scholarly journals Effets combinés du biocharbon et du fumier sur les propriétés physico-chimiques d’un sol ferrugineux tropical sous culture de mil en zone semi-aride du Burkina Faso

2021 ◽  
Vol 157 ◽  
pp. 16172-16181
Author(s):  
Désiré Jean Pascal Lompo ◽  
Lambiénou Yé ◽  
Abdoudramane Balboné ◽  
Siélé Ibrahima Sori
Keyword(s):  
Carbon Sequestration ◽  
Soil Fertility ◽  
Burkina Faso ◽  
Crop Production ◽  
Crop Residues ◽  
Crop Yields ◽  
Arid Zone ◽  
Chemical Properties ◽  
Chemical Parameters ◽  
Soil Chemical Parameters

Objectifs : L’une des contraintes majeures des systèmes de production agricole au Burkina Faso demeure la dégradation des sols. La présente étude menée à Kongoussi (Burkina Faso) avait pour objectif de déterminer les effets du Biocharbon utilisé comme amendement sur le sol et les paramètres agronomiques du mil. Méthodologie et résultats : Un dispositif en blocs simple comportant 3 traitements en 5 répétitions a été utilisé. Les traitements comprenaient T0= Fumier + NPK, T1= Biocharbon + Fumier + NPK, T2= Biocharbon + NPK. Les matières fertilisantes ont induit une amélioration des paramètres chimiques du sol. Les meilleurs paramètres chimiques du sol ont été observés avec T1 (Biocharbon + Fumier + NPK) qui a permis l’obtention du plus grand rendement grains du mil comparativement à ceux obtenus avec les traitements T0 (Fumier + NPK) et T2 (Biocharbon + NPK) qui étaient statistiquement équivalents. Conclusions and application des résultats : La combinaison du biocharbon au fumier améliore la fertilité du sol et le rendement du mil. Cela constitue une solution intéressante en vue restaurer et ou maintenir la fertilité des sols, accroitre les rendements des cultures tout en réduisant les effets néfastes des changements climatiques à travers la séquestration du carbone dans le sol. La technologie du Biocharbon constitue une alternative intéressante pour la valorisation des résidus culturaux peu ou pas exploités pour améliorer durablement la qualité des sols et assurer la sécurité alimentaire tout en protégeant l’environnement. Mots-clés : fertilité des sols ; Biocharbon ; amendement organique ; séquestration du carbone, ABSTRACT Combined effects of biocharbon and manure on physico-chemical properties of a tropical ferruginous soil under millet cultivation in the semi-arid zone of Burkina Faso Objectives: One of the major constraints of agricultural production systems in Burkina Faso is the low soil fertility. The objective of this study conducted in Kongoussi (Burkina Faso) was to determine the effects of Biochar used as soil amendment in combination with manure on soil fertility and some agronomic parameters of millet. Methodology and results: A simple block disign with 3 treatments in 5 replicates was used. The randomly distributed treatments included T0= Manure + NPK, T1= Biochar + Manure + NPK, T2= Biochar + NPK. The Lompo et al., J. Appl. Biosci. 2021 Effets combinés du biocharbon et du fumier sur les propriétés physico-chimiques d’un sol ferrugineux tropical sous culture de mil en zone semi-aride du Burkina Faso. 16173 applied fertilizers improved some soil chemical parameters. The best soil chemical parameters were observed with T1 (Biochar + Manure + NPK), which induced the highest millet grain yield as compared to those obtained with T0 (Manure + NPK) and T2 (Biochar + NPK), which were statistically equivalent. Conclusions and application of findings : The combination of biochar with manure improves soil fertility and millet yield. This is an interesting solution to restore and/or maintain soil fertility, to increase crop yields while reducing the adverse effects of climate change through carbon sequestration into the soil. The Biochar technology is an interesting alternative for the valorization of crop residues little or not well exploited in order to sustainably improve soil quality and food security while protecting the environment. Keywords: Crop production ; Soil fertility ; Biochar ; organic amendment, carbon sequestration.

scholarly journals Analysis of Crop Production Constraints Through Participatory Rural Appraisal in Harari Region, Eastern Ethiopia; Implications for Research and Development

2019 ◽  
pp. 209-217
Author(s):  
Alemayehu Biri ◽  
Kibret Ketema ◽  
Solomon Ayele ◽  
Dagnachew Lule
Keyword(s):  
Soil Fertility ◽  
Crop Production ◽  
Management Practices ◽  
Crop Residues ◽  
Crop Yields ◽  
Farmyard Manure ◽  
Ammonium Phosphate ◽  
Mineral Fertilizers ◽  
Continuous Cropping ◽  
Eastern Ethiopia

