Showing results for: agriculture soil Articles
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Relationship between light and heavy fractions of organic matter for several agricultural soils in China
Although numerous studies about the nature and turnover of soil organic matter (SOM) in light and heavy fractions (LFOM and HFOM, respectively) have been made, little information is available in relation to the relationship between LFOM and HFOM, and no attempts have been made to quantify a general relationship between LFOM and HFOM for agricultural soils under field condition. Our hypothesis is ...
By IOS Press
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Sorption and desorption of alcohol sulfate surfactants in an agricultural soil
Alcohol sulfates are one of the most important types of commercial anionic surfactants and may pose serious environmental problems. The present study examines the sorption behavior of alcohol sulfates in an agricultural soil using a batch reactor and column experiments. Kinetics and equilibrium isotherms of the sorption/desorption processes of alcohol sulfate homologues: AS‐C12, AS‐C14, AS‐C16 ...
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Controlling Nitrogen with Clinoptilolite
With skyrocketing prices on the fertilizer market, and record high contamination levels in runoff from soil leaching, solutions for fixing nutrients in the root zone are of paramount importance. The price of nitrogen fertilizer is always in flux, but as of recently there is a distinct and obvious spike. Fertilizer prices are on the rise. Meanwhile the broad use of fertilizer in agriculture has ...
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Soil Microbial Community Response to Land Use Change in an Agricultural Landscape of Western Kenya
Tropical agroecosystems are subject to degradation processes such as losses in soil carbon, nutrient depletion, and reduced water holding capacity that occur rapidly resulting in a reduction in soil fertility that can be difficult to reverse. In this research, a polyphasic methodology has been used to investigate changes in microbial community structure and function in a series of tropical soils ...
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Aftermath of the Long-Term Application of Sludge and Water from a Sewage Treatment Plant to a Lemon Tree (Citrus limon) Plantation
The effect of sewage sludge application to agricultural soils in industrial countries (Raven and Loeppert 1997; Towers and Horne 1997) and that of the treated domestic and industrial effluents on plants (Hooda et al. 1997; Logan et al. 1997; Palacios et al. 1999; Samaras and Kallianou 2000, Weir and Allen 1997) have been ...
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The nitrogen balance for Catalan agriculture soils and livestock sectors
A comprehensive assessment of nitrogen metabolism in Catalonia (NE region of Spain) has been performed by the method of Substance Flow Analysis (SFA). Being agriculture soils and livestock sectors where the human food production stands, this paper is focused in the analysis of nitrogen dynamics in these sectors. Groundwater contamination, nitrogen accumulation in transition reservoirs (landfills, ...
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Abiotic nitrate retention in agroecosystems and a forest soil
Agricultural ecosystems are the primary source of nitrate (NO3–) pollution in many watersheds. We used a laboratory 15N tracer study with live and gamma irradiated soils to examine the role of land management in abiotic retention of NO3– in three agroecosytems and a forest soil. Nitrogen retention was defined as the quantity of 15N that remained in soil following salt extractions. Land management ...
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Use of nuclear techniques in the study of the behaviour of rare earth elements on the use of phosphogypsum in Cerrado agriculture
Phosphogypsum (PG) is a by-product of phosphoric acid industry. In Brazil, this material has been used as a conditioner for soils with high levels of aluminium. Taking into account the presence of radionuclides and Rare Earth Elements (REEs) in this material, a research project has been conducted in order to investigate the impact of using PG in crops cultivated in Cerrado soils. For this purpose ...
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Leaching of dissolved phosphorus from tile-drained agricultural areas
We investigated leaching of dissolved phosphorus (P) from 45 tile-drains representing animal husbandry farms in all regions of Denmark. Leaching of P via tile-drains exhibits a high degree of spatial heterogeneity with a low concentration in the majority of tile-drains and few tile-drains (15% in our investigation) having high to very high concentration of dissolved P. The share of dissolved ...
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The transport of three emerging pollutants through an agricultural soil irrigated with untreated wastewater
The aim of this work was to determine the mobility of naproxen, carbamazepine, and triclosan through a wastewater-irrigated agricultural soil. Transport experiments were carried out using undisturbed soil columns taken at 10 and 40 cm depths. The mobilization of the pollutants was evaluated using two hydrological regimes transient flow for superficial columns and steady-state conditions for the ...
