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Articles 4771 - 4800 of 14771
Full-Text Articles in Agricultural Science
Nitrate Leaching In The Meadows Of Western Lithuania With Different Liming And Fertilisation Levels, Ruta Butkute, N. Daugeliene
Nitrate Leaching In The Meadows Of Western Lithuania With Different Liming And Fertilisation Levels, Ruta Butkute, N. Daugeliene
IGC Proceedings (1977-2023)
Investigations of recent decades in the Baltic region including Lithuania showed that intensive liming and mineral fertilisation are the main factors achieving maximum crop yield. However, this farming method had a negative effect on soil quality and nutrient leaching became more intensive. Grassland fertilisation with nitrogen (N) helps plants to assimilate P, K, Ca, Na, but it may increase leaching of nutrients (Niczyporuk & Jankowska, 1995). Nitrate leaching is usually low from grasslands, primarily due to their long growing season compared to arable crops (Korsaeth et.al., 2003). The objective of this research was to determine the effect of liming …
Mechanical Aeration And Liquid Dairy Manure: Application Impacts On Grassland Runoff Water Quality And Yield, T. J. Basden, S. B. Shah, J. L. Miller
Mechanical Aeration And Liquid Dairy Manure: Application Impacts On Grassland Runoff Water Quality And Yield, T. J. Basden, S. B. Shah, J. L. Miller
IGC Proceedings (1977-2023)
Wet weather on heavy soils reduces oxygen availability in the root zone and reduces forage yields. Mechanical aeration can improve forage yield in these soil conditions. Research has shown that under certain conditions, mechanical aeration can increase yield by improving drainage and aeration (Davies et al., 1989); aeration can also increase depression, storage and infiltration thus reducing surface runoff and improving nutrient distribution in the root zone. Aeration on sloping, fertilised grassland can provide environmental (Douglas et al., 1995) and agronomic benefits. The objectives of this study were to evaluate the runoff water quality and agronomic impacts of …
The Effect Of Agricultural Practices On A Dairy Farm On Nitrate Leaching To 1m, M. Ryan, K. Mcnamara, D. Noonan, O. T. Carton, Caroline Brophy, John Connolly, E. Houtsma
The Effect Of Agricultural Practices On A Dairy Farm On Nitrate Leaching To 1m, M. Ryan, K. Mcnamara, D. Noonan, O. T. Carton, Caroline Brophy, John Connolly, E. Houtsma
IGC Proceedings (1977-2023)
Dairy farms, in Ireland, carry the highest stock densities and use the highest rates of fertiliser nitrogen (N). They constitute the highest risk of nitrate leaching, especially where soils are thin or free-draining. The effect of 4 grass managements on leaching was studied on a dairy farm having free-draining soils overlying Karst limestone. This was a new, farm-comprehensive approach to nitrate leaching which had not been carried out previously.
Agro-Ecological Effects Of Sewage Sludge Application To Orchard Grass (Dactylis Glomerata) Fields, G. E. Merzlaya, R. A. Afanasiev, M. E. Shibaeva, I. A. Arkhipchenko
Agro-Ecological Effects Of Sewage Sludge Application To Orchard Grass (Dactylis Glomerata) Fields, G. E. Merzlaya, R. A. Afanasiev, M. E. Shibaeva, I. A. Arkhipchenko
IGC Proceedings (1977-2023)
Municipal sewage sludge can have a great fertilisation effect. However, its application is limited by high amounts of heavy metals, which have adverse effects on soil biota and plants (Ladonin et al., 2002). Our work was aimed at investigating the sludge effect on a soil-plant system.