Participatory rural appraisals (PRA) were conducted in July 14 to 30, 2016 in AGP-II project target districts: Erar waldiya and Dire Teyara in Harari region of Ethiopia. PRA exercises were conducted using various PRA tools which included review of secondary data, focus group discussions, field observations (Transact walk) and pair-wise ranking. The tools were used to identify the biophysical and socio-economic constraints, opportunities and developments within the kebeles. Agricultural and animal productions are common in the surveyed Kebeles of the AGP-II target districts. Mixed farming is widely practiced in the kebeles of both districts. Staple food crops like maize and sorghum, and cash crops like vegetables and khat (Catha edulis Forsk) are commonly produced across all targets of AGP-II districts and also as region as well. Growing maize and sorghum in khat alleys is another cropping system practiced in both districts. The PRA work has also identified various categories of constraints to increasing crop production in the areas. The major bottlenecks include lack of improved crop varieties, low soil fertility, deforestation, moisture stress, disease and insect pests, and lack of awareness on soil fertility crop management. In most of the PRA Kebeles, it was found that continuous cropping, complete removal of crop residues from farm lands, soil erosion, deforestation, absence of fallowing, and inadequate soil fertility management practices are the major causes for low soil fertility and crop yields. In most cases, farmers apply Di-ammonium phosphate (DAP), urea and farmyard manure to improve soil fertility and crop yield. However, very few farmers use integrated application of chemical fertilizers and farmyard manure for crop production. In addition, no scientifically formulated and recommended fertilizer rates are available for the specific soils and environments. Thus, due to the lack of scientifically recommended rates of fertilizers and high costs of mineral fertilizers, farmers often use smaller rates of mineral N and P fertilizers based on haphazard estimations.

Plantation Agriculture in the Tropics

2005 ◽  
Vol 34 (1) ◽  
pp. 11-21 ◽  
Author(s):  
Alfred E. Hartemink
Keyword(s):  
Carbon Sequestration ◽  
Soil Erosion ◽  
Soil Fertility ◽  
Cover Crops ◽  
Fertility Decline ◽  
Crop Yields ◽  
Perennial Crops ◽  
Tropical Countries ◽  
Plantation Agriculture ◽  
National Economies

Plantation agriculture is more than 400 years old and contributes to the regional and national economies in many tropical countries. This paper reviews some of the main environmental issues related to plantation agriculture with perennial crops, including soil erosion, soil fertility decline, pollution, carbon sequestration and biodiversity. Soil erosion and soil fertility decline are of concern in some areas, but in most plantations these are being checked by cover crops and inorganic fertilizer applications. Few studies have been conducted on the issue of carbon sequestration under perennial plantation cropping. Reductions in deforestation yield much greater benefits for a reduction in CO2 emissions than expanding plantation agriculture. The biggest threat to biodiversity is the loss of habitat through expansion of the plantation area. Despite the environmental problems and concerns, this review has shown that crop yields of most perennial crops have increased over time due to improved crop husbandry including high-yielding cultivars and improved soil management. It is likely that more attention will be given to the environmental aspects of plantation cropping due to the increasing environmental awareness in tropical countries.

scholarly journals Crop Residue Management for Sustenance of Natural Resources and Agriculture Productivity

2019 ◽  
Vol 40 (03) ◽  
Author(s):  
Maninder Singh ◽  
Anita Jaswal ◽  
Arshdeep Singh
Keyword(s):  
Organic Matter ◽  
Environmental Impacts ◽  
Crop Production ◽  
Crop Residue ◽  
Crop Residues ◽  
Crop Yields ◽  
Soil Surface ◽  
Residue Management ◽  
Soil Productivity ◽  
Crop Residue Management

