55 results match your criteria npk unfertilized


60 years of fertilization and liming impacts on soil organic carbon stabilization in a sub-tropical Alfisol.

Environ Sci Pollut Res Int 2021 Apr 21. Epub 2021 Apr 21.

Environmental Sciences and Biomedical Metrology Division, CSIR-National Physical Laboratory, New Delhi, 110012, India.

Limited information is available on the C stabilization mechanism of tropical soils under different management practices including long-term organic manuring, mineral fertilization alone, or in combination with lime. Hence, to understand the effect of continuous application (for 60 years) of organic manure, fertilizer, and lime alone or in combination on an acidic Alfisol, stabilization of soil organic carbon (SOC) was evaluated under maize (Zea mays L.) wheat (Triticum aestivum L. Read More

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Residual effects of four-year amendments of organic material on NO production driven by ammonia-oxidizing archaea and bacteria in a tropical vegetable soil.

Sci Total Environ 2021 Aug 26;781:146746. Epub 2021 Mar 26.

Hainan Key Laboratory of Tropical Eco-Circular Agriculture, Environment and Plant Protection Institute, Chinese Academy of Tropical Agricultural Sciences, Haikou 571737, China; National Agricultural Experimental Station for Agricultural Environment, Danzhou 571737, China; College of Ecology and Environment, Hainan University, Haikou 570228, China. Electronic address:

Organic material (OM) applied to cropland not only enhances soil fertility but also profoundly affects soil nitrogen cycling. However, little is known about the relative contributions of soil ammonia-oxidizing archaea (AOA) and bacteria (AOB) to nitrous oxide (NO) production during ammonia oxidation in response to the additions of diverse types of OMs in the tropical soil for vegetable production. Herein, the soils were sampled from a tropical vegetable field subjected to 4-year consecutive amendments of straw or manure. Read More

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Inorganic Chemical Fertilizer Application to Wheat Reduces the Abundance of Putative Plant Growth-Promoting Rhizobacteria.

Front Microbiol 2021 11;12:642587. Epub 2021 Mar 11.

Sustainable Agriculture Sciences, Rothamsted Research, Harpenden, United Kingdom.

The profound negative effect of inorganic chemical fertilizer application on rhizobacterial diversity has been well documented using 16S rRNA gene amplicon sequencing and predictive metagenomics. We aimed to measure the function and relative abundance of readily culturable putative plant growth-promoting rhizobacterial (PGPR) isolates from wheat root soil samples under contrasting inorganic fertilization regimes. We hypothesized that putative PGPR abundance will be reduced in fertilized relative to unfertilized samples. Read More

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Long-Term Fertilization Shapes the Putative Electrotrophic Microbial Community in Paddy Soils Revealed by Microbial Electrosynthesis Systems.

Environ Sci Technol 2021 03 18;55(5):3430-3441. Epub 2021 Feb 18.

State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Shuangqing Road, No. 18, Haidian District, Beijing 100085, China.

Electrotrophs play an important role in biogeochemical cycles, but the effects of long-term fertilization on electrotrophic communities in paddy soils remain unclear. Here, we explored the responses of electrotrophic communities in paddy soil-based microcosms to different long-term fertilization practices using microbial electrosynthesis systems (MESs), high-throughput quantitative PCR, and 16s rRNA gene-based Illumina sequencing techniques. Compared to the case in the unfertilized soil (CK), applications of only manure (M); only chemical nitrogen, phosphorous, and potassium fertilizers (NPK); and M plus NPK (MNPK) clearly changed the electrotrophic bacterial community structure. Read More

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Impacts of long-term inorganic and organic fertilization on phosphorus adsorption and desorption characteristics in red paddies in southern China.

PLoS One 2021 29;16(1):e0246428. Epub 2021 Jan 29.

Guangdong Provincial Key Laboratory for Radionuclides Pollution Control and Resources, School of Environmental Science and Engineering, Guangzhou University, Guangzhou, China.