The Effect Of Steel Industrial Residue-Enriched Soil On The Initial Growth And Heavy Metal Profiles Of Elephantgrass, L. P. Passos, M. F. Saldanha, M. C. Vidigal, J. C. De Crignis, S. Sozzi, F. J. S. Lédo, R. C. Oliveira
The Effect Of Steel Industrial Residue-Enriched Soil On The Initial Growth And Heavy Metal Profiles Of Elephantgrass, L. P. Passos, M. F. Saldanha, M. C. Vidigal, J. C. De Crignis, S. Sozzi, F. J. S. Lédo, R. C. Oliveira
IGC Proceedings (1977-2023)
Heavy metal contamination of industrial sites are becoming a matter of growing concern. In spite of the substantial progress in the assessment of the influence of steel industrial plant waste on soil and water (Adamo et al., 2002), studies on the immediate responses of cultivated plants are still scarce. The objective of this experiment was to verify the short-term effects of soil added phosphate mud (P mud) or metallurgical scale (M scale), which are trace element-rich steel industry residues, on the initial uptake and heavy metal profiles of elephantgrass (Pennisetum purpureum)
Effect Of Adding Moraine Soil Or Shell Sand Into Peat Soil On Soil Properties And Grass Yields In Western Norway, L. S. Sognnes, G. Fystro, S. Øpstad
Effect Of Adding Moraine Soil Or Shell Sand Into Peat Soil On Soil Properties And Grass Yields In Western Norway, L. S. Sognnes, G. Fystro, S. Øpstad
IGC Proceedings (1977-2023)
Cultivation and utilisation of peat soil leads to problems related to its high water content. The problems have become more pronounced with the increasing weight of agricultural machinery and more frequent harvesting. Increased particle density, reduced porosity and decreased potential plant-available water was found after incorporation of sand to peat in experiments conducted in the north of Norway (Sveistrup & Haraldsen, 1995). Peat soil has a weak soil skeleton, low bearing capacity, poor thermal properties and insufficient soil aeration. The objective of this study was to investigate the impact of added mineral material to peat soil to improve characteristics important …
Pasture Production After Sewage Sludge And Liming Application On Highlands In North West Spain, M. L. Rigueiro-Rodríguez, A. López-Díaz, M. R. Mosquera-Losada
Pasture Production After Sewage Sludge And Liming Application On Highlands In North West Spain, M. L. Rigueiro-Rodríguez, A. López-Díaz, M. R. Mosquera-Losada
IGC Proceedings (1977-2023)
In recent years, a sewage sludge surplus has been created in the EU countries, due to the Urban Waste Water Treatment Directive 91/271/CEE. Therefore, it is necessary to find adequate disposal for these residues in accordance with EU policy. Organic matter and nutrient sewage sludge contain principally N, indicating that it could be used as fertiliser. The main risk of this residue is its heavy metal content, whose solubility is usually increased as soil pH declines. The objective of this experiment was to determine the effect of liming and sewage sludge application on pasture production in a silvopastoral system located …
Agronomic Characterisation Of Sewage Sludge: Residual Effects, M. R. Mosquera-Losada, A. Rigueiro-Rodríguez
Agronomic Characterisation Of Sewage Sludge: Residual Effects, M. R. Mosquera-Losada, A. Rigueiro-Rodríguez
IGC Proceedings (1977-2023)
The progressive implementation of the EU Urban Waste Water Treatment Directive 91/271/EEC is increasing the quantities of sewage sludge requiring disposal. Agronomic use of sewage sludge should be based on crop fertiliser requirements and heavy metals content. Sewage sludge fertiliser potential depends on the stabilisation treatments of sewage sludge: composting, anaerobic digestion, aerobic digestion or pelleting (EPA, 1994). The objective of this experiment was to evaluate the fertiliser effectiveness and residual effects of three types of sewage sludge treated in three different ways.
Increase In Forage Maize Production By Bacterial Fertilisers, D. Egamberdiyeva, G. Hoflich
Increase In Forage Maize Production By Bacterial Fertilisers, D. Egamberdiyeva, G. Hoflich
IGC Proceedings (1977-2023)
Farmers in many countries value green material generated from maize as a high quality forage. Its inclusion in dairy cow diets can improve forage intake, increase animal performance and has the potential to reduce production costs (Phipps, 1994). Restrictions on the use of chemical fertilisers and a renewed interest in organic sustainable farming systems in general, has restored attention to crop rotations The increase of maize production using bacterial fertilisers also gives alternative ways to reduce chemical fertilisers in forage production. Increased uptake of nutrients such as N, P, and K and crop yield was reported with rhizobacteria (Lazarovits & …
Soil Organic Matter Along A Degradation Gradient In A Semi-Arid Rangeland Of South Africa, Chris C. Du Preez, Hennie A. Snyman
Soil Organic Matter Along A Degradation Gradient In A Semi-Arid Rangeland Of South Africa, Chris C. Du Preez, Hennie A. Snyman
IGC Proceedings (1977-2023)
In a semi-arid South Africa rangeland on a sandy loam soil, artificial manipulations to create various rangeland conditions typical of different levels of livestock impact were shown to result in considerable losses of organic matter after 15 years (Du Preez & Snyman, 1993). In this follow-up study on a similar soil, we regularly measured the organic matter content following the conversion of rangeland in a good to a poor ecological condition, an undisturbed bare soil and a cultivated soil respectively. The changes in soil organic matter content after five years are reported.