Crop residue management (CRM) through conservation agriculture can improve soil productivity and crop production by preserving soil organic matter (SOM) levels. Two major benefits of surface-residue management are improved organic matter (OM) near the soil surface and boosted nutrient cycling and preservation. Larger microbial biomass and activity near the soil surface act as a pool for nutrients desirable in crop production and enhance structural stability for increased infiltration. In addition to the altered nutrient distribution within the soil profile, changes also occur in the chemical and physical properties of the soil. Improved soil C sequestration through enhanced CRM is a cost-effective option for reducing agriculture's impact on the environment. Ideally, CRM practices should be selected to optimize crop yields with negligible adverse effects on the environment. Crop residues of common agricultural crops are chief resources, not only as sources of nutrients for subsequent crops but also for amended soil, water and air quality. Maintaining and managing crop residues in agriculture can be economically beneficial to many producers and more importantly to society. Improved residue management and reduced tillage practices should be encouraged because of their beneficial role in reducing soil degradation and increasing soil productivity. Thus, farmers have a responsibility in making management decisions that will enable them to optimize crop yields and minimize environmental impacts. Multi-disciplinary and integrated efforts by a wide variety of scientists are required to design the best site-specific systems for CRM practices to enhance agricultural productivity and sustainability while minimizing environmental impacts.

scholarly journals The The response of soil physicochemical properties to tillage and soil fertility resources in Central Highlands of Kenya

2020 ◽  
Vol 15 (2) ◽  
Author(s):  
Milka N. Kiboi ◽  
Felix K. Ngetich ◽  
Anne Muriuki ◽  
Noah Adamtey ◽  
Daniel Mugendi
Keyword(s):  
Soil Fertility ◽  
Crop Residues ◽  
Chemical Properties ◽  
Aggregate Stability ◽  
Mineral Fertilizer ◽  
Soil Disturbance ◽  
Tithonia Diversifolia ◽  
Mineral N ◽  
Total N ◽  
Central Highlands

To attain agricultural sustainability, use of soil resources and tillage requires equal consideration for chemical and physical components of soil fertility. We assessed responses of selected soil physical and chemical properties to tillage and soil fertility amending resources. The study was carried out in Meru South and Kandara sub-counties located in the Central Highlands of Kenya for four cropping seasons. The experimental design was split-plot with tillage as the main factor - conventional (D15) - and minimum (D0) tillage and soil fertility resources (SFR) as sub-factors - mineral fertilizer (F), crop residues + fertilizer (RF), residues + fertilizer + animal manure (RFM), residues + Tithonia diversifolia + manure (RTiM), residues + Tithonia diversifolia + phosphate rock (Minjingu) (RTiP), residues + manure + legume intercrop (RML) and control (no input). Compared with control, aggregate stability was significantly higher on average under SFRs with sole organics by 19% in Meru South. Total N and available P were higher under integration of fertilizer and organics in both sites. Calcium increased under sole organic or integration with fertilizer in Meru South and under sole organics in Kandara. Magnesium significantly increased under all SFRs compared with control in Kandara. Soil organic carbon significantly (P=0.02) increased under D0 by 6% compared to D15 in 0-5 cm depth in Kandara. Application of RTiM had the highest SOC in all depths’ at Meru South. SOC significantly increased under RTiP and RML by 11% in 0-5 cm depth and under RML by 13% in 5-10 cm depth at Kandara. Mineral-N (NO3–-N and NH4+-N) was higher under D0 at planting compared with D15 in Meru South. In Kandara, NO3–-N and NH4+-N were significantly higher by 17% and 30%, respectively under D0 compared with D15 at planting during SR16 season. Higher mineral N was recorded under F application on the 30th and 45th days in both sites. The highest mineral-N content was on the 45th day after planting during SR16 season and on the 30th day during LR17 season at Meru South. In Kandara, NO3–-N and NH4+-N were highest on the 45th day and 30th day, respectively, during SR16 season. During LR17 season, mineral-N was highest on the 30th day in Kandara. The study highlights that minimal soil disturbance and organic inputs use or integration with fertilizers are feasible alternatives for improving soil fertility in the Nitisols of Central Highlands of Kenya.

scholarly journals Spatial and temporal variability of crop yield and some Rhodic Hapludox properties under no-tillage

2010 ◽  
Vol 34 (1) ◽  
pp. 1-14 ◽  
Author(s):  
Osvaldo Guedes Filho ◽  
Sidney Rosa Vieira ◽  
Márcio Koiti Chiba ◽  
César Hideo Nagumo ◽  
Sônia Carmela Falci Dechen
Keyword(s):  
Physical Properties ◽  
Soil Properties ◽  
Crop Yield ◽  
Crop Production ◽  
Crop Yields ◽  
Chemical Properties ◽  
Temporal Variations ◽  
Northern Region ◽  
Spatial And Temporal Variability ◽  
No Tillage