Soil phosphorus (P) adsorption and desorption occur in an important endogenous cycle linked with soil fertility problems and relevant to the environmental risk assessment of P. In our study, the effect of long-term inorganic and organic fertilization on P adsorption and desorption characteristics in relation to changes in soil properties was evaluated by selecting three long-term experimental sites in southern China. The selected treatments at each site were CK (unfertilized), NPK (synthetic nitrogen, phosphorus and potassium) and NPKM (synthetic NPK plus manure). Read More

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January 2021

Case Study upon Foliar Application of Biofertilizers Affecting Microbial Biomass and Enzyme Activity in Soil and Yield Related Properties of Maize and Wheat Grains.

Biology (Basel) 2020 Dec 8;9(12). Epub 2020 Dec 8.

Institute of Soil Science, Teodora Drajzera 7, 11000 Belgrade, Serbia.

This study evaluated the effects of the application of microbial inoculants (N-fixing and spp.), two rates of composite mineral fertilizers, and their combination on microbial biomass carbon (MBC), dehydrogenase (DHA), and proteinase activity (PTA) in Lessivated Cambisol and yield-related properties of maize and wheat grains in a two-year trial. Unfertilized soil was used as a control variant. Read More

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December 2020

Microbial Communities in Soils and Endosphere of L. and their Response to Long-Term Fertilization.

Microorganisms 2020 Sep 8;8(9). Epub 2020 Sep 8.

Department of Biochemistry and Microbiology, Faculty of Food and Biochemical Technology, University of Chemistry and Technology, Prague, Technicka 3, 166 28 Prague 6, Czech Republic.

An understanding of how fertilization influences endophytes is crucial for sustainable agriculture, since the manipulation of the plant microbiome could affect plant fitness and productivity. This study was focused on the response of microbial communities in the soil and tubers to the regular application of manure (MF; 330 kg N/ha), sewage sludge (SF; 330 and SF3x; 990 kg N/ha), and chemical fertilizer (NPK; 330-90-300 kg N-P-K/ha). Unfertilized soil was used as a control (CF), and the experiment was set up at two distinct sites. Read More

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September 2020

Nitrous oxide emissions in response to straw incorporation is regulated by historical fertilization.

Environ Pollut 2020 Nov 13;266(Pt 3):115292. Epub 2020 Aug 13.

Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences (CAAS), Beijing, 100081, China.

The incorporation of crop straw with fertilization is beneficial for soil carbon sequestration and cropland fertility improvement. Yet, relatively little is known about how fertilization regulates the emissions of the greenhouse gas nitrous oxide (NO) in response to straw incorporation, particularly in soils subjected to long-term fertilization regimes. Herein, the arable soil subjected to a 31-year history of five inorganic or organic fertilizer regimes (unfertilized; chemical fertilizer application, NPK; 200% NPK application, 2 × NPK; manure application, M; NPK plus manure application, NPKM) was incubated with and without rice straw to evaluate how historical fertilization influences the impact of straw addition on NO emissions. Read More

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November 2020

Soil aggregation and soil aggregate stability regulate organic carbon and nitrogen storage in a red soil of southern China.

J Environ Manage 2020 Sep 15;270:110894. Epub 2020 Jun 15.

Dept. Soil Sci. and Agric. Chem., Eng. Polytech. School, Campus univ. 27002 Lugo, Univ. Santiago de Compostela, Spain.

Soil aggregation plays a critical role in the maintenance of soil structure, as well as in its productivity. Fertilization influences soil aggregation, especially by regulating soil organic carbon (SOC) and total nitrogen (TN) contents in aggregate fractions. The present study evaluated the influence of three contrasting fertilizer regimes (unfertilized control -CK-, mineral fertilization -NPK- and manure combined with NPK -NPKM) on soil aggregate stability, aggregate-associated organic carbon and total nitrogen sequestration and mineralization of SOC. Read More

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September 2020

The response of soil Olsen-P to the P budgets of three typical cropland soil types under long-term fertilization.

PLoS One 2020 18;15(3):e0230178. Epub 2020 Mar 18.

Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences/National Engineering Laboratory for Improving Quality of Arable Land, Beijing, P. R. China.