Influence Of Grazing On Soil Microbial Communities On A Mixed Grass Prairie Ecosystem, L. J. Ingram, G. E. Schuman, P. D. Stahl, J. Buyer
Influence Of Grazing On Soil Microbial Communities On A Mixed Grass Prairie Ecosystem, L. J. Ingram, G. E. Schuman, P. D. Stahl, J. Buyer
IGC Proceedings (1977-2023)
The grazing of ungulates is the predominant use for much of the world's semiarid rangelands. Grazing these lands can result in significant changes not only in the vegetation community but also in the soil physical, chemical and biological properties. Changes in soil physical and chemical properties and the plant community can potentially lead to changes in soil microbial communities which may have long-term ramifications for nutrient cycling and carbon (C) sequestration. The objective of this research was to ascertain the influence of three long-term grazing treatments on soil microbial communities.
Soil Microbial Diversity Of An Artificial Caragana Korshinskii Plantation On The Loess Plateau Of China, W. Zhang, H. L. Wei, H. W. Gao, Y. G. Hu
Soil Microbial Diversity Of An Artificial Caragana Korshinskii Plantation On The Loess Plateau Of China, W. Zhang, H. L. Wei, H. W. Gao, Y. G. Hu
IGC Proceedings (1977-2023)
Peashrub (Caragana korshinskii) is an important dune-fixation plant on the loess plateau of China and is valuable in ecological environment construction of North-western China. For determining relationships between peashrub and soil microbes, three clone libraries of 16S rDNA from rhizoplane, rhizosphere and bulk soil communities of peashrub were constructed with a culture-independent approach. The data obtained from three clone libraries were used to investigate the magnitude of vegetative changes in the microbial community, and to search for general ecological relationships.
Soil Enzyme Activities As Bio Indicators Of Soil Ph And Fertility In Temperate Grassland, Iker Mijangos, A. Ibarra, Isabel Albizu, Sorkunde Mendarte, Carlos Garbisu
Soil Enzyme Activities As Bio Indicators Of Soil Ph And Fertility In Temperate Grassland, Iker Mijangos, A. Ibarra, Isabel Albizu, Sorkunde Mendarte, Carlos Garbisu
IGC Proceedings (1977-2023)
In recent years, biological indicators are being used to estimate the continued capacity of a given soil to function (i.e., soil health). After all, biological processes are intimately linked with the maintenance of soil structure and fertility, being more sensitive to changes in the soil than conventional physicochemical parameters. Soil enzymes, as mediators and catalysts of vital soil functions, offer great potential as integrative indicators of soil health (Dick et al., 1996). The main aim of the current work was to study the potential of soil enzyme activities as biological (more precisely, biochemical) indicators of soil physicochemical …
The Effect Of Nitrogen Fixation And Plant Species On Ammonium And Amino Acids Soil Contents, F. Lesuffleur, S. Diquélou, A. Bré, J. B. Cliquet
The Effect Of Nitrogen Fixation And Plant Species On Ammonium And Amino Acids Soil Contents, F. Lesuffleur, S. Diquélou, A. Bré, J. B. Cliquet
IGC Proceedings (1977-2023)
Grass and legume intercropping systems, particularly ryegrass-clover mixed cultures, increase grasslands productivity, due to the clover nitrogen (N) fixation and to the transfer of part it to the companion grass. The objective of this experiment was to determine if N fixation and plant species could modify ammonium and amino acids soil contents.