Soil properties are closely related with crop production and spite of the measures implemented, spatial variation has been repeatedly observed and described. Identifying and describing spatial variations of soil properties and their effects on crop yield can be a powerful decision-making tool in specific land management systems. The objective of this research was to characterize the spatial and temporal variations in crop yield and chemical and physical properties of a Rhodic Hapludox soil under no-tillage. The studied area of 3.42 ha had been cultivated since 1985 under no-tillage crop rotation in summer and winter. Yield and soil property were sampled in a regular 10 x 10 m grid, with 302 sample points. Yields of several crops were analyzed (soybean, maize, triticale, hyacinth bean and castor bean) as well as soil chemical (pH, Soil Organic Matter (SOM), P, Ca2+, Mg2+, H + Al, B, Fe, Mn, Zn, CEC, sum of bases (SB), and base saturation (V %)) and soil physical properties (saturated hydraulic conductivity, texture, density, total porosity, and mechanical penetration resistance). Data were analyzed using geostatistical analysis procedures and maps based on interpolation by kriging. Great variation in crop yields was observed in the years evaluated. The yield values in the Northern region of the study area were high in some years. Crop yields and some physical and soil chemical properties were spatially correlated.

scholarly journals Effect of Continuous Intensive Cultivation on the Chemical and Microbiological Properties of Oxic Dystrandept Soils in the Western Highlands of Cameroon

2021 ◽  
Vol 9 (1) ◽  
pp. 17-26
Author(s):  
NTANGMO TSAFACK Honorine ◽  
Keyword(s):  
Soil Fertility ◽  
Crop Production ◽  
Cropping Systems ◽  
Management Strategies ◽  
Chemical Properties ◽  
Available Phosphorus ◽  
First Year ◽  
Soil Productivity ◽  
One Year ◽  
Microbiological Properties

Soil fertility indices are well documented as they are directly related to land use and productivity. However, the effect of continuous intensive cultivation on the evolution of soil fertility is still poorly documented. The aim of this study was thus to assess the effect of continuous intensive cultivation on the chemical and microbiological properties of Oxic Dystrandept soils in the Western Highlands of Cameroon. Composite soil samples were taken between 0-15 cm depths on farmlands that have been subjected to continuous intensive cultivation for one, five and ten years meanwhile samples from plots that have never been cultivated served as control. The main results revealed that the ammonium contents dropped abruptly (86%-wt) from the first year of cultivation. The organic carbon (OC) content decreased from 1.81 ± 0.14 %-dm (in control) to 1.69 ± 0.09 % after one year, 1.66 ± 0.10 % after 5 years and 1.58 ± 0.07 % after 10 years. Compared to the control, available phosphorus (P) showed a 13 %-wt drop after one year, 46 % after 5 years and 85 % after 10 years. Dehydrogenase activity showed a 42 % decrease after one year, 50 % after five years and 73 % after 10 years. The other parameters were not significantly different (P<0.05) amongst treatments. Decline of soil productivity was undoubtedly related to the decrease of OC, P, microbial activity and ammonium with continuous intensive cultivation. Thus, management strategies for improved crop production should include selection suitable cropping systems and chemical methods. Keywords: Continuous intensive cultivation, enzymatic activities, soil chemical properties, Oxic Dystrandept, Cameroon western highland

scholarly journals Analyse des pratiques d’embouche ovine dans deux zones semi-arides du Burkina Faso

2020 ◽  
Vol 150 ◽  
pp. 15390-15402
Author(s):  
Sanon Hadja Oumou ◽  
Zorma Antoine ◽  
Simian Aziz ◽  
Obulbiga M. Ferdinand ◽  
Compaoré Emmanuel
Keyword(s):  
Burkina Faso ◽  
Crop Production ◽  
Arid Zone ◽  
Production Capacity ◽  
Snowball Sampling ◽  
Dual Purpose ◽  
Group 2 ◽  
Meat Productivity ◽  
The Cost ◽  
Group 1