The Olsen phosphorus (Olsen-P) concentration of soil is generally a good indicator for estimating the bioavailability of P and environmental risk in soils. To maintain soil Olsen-P at adequate levels for crop growth and environmental sustainability, the relationship between soil Olsen-P and the P budget (the P input minus the output) as well as the variations of soil Olsen-P and P budget were investigated from three long-term (22 years) experiments in China. Five treatments were selected: (1) unfertilized control (CK); (2) nitrogen and potassium (NK); (3) nitrogen, phosphorous, and potassium (NPK); (4) nitrogen, phosphorous, potassium and straw; (5) nitrogen, phosphorous, potassium and manure. Read More

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Dynamic of Phenolic Compounds, Antioxidant Activity, and Yield of Rhubarb under Chemical, Organic and Biological Fertilization.

Plants (Basel) 2020 Mar 11;9(3). Epub 2020 Mar 11.

Department of Horticultural Technologies, "Ion Ionescu de la Brad" University of Agricultural Sciences and Veterinary Medicine. 3 M. Sadoveanu, 700440 Iasi, Romania.

In recent years, rhubarb is being increasingly cultivated, as it provides early yields when the vegetables supply to market is deficient and shows high levels of both polyphenols content and antioxidant capacity in edible parts. In 2017, we investigated crops of the rhubarb cultivar Victoria to the fifth year of production. Comparisons were performed between three root phase fertilizations-chemical (NPK 16-16-16), organic (Orgevit), and biological (Micoseeds MB)-plus an unfertilized control. Read More

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Improving phosphorus sustainability in intensively managed grasslands: The potential role of arbuscular mycorrhizal fungi.

Sci Total Environ 2020 Mar 28;706:135744. Epub 2019 Nov 28.

Queen's University of Belfast, Belfast BT9 7BL, Northern Ireland, UK.

Long-term nutrient fertilization of grassland soils greatly increases plant yields but also profoundly alters ecosystem phosphorus (P) dynamics. Here, we addressed how long-term P fertilization may affect ecosystem P budget, P use efficiency (PUE) and the abundance of arbuscular mycorrhizal fungi (AMF), which play a key role in the acquisition of P by plants. We found that 47 years of organic P applications increased soil P availability and total soil P stocks up to 1600% and 400%, respectively, compared to unfertilized-control soils. Read More

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Manure amendment increased the abundance of methanogens and methanotrophs but suppressed the type I methanotrophs in rice paddies.

Environ Sci Pollut Res Int 2020 Mar 31;27(8):8016-8027. Epub 2019 Dec 31.

College of Agronomy and Biotechnology, China Agricultural University, No. 2 Yuanmingyuan West Road, Haidian District, Beijing, 100193, China.

Methane (CH) emission is the consequence of CH production and consumption performed by methanogens and methanotrophs, respectively. Fertilization is an important factor that regulates the behavior of methanogens and methanotrophs; however, the effect of manure and rice straw addition combined with inorganic fertilizers on these communities is not well understood. This study aimed to explore how manure and rice straw amendments together with inorganic fertilizers influenced the methanogenic and methanotrophic communities in a 31-year fertilized rice paddy. Read More

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Nickel phytomining from industrial wastes: Growing nickel hyperaccumulator plants on galvanic sludges.

J Environ Manage 2020 Jan 15;254:109798. Epub 2019 Nov 15.

University of Natural Resources and Life Sciences, Vienna, Department of Forest and Soil Sciences, Institute of Soil Research, Konrad-Lorenz Straße 24, 3430 Tulln, Austria.

Nickel (Ni) is used in numerous industrial processes, with large amounts of Ni-rich industrial wastes produced, which are largely sent to landfill. Nickel recovery from waste materials that would otherwise be disposed is of particular interest. Nickel phytomining represents a new technology in which hyperaccumulator plants are cultivated on Ni-rich substrates for commercial metal recovery. Read More

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January 2020

Soil Nematode Abundances were Increased by an Incremental Nutrient Input in a Paddy-upland Rotation System.

Helminthologia 2018 Dec 27;55(4):322-333. Epub 2018 Oct 27.

Institute of Plant Protection and Soil Fertilizer, Hubei Academy of Agricultural Sciences, Key Laboratory of Fertilizer Resource Utilization in Wastes, Ministry of Agriculture, Wuhan 430064, P. R. China.