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Soil organic matter content effects on dermal pesticide bioconcentration in American toads (Bufo americanus)
Pesticides have been implicated as a major factor in global amphibian declines and may pose great risk to terrestrial phase amphibians moving to and from breeding ponds on agricultural landscapes. Dermal uptake from soil is known to occur in amphibians, but predicting pesticide availability and bioconcentration across soil types is not well understood. This study was designed to compare uptake ...
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Reduced mobility of fomesafen through enhanced adsorption in biochar‐amended soil
The residual soil material resulting from biomass thermochemical transformation during carbon separation, known as biochar, has been introduced as a soil amendment because of its numerous environmental benefits, including uses for contaminated land management. Adsorption and leaching of fomesafen in soils amended with 3 different rates of rice hull biochar (0.5%, 1%, and 2% w/w) under ...
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A simple approach to assess N load capacity of rice paddy fields in the southern Taihu Lake watershed
High nitrogen (N) leaching from irrigated agricultural soils is the result of N input exceeding soil N load capacity (NLC). A simple approach was developed in this research to assess the NLC of paddy soils in the southern Taihu Lake watershed. Paddy soils were classified into four types (Submergenic, Illuvium, Gleyed, and Percogenic) and 28 soil samples representing all four types were ...
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Sorption and degradation of wastewater-associated pharmaceuticals and personal care products in agricultural soils and sediment
Pharmaceuticals and personal care products (PPCPs) have drawn popular concerns recently as an emerging class of aquatic contaminants. In this study, adsorption and degradation of four selected PPCPs, metronidazole, tinidazole, caffeine and chloramphenicol, have been investigated in the laboratory using two agricultural soils in China and sediment from Changjiang River. Adsorption tests using a ...
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Activity and ecological implications of maize‐expressed transgenic endo‐1,4‐β‐D‐glucanase in agricultural soils
Plant expression of thermostable endoglucanase (E1) [pdb:1ECE] has been proposed for improved conversion of lignocellulose to ethanol for fuel production. Residues of E1‐expressing maize may effect ecological services (e.g., C mineralization and biogeochemical cycling) on soils where they occur. Therefore, the activity of residual E1 was investigated using soils amended with bacterial and ...
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Phytoextraction of Phosphorus-enriched grassland soils
Received for publication February 7, 2008. High soil P contents in agricultural soils in the Netherlands cause excessive losses of P to surface waters. The reductions in P application rates in the present manure policy are not sufficient to reach surface water quality standards resulting from the European Water Framework Directive in 2015. Accordingly, additional measures are necessary to reduce ...
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Side-band injection of acidified cattle slurry as starter P-fertilization for maize seedlings
Abstract Accumulation of phosphorus (P) in agricultural soils has caused increasing environmental concerns. Maize cropped for fodder implies return of animal manures rich in nutrients. In addition, starter fertilization with mineral P is used in cold conditions for maize cropping. It was hypothesized that the use of the additional mineral P could be excluded by increased availability of the P ...
By Biocover A/S
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Heavy Metal Accumulation of Edible Vegetables Cultivated in Agricultural Soil in the Suburb of Zhengzhou City, People`s Republic of China
Heavy metals are not biodegradable and can accumulate in human vital organs, producing progressive toxicity. Many researches have revealed the carcinogenic effects of several heavy metals such as cadmium (Cd), chromium (Cr), lead (Pb), mercury (Hg) and arsenic (As) (Trichopoulos 1997; Feig et al. 1994; Gibb and Chen ...
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Motivations for organic farming among farmers from Malopolska Province, Poland
Poor condition of Polish agriculture, clean soil environment and extensive methods of production make Poland particularly suitable for developing environmentally friendly forms of farming. In the last decade the number of people who have decided to convert from old, conventional farms to new, environmentally friendly ones, has markedly increased. The objective of this study was to find out what ...
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Dolomite and phosphogypsum surface application effects on annual crops nutrition and yield
Brazil has extensive area with acid soils. Using phosphogypsum and soil acidity tolerant cultivars are alternatives to crop establishment in no-till system without previous limestone incorporation in many agricultural soils of Brazil. However, it remains unknown how phosphogypsum and limestone surface application affects rice (Oryza sativa L.) and common bean (Phaseolus vulgaris L.) nutrition and ...
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