of sugar beet residues incorporation on the soil organic matter, soil properties, and sugar beet root yield and sugar content under reel field conditions and actual rotation system. The results showed that the rate of soil organic matter (SOM) increased by +28.8% during eight agricultural seasons. Plots that never received crops residues experienced an average decrease in SOM rate of -19%. The maximum average increase in the SOM rate of +194% was observed at the level of the plots, where sugar beet residues were incorporated six times. This variation in SOM is more marked in coarse-textured soils. The variations of Mg, K, P, Ca, Zn, B, CaCO3, soil pH, CEC are positively correlated with statistical significance with SOM variation. The multiple linear regression model for predicting the variation in SOM content, depending on soil texture, initial SOM content and number of residue incorporations, with (R2 = 0.81, RMSE = 26.15) shows that this variation is significantly favored by coarse soil elements and the number of residues incorporation and that it is unfavorable in soils with a dominant fine texture and initially rich in organic matter. Yield and sugar content were improved by 31% (67,45 Mg·ha-1 in 2012 and 86,38 Mg·ha-1 in 2019) for root yield and by 4% (16.68% in 2012 and 17,37% in 2019) for sugar content in plots with six residues incorporations. Data from this study suggest that the use of sugar beet residues is benefical for improving soil properties and thus increasing soil organic status and crop performances.
EN
Landslides determine increases and decreases in specific soil compounds which is affecting soil fertility. The recovery of soil fertility is a long process and may be used as an indicator of the landslide age and can contribute to the management plan of the affected area. In order to add to data about soil properties affected by landslides, the current study focuses on a young and shallow landslide from the western part of the Transylvanian Depression. Soil samples were analysed from a physico-chemical point of view (pH, organic matter - OM, total organic carbon - TOC, major cations, and iron content) in two places, at between 0 and 60 cm depth (inside and outside the landslide). The results obtained showed lower values of pH inside the landslide, low values of TOC and rock fragments in both places studied (inside and outside the landslide) and no differences in soil texture between disturbed and undisturbed soil. The ammonium, magnesium and calcium content was higher outside the landslide, the sodium level was slightly higher outside the landslide, while the potassium concentration was higher inside the landslide. This study offers new data regarding recovery of soil fertility and highlights the importance of gaining knowledge on soil properties of relevance to future measures to increase the fertility of agricultural soils.
EN
The article provides an assessment of soil fertility indicators of agricultural lands in the northern forest-steppe of the Republic of Bashkortostan within the Iglinsky region (Russian Federation). The content of humus, mobile phosphorus, exchangeable potassium, the thickness of the humus horizon, granulometric composition, morphological properties and soil washout were studied. It was revealed that the soil-forming process occurs on rocks of different ages and genesis, such as diluvial carbonate and carbonate-free clays and heavy loams, limestone eluvium, sandstone eluvium and alluvial deposits, which determine the diversity of the soil cover. In the study area, water erosion processes are developing, influenced by anthropogenic and natural factors such as planar and linear washout on slopes with a steepness of more than 2-3° and high ploughing of agricultural land. In terms of humus content, low-humus and medium-humus soils are widespread, accounting for 45.5 and 40%, respectively. The soil map was corrected and digitised to identify the main types and subtypes of soils, indicating the varieties at a scale of 1: 25,000. Digitised maps, taking into account the current state of soil fertility, are used to develop projects for inter-farm and intra-farm land management of organisations of the agro-industrial complex, state cadastral valuation of agricultural land, determination of land tax and development of measures to improve soil fertility.
EN
In Morocco, and particularly in the Doukkala irrigated perimeter, sugar beet rot caused by Sclerotium rolfsii is a major limiting factor for the productivity of this crop. The objective of this study was to identify the relationship between the frequency of Sclerotium rolfsii infestation and the quantity of viable sclerotia in the soil on the one hand, and with the different physicochemical parameters of the soil in cropped sugar beet fields on the other hand. In total, 1794 soil samples were collected during a four years period in the whole irrigated perimeter. These samples were analyzed for their sclerotial content. In addition, laboratory analysis of physico-chemical parameters was performed for 94 sugar beet fields in 2019. The study showed that the relative frequency of infestation by Sclerotium rolfsii and the number of viable sclerotia oscillate inversely and present a relative frequency of 45.7, 57.3, 42.3 and 49.5% for 2016, 2017, 2018, and 2019, respectively, and a number of sclerotia of 2.01, 1.65, 2.11 and 1.25 in 250 g of soil for 2016, 2017, 2018 and 2019, respectively. The study showed that the number of viable sclerotia was positively correlated with clay and silt content, soil pH, Mg, K, Fe, Cu, and Mn and negatively correlated with sand, SOM, EC, CaCO3, Zn, B, Ca, NH4 and NO3 contents. The observed decrease in viable sclerotia between 2016 and 2019 can be attributed to the decrease of Fe and Cu in the soil. It is possible that SOM intervenes with its humified fraction in the neutralization of the redox potential of Feand Cu which are involved in the production of sclerotia under oxidative stress. The good control of fertilization, especially organic, allows limiting the production of sclerotia of Sclerotium rolfsii. Data analysis allowed obtaining a significant prediction model of the number of viable sclerotia in the soil according to the physicochemical soil parameters with (R2 = 0.95 at P<0.0001) for only infested fields and (R2 = 0.87 at P<0.0001) for all the fields.
PL
Dokonano oceny plonowania i składu chemicznego pszenicy ozimej i jarej oraz niektórych wskaźników żyzności gleby po zastosowaniu gnojowicy od trzody chlewnej (fermentowanej bez dodatku i z dodatkiem preparatu PRP Fix) i po doglebowym stosowaniu nawozu PRP Sol. Stwierdzono zróżnicowany wpływ zastosowanych czynników na wielkość plonu ziarna i słomy pszenicy ozimej i jarej, ich skład chemiczny oraz na niektóre wskaźniki żyzności gleby.
EN
Soil was fertilized with liq. pig manure and used for growing winter and spring wheat in field expts. The fertilization resulted in improving the soil quality and increasing the grain and straw yield. An increase in K and N contents in grain and in straw as well as in S content in straw was obsd.
EN
Research carried out in the Western Beskid Mountains (Silesian Beskid, Beskid Mały and Beskid Żywiecki Mts) attempted to characterise the enzymatic activity of soils in various forest sites and associations. Twenty study plots were established to represent a range of sites and associations of the lower and upper mountain forest zones. The soils were analysed for the activity of dehydrogenases and phosphatases. Enzymatic activity was compared in the top soil (humus-accumulating mineral horizons) and soil columns of 1 dm² cross-section and 50 cm in depth. It was found that the activity of the studied enzymes, especially dehydrogenases, varied between the soils, suggesting that soils from different types of sites or associations have different microbiological activities. The results of the research contribute to the development of microbiological activity patterns for near-natural mountain forest sites and associations. Based on such patterns it would be possible to assess deterioration changes occurring in forest soils.
PL
W pracy scharakteryzowano aktywność dehydrogenaz i fosfataz w glebach zróżnicowanych typów siedliskowych lasu oraz zespołów leśnych Beskidów Zachodnich. Aktywność badanych enzymów porównywano w analogicznych poziomach genetycznych gleb, jak również wyrażano ją jako aktywność sumaryczną w profilu glebowym. Stwierdzono, że aktywność badanych enzymów, a zwłaszcza dehydrogenaz różnicuje typy siedlisk i naturalne zbiorowiska roślinne, co stanowi świadectwo odmiennej aktywności mikrobiologicznej zajmowanych przez nie gleb.
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