Soil Constraints (Ph And Aluminium) For Legume Performance In Hill Country Of Uruguay, Walter Ayala, R. E. Bermúdez
Soil Constraints (Ph And Aluminium) For Legume Performance In Hill Country Of Uruguay, Walter Ayala, R. E. Bermúdez
IGC Proceedings (1977-2023)
Pastoral areas in eastern Uruguay have soils with pH 5.5 or lower (Mas, 1978), which is frequently associated with the acid soil syndrome (Cregan, 1980). As pH drops below 5.5, aluminium (Al) concentration can increase to toxic levels. These conditions may adversely affect growth of introduced legumes. A way to overcome these constraints is by the use of tolerant species. The objective of this study was to evaluate the adaptation and productivity of different legumes under environments with restrictions in pH and Al concentrations.
Grazing Effects On Some Soil Characteristics In Lar Rangelands, S. A. Javadi, M. Jafari, Gh. Zahedi
Grazing Effects On Some Soil Characteristics In Lar Rangelands, S. A. Javadi, M. Jafari, Gh. Zahedi
IGC Proceedings (1977-2023)
Heavy grazing pressures jeopardise the sustainability of the ecosystem by reducing soil fertility (Dormaar et al., 1998). Different results have been reported of grazing intensities on soil chemical properties, which stem from climate, soil, vegetation, management and kind of animal (Dormaar et al., 1998; Javadi, 2003; Sanadgool, 2002).
Accumulation And Decomposition Rates And N, P And K Returned To The Soil By The Litter Of Tropical Legumes And Grasses, Gustavo Crespo, I. Rodríguez, M. F. Días, Sandra Lok
Accumulation And Decomposition Rates And N, P And K Returned To The Soil By The Litter Of Tropical Legumes And Grasses, Gustavo Crespo, I. Rodríguez, M. F. Días, Sandra Lok
IGC Proceedings (1977-2023)
The return of plant nutrients through litter decomposition of legumes and grasses is important for the sustainability of grassland ecosystems (Sánchez et al., 1989). Therefore, the selection of species that produce high amounts of decomposable litter is important . The objective of the present work was to study the production and decomposition rates of litter from various legumes and grasses in Cuba.
Effect Of Earthworm Manure Fertilisation On Biomass Production And Mineral Content Of Digitaria Swazilandensis, A. Paredes, S. Camacaro, W. Machado
Effect Of Earthworm Manure Fertilisation On Biomass Production And Mineral Content Of Digitaria Swazilandensis, A. Paredes, S. Camacaro, W. Machado
IGC Proceedings (1977-2023)
Chemical fertilisers are expensive and can cause environmental contamination, affecting the biodiversity; it is therefore desirable to use organic manure that is cheaper and can be prepared on the same farm. Earthworm manure is the product of worms that transform organic matter (Salinas & Rojas, 1995), which improves the physical, chemical and biological properties of the soil (Pérez, 1993; Ravera & De Sanso, 1999). The importance of these improvements justifies the use of the worm humus in fertilisation programs in grasslands. Therefore, the objective of this experiment was to evaluate the effect of the earthworm manure on the biomass production …
Fire And Nutrient Cycling In Shortgrass Steppe Of The Southern Great Plains, Usa, Paulette L. Ford, C. S. White
Fire And Nutrient Cycling In Shortgrass Steppe Of The Southern Great Plains, Usa, Paulette L. Ford, C. S. White
IGC Proceedings (1977-2023)
Fire in semi-arid grasslands releases nutrients bound up in organic matter and accelerates the rate of decomposition in the soil. This research experimentally tested effects of season and frequency of fire on nutrient cycling dynamics in shortgrass steppe. The objective was to identify if fire treatments have the ability to increase potential grassland productivity relative to untreated 'reference condition' grassland. Many such studies focus on short-term, direct effects of fire. However, this study is part of a long-term, 18-year study examining both direct, and indirect effects of fire in the growing vs. dormant season at return intervals of 3, 6 …