To study the effect of fertilization on soil nematode communities in a paddy-upland rotation system, an ongoing thirty-three years long-term fertilizer experiment is conducted which includes seven treatments; an unfertilized treatment (control), nitrogen (N), phosphorus (P), potassium (K) fertilizer treatments (N, NP, NPK) and organic manure (M) combined with chemical fertilizer treatments (MN, MNP, and MNPK). The soil nematode community structure and crop yields were determined in 2012 and 2013. Overall total nematode abundance was increased by an incremental nutrient input both in the rice and wheat fields. Read More

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December 2018

Beetroot mineral composition affected by mineral and organic fertilization.

PLoS One 2019 6;14(9):e0221767. Epub 2019 Sep 6.

Department of Plant Nutrition, Faculty of Agriculture, University of Zagreb, Zagreb, Croatia.

In modern agriculture, besides providing high and stable yields, it is imperative to produce products with a high nutritive quality. The goal of this study was to determine the effect of different fertilization regimes on the macro- and micronutrients in beetroot. A 3-year field trial was set up according to a Latin square method with four types of fertilization (unfertilized control, 50 t stable manure ha-1, and 500 and 1,000 kg NPK 5-20-30 ha-1). Read More

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Characterization of fluvo-aquic soil phosphorus affected by long-term fertilization using solution P NMR spectroscopy.

Sci Total Environ 2019 Nov 16;692:89-97. Epub 2019 Jul 16.

Fengqiu Agro-ecological Experimental Station, State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China.

Reducing the applications of mineral phosphorus (P) fertilizers and supplementing them by organic fertilizers is becoming a necessary practice in the North China Plain due to overuse of mineral P fertilizers and improper disposal of organic wastes. Knowledge is needed about how the long-term substitution of mineral fertilizers by organic fertilizers affects soil P forms in order to understand soil P transformation and crop P uptake. In this study, we used solution P nuclear magnetic resonance (NMR) spectroscopy to characterize P forms in fluvo-aquic soil after 26 years of different fertilization management strategies, organic compost (OM), half compost in combination with half mineral fertilizer NPK (1/2 OM), mineral fertilizer NPK (NPK), mineral fertilizer NK (NK), and an unfertilized control (CK). Read More

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November 2019

Divergent responses of bacterial activity, structure, and co-occurrence patterns to long-term unbalanced fertilization without nitrogen, phosphorus, or potassium in a cultivated vertisol.

Environ Sci Pollut Res Int 2019 May 16;26(13):12741-12754. Epub 2019 Mar 16.

State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing, 210008, China.

Unbalanced fertilization lacking nitrogen (N), phosphorus (P), or potassium (K) is a worldwide phenomenon; however, whether they affect bacterial community composition and intraspecific interactions in a similar pattern and how they affect bacterial activity are not systematically compared. Soils under different kinds of unbalanced fertilization in a 21-year field experiment were collected to investigate the variation in dehydrogenase activity (DHA), bacterial community diversity, structure, composition, and possible interactions. Compared to the balanced fertilization of NPK, the DHA from unbalanced fertilization of NP, PK, and NK was 8. Read More

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[Effect of Long-term Dairy Manure Amendment on NO and NO Emissions from Summer Maize-Winter Wheat Cropping Systems].

Huan Jing Ke Xue 2019 Feb;40(2):885-892

College of Natural Resources and Environment, Northwest Agricultural and Forest University, Yangling 712100, China.

Annual nitrous oxide (NO) and nitric oxide (NO) emissions were measured within a 27 year fertilization experiment in Guanzhong Plain. Gas samples were collected using static chambers from June 2017 to June 2018. The primary objectives of this study were to quantify the variations in NO and NO emissions and evaluate the effect of manure amendment on gas losses. Read More

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February 2019

Impact of organic and inorganic fertilizers on the yield and quality of silage corn intercropped with soybean.

PeerJ 2018 26;6:e5280. Epub 2018 Oct 26.

Department of Crop Science, Faculty of Agriculture, Universiti Putra Malaysia, Serdang, Selangor, Malaysia.