Objectif : Pour améliorer la productivité du bétail et de la viande et accroitre le revenu des producteurs, la promotion des activités d’embouche est encouragée et soutenu par différents acteurs au développement. Cependant, la maitrise de l’activité par les producteurs en milieu paysan est faiblement documentée. Méthodologie et résultats : Cette étude a été conduite dans la zone semi-aride du Burkina Faso avec pour objectif d’analyser les pratiques d’embouche des producteurs et d’apprécier leur capacité de production. Elle a consisté en des enquêtes formelles auprès des emboucheurs de huit villages dont quatre dans la zone de Ouahigouya (province du Yatenga) et quatre dans la zone de Dori (province du Seno). Les données ont été collectées auprès de 197 producteurs choisis suivant un échantillonnage en boule de neige. Les résultats montrent deux groupes d’emboucheurs : le premier est dominé par les emboucheurs de la zone de Ouahigouya et le deuxième par ceux de la zone de Dori. Les emboucheurs du groupe 1 ont un âge plus avancé (54 % plus de 50 ans), que ceux du groupe 2 où près de 77 % ont moins de 50 ans. Dans le premier groupe le niveau d’instruction est relativement plus élevé, avec 40 % scolarisés contre 73 % d’illettrés pour le groupe 2. Le nombre d’ovins et de bovins embouchés est plus élevé au niveau du groupe 1 avec en moyenne 8,4 et 3,2 respectivement contre 3,8 et 2,3 pour le groupe 2. Les fosses fumières sont fréquentes dans le groupe 1 où 63% en possèdent. Conclusion et application des résultats : En conclusion, l’étude montre un faible niveau technique des emboucheurs ainsi que leur faible capacité de production, plus marqué dans la zone de Dori. Ces résultats permettent de guider les interventions dans le domaine de l’embouche, notamment de cibler les actions suivant les sites. Dans ces démarches un accent particulier devra être mis sur les cultures à double objectif afin d’améliorer l’alimentation et réduire le cout de production, tout en favorisant l’intégration agricultureélevage. Mots clés : Embouche, ovin, alimentation, capacité de production, Dori, Ouahigouya Sanon et al., J. Appl. Biosci. 2020 Analyse des pratiques d’embouche ovine dans deux zones semi-arides du Burkina Faso 15391 ABSTRACT Analysis of sheep fattening practices in two semiarid zones of Burkina Faso Objective: To improve animal and meat productivity and increase the revenue for farmers the promotion of fattening activities is encouraged and supported by many development actors. However, the knowledge of this activity by farmers in rural area is poorly documented. Methodology and results: This study was conducted in the semi-arid zone of Burkina Faso in order to analyse the fattening practices of farmers and assess their production capacity. It consisted of formal surveys of farmers in eight villages, four of which were in the Ouahigouya area (Yatenga province) and four in the Dori area (Seno province). The data were collected from 197 farmers chosen according to a snowball sampling. The results show two groups of farmers: fatteners from the Ouahigouya area and the second dominate the first by those from the Dori area. The fatteners in group 1 are older (54% over 50 years) than those in group 2 where almost 77% are under 50 years old. In the first group, the level of education is relatively higher, with 40% educated against 73% illiterate for group 2. The number of sheep and cattle fattened is higher in group 1 with on average 8.4 and 3.2 respectively against 3.8 and 2.3 for group 2. Manure pits are frequent in group 1 where 63% have them. Conclusion and application of results: This survey reveals low technical level of the farmers as well as their low production capacity, particularly in the Dori area. These results could guide interventions on fattening field particularly to target actions according to the sites. They should involve dual-purpose crop production in order to improve nutrition and reduce the cost of production, while promoting the integration of crop and livestock. Key words: fattening, sheep, feeding, production capacity, Dori, Ouahigouya

scholarly journals Evaluation of the effect of maize-legume intercropping on soil moisture improvement in arid area of Bena-Tsemay district, South omo zone, Southern Ethiopia

2020 ◽  
Vol 10 (1) ◽  
pp. 80-86
Author(s):  
HM Ayele
Keyword(s):  
Soil Moisture ◽  
Crop Yield ◽  
Crop Residues ◽  
Crop Yields ◽  
Nutrient Balance ◽  
Chemical Properties ◽  
Soil Nutrient ◽  
Moisture Stress ◽  
Southern Ethiopia ◽  
Crop Failure