Soil Quality Under Permanent And Annual Pastures: Its Implications For Soil Microbial Activity And Nutrient Turnover, R. J. Haynes, R. M. Milne, N. Miles
Soil Quality Under Permanent And Annual Pastures: Its Implications For Soil Microbial Activity And Nutrient Turnover, R. J. Haynes, R. M. Milne, N. Miles
IGC Proceedings (1977-2023)
Dairy farming in humid, subtropical parts of South Africa is based on permanent kikuyu grass (Pennisetum clandestinum) swards. However, there is a shortage of feed during the winter because low temperatures limit kikuyu growth. As a result, annual pastures incorporating temperate grasses, are grown for winter feed production. The grasses used are typically annual ryegrass (Lolium multiflorum) and sometimes perennial ryegrass (Lolium perenne). Kikuyu is so invasive in the locality that it becomes dominant within a few years, even if the field is sown to perennial ryegrass. For that reason, the swards are usually …
Micro-Field Assessment Of Soil Erosion And Surface Runoff Using Mini Rainfall Simulator In Upper River Njoro Watershed In Kenya, J. O. Onyando, M. O. Okelo, C. M. Gichaba, W. A. Shivoga, S. N. Miller
Micro-Field Assessment Of Soil Erosion And Surface Runoff Using Mini Rainfall Simulator In Upper River Njoro Watershed In Kenya, J. O. Onyando, M. O. Okelo, C. M. Gichaba, W. A. Shivoga, S. N. Miller
IGC Proceedings (1977-2023)
Soil erosion and surface runoff are consequences of integration of several factors and processes within a catchment. The use of a rainfall simulator and run off plots provides a valuable research tool and are often used in soil erosion and surface runoff studies. Cheruiyot (1984) used this approach to study infiltration rates and sediment yield in Kiboko, Kenya. The present study used the same method but with a mini-rainfall simulator (Kamphorst, 1987) to study the effects of different land use treatments on soil loss and surface runoff.
Validation Of The Software “Recycling Of Nutrients” In Dairy-Farms Of Western Cuba, I. Rodríguez, Gustavo Crespo, M. F. Días, S. Fraga
Validation Of The Software “Recycling Of Nutrients” In Dairy-Farms Of Western Cuba, I. Rodríguez, Gustavo Crespo, M. F. Días, S. Fraga
IGC Proceedings (1977-2023)
To maintain a good productivity in the soil-plant-animal system it is necessary to achieve an equilibrium between input and output of nutrients and energy. Models and simulation software have been proposed for this purpose. For dairy farms, models have been utilised to show the behaviour of different aspects, such as: feed utilisation, energy flow, digestibility values and daily weight gains (Freer et al., 1970; Assis & France, 1983, Bruce et al., 1984). However, there are few models showing the interaction between soil-plant- animal components of these systems. The objective of the present study was to validate the software …
Modelling Urine Nitrogen Production And Leaching Losses For Pasture-Based Dairying Systems, I. M. Brookes, D. J. Horne
Modelling Urine Nitrogen Production And Leaching Losses For Pasture-Based Dairying Systems, I. M. Brookes, D. J. Horne
IGC Proceedings (1977-2023)
Urine from dairy cattle grazing pastures with high crude protein (CP) concentrations is a major source of N lost in drainage water from New Zealand farms. This paper provides predictions of urinary N leaching losses for a range of stocking rates and levels of supplementation.
Management Options To Reduce N-Losses From Ploughed Grass-Clover, J. De Wit, G. J. Van Der Burgt, N. Van Eekeren
Management Options To Reduce N-Losses From Ploughed Grass-Clover, J. De Wit, G. J. Van Der Burgt, N. Van Eekeren
IGC Proceedings (1977-2023)
Nitrate (NO3-) leaching from grassland can be kept at acceptable levels, but is often high after ploughing for grassland renewal or for silage maize/grain production. In on-farm research with several organic farmers, management options are being explored to save scarce organic manure and to reduce N-losses.