Background: Corn silage is an important feed for intense ruminant production, but the growth of corn relies heavily on the use of chemical fertilizers. Sustainable crop production requires careful management of all nutrient sources available on a farm, particularly in corn-based cropping systems.

Methods: Experiments were conducted to determine the appropriate technique of corn-legume intercropping in conjunction with the supplemental use of chemical fertilizers, organic manure, and biofertilizers (BFs). Read More

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October 2018

Nutrients and non-essential elements in edible crops following long-term mineral and compost fertilization of a Mediterranean agricultural soil.

Environ Sci Pollut Res Int 2019 Dec 8;26(35):35353-35364. Epub 2018 Oct 8.

Dipartimento di Chimica e Biologia "Adolfo Zambelli", Università degli Studi di Salerno, Via Giovanni Paolo II, 132, 84084, Fisciano, SA, Italy.

The effects of long-term soil fertilizations on nutrient and non-essential element concentrations in edible parts of three crops important in human diet were investigated repeating four treatments (biowaste compost, biowaste compost plus mineral nitrogen, mineral NPK, unfertilized control) for seven consecutive years (2007-2014). Fruits of Solanum lycopersicum cv San Marzano collected in 2011 and 2012, bulbs of Allium cepa cv Bianca di Pompei collected in 2012 and 2013, and bulbs of Foeniculum vulgare cv Orbit collected in 2014 were analyzed. Wide variations in element concentrations were observed along time and among species, with Ca, K, Mg, and Na higher in fennel bulbs and Cd, Cr, Mn, Ni, Pb, and Zn higher in tomato fruits, where Cd reached concentrations up to ninefold higher than the permitted values (EU Regulation n. Read More

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December 2019

Soil organic matter widens the range of water contents for tillage.

Soil Tillage Res 2018 Oct;182:57-65

Department of Agroecology, Aarhus University, Research Centre Foulum, Blichers Allé 20, P.O. Box 50, DK-8830, Tjele, Denmark.

The effects of soil organic matter on the water contents for tillage were investigated by sampling soils with a uniform texture, but a range of soil organic carbon (SOC) from two long-term field experiments at Highfield in Rothamsted Research, UK and Askov Experimental Station, Denmark. The treatments studied in Highfield were Bare fallow (BF), Continuous arable rotation (A), Ley-arable (LA) and Grass (G); and in Askov: unfertilized (UNF), ½ mineral fertilizer (½ NPK), 1 mineral fertilizer (1NPK), and 1½ animal manure (1½AM). Minimally disturbed soil cores (100 cm) were sampled per plot in both locations from 6 to 10 cm depth to generate water retention data. Read More

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October 2018

Cassava response to the integrated use of manure and NPK fertilizer in Zambia.

Heliyon 2018 Aug 27;4(8):e00759. Epub 2018 Aug 27.

Plot 1244 Ibex Hill, Lusaka, Zambia.

Cassava is Africa's second most important food source in terms of calories consumed per capita. However, farmers use little or no fertilizer on cassava and scant information is available regarding the cassava yield response to mineral and organic fertilizer inputs in Zambia. This study was undertaken to determine the response of cassava to the integrated use of organic and inorganic nutrient sources in two contrasting agroecological zones of Zambia; Mansa located in Zone III and Kabangwe located in Zone II. Read More

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[Effect of Long-term Organic Amendments on Nitric Oxide Emissions from the Summer Maize-Winter Wheat Cropping System in Guanzhong Plain].

Huan Jing Ke Xue 2018 Jun;39(6):2819-2826

College of Natural Resources and Environment, Northwest A & F University, Yangling 712100, China.

Agricultural soil is a significant source of nitric oxide (NO). The primary aim of this study was to quantify the effect of long-term organic amendments on NO emissions from the summer maize-winter wheat cropping system in Guanzhong Plain. NO fluxes were regularly measured by the static chamber method for one year (June 2016 to June 2017). Read More

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Manure amendment increases the content of nanomineral allophane in an acid arable soil.

Sci Rep 2017 10 27;7(1):14256. Epub 2017 Oct 27.

Jiangsu Provincial Coordinated Research Center for Organic Solid Waste Utilization, Nanjing Agricultural University, Nanjing, 210095, China.