Usually crop failure due to moisture shortage in soils is very much common due to high evaporation. Sometimes famers try to combat this problem by using mulches of crop residues in the study area. However, this is also highly challenged shortage because the crop residues used as feed for animals. Therefore, using the advantage and opportunity of cover legumes as an intercrop is the solution of the problems simultaneously in addition to their contribution improving soil nutrient balance and other many fold benefits. Therefore, this study aimed for evaluating the effect of maize-legume covers intercropping on soil moisture improvement and crop yield in moisture stress areas of the study area. The entire grain yield of maize and legumes, as well as soil moisture data were collected. The result on soil moisture revealed that intercropping of maize with cowpea had better soil moisture contents during active crop development (15.98%) and after harvest (16.70%) in average as compared to the others. The current finding also showed that adopting intercropping of maize with cowpea-boosted yield by 5256.24 kg ha-1 maize and 977.45 kg ha-1 cowpea in average with higher moisture improvement as compare to the other treatments. Therefore, intercropping of maize with cowpea is important to farmers since it would provide additional crop yield with the same piece of land. However, to get considerable changes on soil and water balances, other soil physic-chemical properties and crop yields, conducting similar studies in more than two years period at permanent field plots is paramount in the future. Int. J. Agril. Res. Innov. Tech. 10(1): 80-86, June 2020

Titonia Utilization and The Rest Of Soybean Harvest In The Alternative As Fertilizer Ultisol Fertility Improvement And Soybean Crop Production

2017 ◽  
Vol 1 (2) ◽  
pp. 18
Author(s):  
Yadi Jufri, Syafrimen Yasin, Agustian, Teguh Budi Prasetyo, Nurhajati Hakim
Keyword(s):  
Soil Fertility ◽  
Soil Ph ◽  
Crop Production ◽  
Crop Residues ◽  
Ph Value ◽  
Laboratory Analysis ◽  
Random Design ◽  
Soybean Crop ◽  
Highest Weight ◽  
Soybean Straw

Utilization Titonia and soybean crop residues (straw soybean) as compost, is onealternative fertilizer to improve soil fertility Ultisol. This study aimed to determinethe effect of a mixture of compost and straw Titonia soy, lime and fertilizers inimproving soil fertility and soybean crop production. The research was conductedat experimental field LimauManis and laboratory analysis conducted at theLaboratory P3IN Andalas University, Padang. Research using Random Design(RBD), which consists of 10 treatments with 3 replications were tested. The resultsshowed that administration of lime, compost and fertilizers give effect to thechemical characteristics Ultisol namely against soil pH value, the content of N, Pand K soil. The provision of artificial fertilizers as much as 50% of the soybeancrop needs, provide higher impact than that of artificial fertilizers as much as 25%of the increase in soil fertility and the growth and production of soybean plants.Production of dry seeds of soybean highest weight obtained amounted to 1.85 tons /ha in the treatment of lime dolomite 500 kg / ha + compost mixture (5 tonsTitonia/ha with 5 tons of soybean straw/ha) + NK fertilizers by 50% of the soybeancrop needs (treatment G).

scholarly journals Carbon sequestration and its dynamics in water-stable aggregates

2014 ◽  
Vol 60 (1) ◽  
pp. 1-9 ◽  
Author(s):  
Vladimír Šimanský ◽  
Peter Kováčik
Keyword(s):  
Organic Matter ◽  
Carbon Sequestration ◽  
Crop Production ◽  
Management Practices ◽  
Crop Residues ◽  
Fine Fraction ◽  
Soil Management ◽  
Coarse Fraction ◽  
Water Stable Aggregates ◽  
Native Grassland

Abstract Sequestration of organic carbon in soils is an effective strategy to mitigate global climate change. Carbon sequestration leads to an increase in carbon stocks in soil, thereby reducing greenhouse gas emissions while improving soil quality and crop production. There are several published articles containing information in which the authors explain carbon sequestration in different soil types under different climatic conditions or farming systems, but on the other hand there is less information about carbon sequestration in water-stable aggregates. In field experiment, the manner in which different soil management practices influence carbon sequestration and its dynamics in water-stable aggregates was studied. We evaluated the soil samples taken from Haplic Luvisol (Dolná Malanta - Slovakia) from all treatments of tillage (conventional, minimal and grassland) and fertilisation (without fertilisation, crop residues together with NPK fertilisers and only NPK fertilisers). The maintenance of carbon concentration within soil under conventional tillage and in native grassland was due to an enhanced incorporation of new organic matter from the coarse fraction of particulate organic matter to macro-aggregates and in treatment with ploughed crop residue together with NPK fertilisers, there was besides of this caused by the reduction of carbon mineralisation from the fine fraction. Soil management practices have a significant effect on the re-distribution of soil organic matter in water-stable aggregates. In conventional and minimal tillage, very important sources of carbon sequestration are agronomical favourable size fractions of water-stable macro-aggregates and in native grassland, as well as in all fertiliser treatments, the most important source of carbon sequestration is water-stable micro-aggregates.

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