Nutrient Cycling In A Tropical Grazing Land Ecosystem Of Southern India, K. S. T. K. Karunaichamy, Kailash Paliwal
Nutrient Cycling In A Tropical Grazing Land Ecosystem Of Southern India, K. S. T. K. Karunaichamy, Kailash Paliwal
IGC Proceedings (1977-2023)
The nutrient component of any ecosystem operates in a dynamic state through a series of inputs and outputs of the essential elements. Nutrients from plants are continuously transferred to soil via litter formation, which act as a reservoir for the plants in an ecosystem. Most of the studies on nutrient budgets and flux rates have been reported in forest communities and to a lesser degree in grassland. The present study was, therefore, aims to understand the variation of calcium (Ca) and magnesium (Mg) in the vegetation compartments and to quantify annual budget by estimating the annual uptake from soil and …
Integrated Nutrient Management For Natural Grasslands Of Mid-Hills Of Himalayas, I. Dev, S. Narayana, R. Singh, B. Misri, S. Sareen, S. Radotra
Integrated Nutrient Management For Natural Grasslands Of Mid-Hills Of Himalayas, I. Dev, S. Narayana, R. Singh, B. Misri, S. Sareen, S. Radotra
IGC Proceedings (1977-2023)
Livestock rearing is an important pursuit in mountain farming in India and plays a crucial role throughout the country. The preponderance of marginal and small landholdings (about 82%) in hilly regions does not allow the farmers to allocate even a small part of their land exclusively for forage production. In Himachal Pradesh state of India about 1.16 m ha (20% of the total area) is under permanent pastures and other grazing lands and none of the natural grasslands are fertilised in any form. Existing grasslands have deteriorated to such an extent that their carrying capacity is only 1.05 ACU (Adult …
Abiotic Resource Efficiency Of Grassland Production Systems In North-West Europe, M. Wachendorf, F. Taube
Abiotic Resource Efficiency Of Grassland Production Systems In North-West Europe, M. Wachendorf, F. Taube
IGC Proceedings (1977-2023)
Nitrate leaching and energy efficiency are key criteria of a resource efficient grassland production system. A four-year field experiment was conducted to evaluate the effects of N input and defoliation system on both criteria. The objective of this experiment was to develop strategies which help to facilitate future grassland production with maximum environmental friendliness.
Cap Reform And Nitrate Restrictions: Implications For Irish Grass Based Dairy Production Systems, Anne Marie Butler, M. Wallace, P. Dillon
Cap Reform And Nitrate Restrictions: Implications For Irish Grass Based Dairy Production Systems, Anne Marie Butler, M. Wallace, P. Dillon
IGC Proceedings (1977-2023)
The benefit of a systems approach to analysing production situations has long been recognised in agricultural research. The development and application of production-oriented dairy models offer tremendous capabilities for both encompassing the realities faced by producers while also considering the adaptation possibilities available to them in light of internal and external forces of change. This farm level dairy model represents one such approach. The objectives of the study were: (1) to develop a comprehensive farm-level model of Irish milk production systems and (2) to apply the model to identify optimal adaptation strategies of dairy farmers within the context of European …
Species-Rich Grassland As An Ecological Good In An Outcome-Based Payment Scheme, E. Bertke, R. Marggraf, Johannes Isselstein
Species-Rich Grassland As An Ecological Good In An Outcome-Based Payment Scheme, E. Bertke, R. Marggraf, Johannes Isselstein
IGC Proceedings (1977-2023)
Agriculture plays an important role in protecting the biodiversity of the rural environment. Since the reform of the EU's common agricultural policy (CAP) in 1992, agri-environment schemes have been supported by the EU within the framework of the second pillar of CAP. In these programmes, farmers were rewarded for environmental services. The predominantly action-oriented programmes imply particular disadvantages; they tend to lack economic efficiency and to fail with regard to the conservation and improvement of biodiversity (Kleijn & Sutherland, 2003; Wilhelm, 1999). This situation was the starting point for the development of an outcome-based payment scheme. We focus on the …
Silvopastoral Systems: Analyses Of An Alternative To Open Swards, James H. Mcadam, M. R. Mosquera-Losada, V. Papanastasis, Andrea Pardini, M. L. Rigueiro-Rodríguez
Silvopastoral Systems: Analyses Of An Alternative To Open Swards, James H. Mcadam, M. R. Mosquera-Losada, V. Papanastasis, Andrea Pardini, M. L. Rigueiro-Rodríguez
IGC Proceedings (1977-2023)
Silvopasture is a sustainable land use management practiced in most continents in the world including parts of southern Europe, but is not broadly used in northern and western Europe. The importance of this practice has been recognised and the last draft of the EU regulation by the European Agricultural Fund for Rural Development (http://europa.eu.int/comm/agriculture/capreform/rurdevprop_en.pdf) includes specifically funding for establishment of agroforestry practices in Europe. This paper discusses the advantages of managing semi intensive grassland within a silvopastoral system from an ecological, productive and social point of view in the south, south-central and western countries of Europe.