Natural nanoparticles are of central importance in the environment, e.g. sorption of soil organic carbon (SOC) and contaminants. Read More

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October 2017

Interactive effect of gibberellic acid and NPK fertilizer combinations on ramie yield and bast fibre quality.

Sci Rep 2017 09 6;7(1):10647. Epub 2017 Sep 6.

MOA Key Laboratory of Crop Ecophysiology and Farming System in the Middle Reaches of the Yangtze River, College of Plant Science and Technology, Huazhong Agricultural University, Wuhan, 430070, China.

Understanding the effects of different combinations of nitrogen (N), phosphorus (P) and potassium (K) fertilizers and the effects of GA (gibberellic acid) foliar spray on the fiber quality and yield of ramie are important for maximizing the economic value of these plants. Three pot experiments were conducted using low NPK (140:70:140 kg/ha), normal NPK (280:140:280 kg/ha), and low NPK + GA (10 mg/L) treatments. In each experiment, following fertilizers were applied: no fertilizer (control), N, P, K, NP, NK, PK, and NPK. Read More

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September 2017

Fertilization Shapes Bacterial Community Structure by Alteration of Soil pH.

Front Microbiol 2017 18;8:1325. Epub 2017 Jul 18.

College of Resources and Environment, Southwest UniversityChongqing, China.

Application of chemical fertilizer or manure can affect soil microorganisms directly by supplying nutrients and indirectly by altering soil pH. However, it remains uncertain which effect mostly shapes microbial community structure. We determined soil bacterial diversity and community structure by 454 pyrosequencing the V1-V3 regions of 16S rRNA genes after 7-years (2007-2014) of applying chemical nitrogen, phosphorus and potassium (NPK) fertilizers, composted manure or their combination to acidic (pH 5. Read More

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Effect of different nitrogen fertilizer treatments on the conversion of Miscanthus×giganteus to ethanol.

Bioresour Technol 2017 Nov 4;243:731-737. Epub 2017 Jul 4.

Chair of Food Biotechnology, Faculty of Food Sciences, University of Warmia and Mazury in Olsztyn, Heweliusza 1, 10-718 Olsztyn, Poland.

Miscanthus×giganteus is a perennial rhizomatous grass which is used as a biofuel crop. Due to its high yields, low production costs, resistance to low temperatures, low soil requirements and, above all, high cellulose content, miscanthus can be a useful resource for ethanol production. The aim of this study was to determine the effect of two fertilization regimes (sewage sludge/mineral NPK) during miscanthus cultivation on the chemical composition of biomass, the content of major lignocellulosic factions and the effectiveness of miscanthus conversion to bioethanol. Read More

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November 2017

Comparison of rhizosphere properties as affected by different Bt- and non-Bt-cotton (Gossypium hirsutum L.) genotypes and fertilization.

Environ Monit Assess 2017 Jun 20;189(6):278. Epub 2017 May 20.

Pesticide Quality Control Laboratory, Bahawalpur, 63100, Pakistan.

Incorporation of genetically modified crops in the cropping system raises the need for studying the effect of these crops on the soil ecosystem. The current study aimed to compare the effect of Bacillus thuringiensis (Bt)- and non-Bt-cotton (Gossypium hirsutum L.) genotypes on rhizosphere properties under fertilized and unfertilized soil conditions. Read More

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The Combination of and Chemical Fertilization Leads to the Deregulation of Phytohormone Networking, Preventing the Adaptive Responses of Tomato Plants to Salt Stress.

Front Plant Sci 2017 2;8:294. Epub 2017 Mar 2.

Spanish-Portuguese Institute for Agricultural Research (CIALE), Department of Microbiology and Genetics, University of SalamancaSalamanca, Spain; Embrapa EnvironmentJaguariúna, Brazil.

Plants have evolved effective mechanisms to avoid or reduce the potential damage caused by abiotic stresses. In addition to biocontrol abilities, genus fungi promote growth and alleviate the adverse effects caused by saline stress in plants. Morphological, physiological, and molecular changes were analyzed in salt-stressed tomato plants grown under greenhouse conditions in order to investigate the effects of chemical and biological fertilizations. Read More

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