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Soil fertility

Zhen-Zhen Cao, Mei-Ling Qin, Xiao-Yan Lin, Zhi-Wei Zhu, Ming-Xue Chen
Sulfur (S) fertilizer application in rice (Oryza sativa L.) is crucial in determining rice grain productivity and quality. However, little information is available concerning the effect of S supply on cadmium (Cd) uptake and translocation in rice. In this study, both hydroponic and soil experiments were conducted to investigate the influence of S supply on Cd accumulation in rice under two Cd levels (0 and 50 μM), combined with three S concentrations (0, 2.64 and 5.28 mM). The moderate and excessive S supply (2...
March 13, 2018: Environmental Pollution
Christopher B Skinner, Christopher J Poulsen, Justin S Mankin
Plants influence extreme heat events by regulating land-atmosphere water and energy exchanges. The contribution of plants to changes in future heat extremes will depend on the responses of vegetation growth and physiology to the direct and indirect effects of elevated CO2 . Here we use a suite of earth system models to disentangle the radiative versus vegetation effects of elevated CO2 on heat wave characteristics. Vegetation responses to a quadrupling of CO2 increase summer heat wave occurrence by 20 days or more-30-50% of the radiative response alone-across tropical and mid-to-high latitude forests...
March 15, 2018: Nature Communications
Baoku Shi, Junmei Zhang, Chengliang Wang, Jianying Ma, Wei Sun
The effects of manipulating nitrogen (N) deposition, with the use of a single form of N, on soil enzyme activities have been extensively studied. However, the impacts varying the N type (organic vs. inorganic) on soil hydrolytic enzyme activities have been less studied. We performed a 60 day incubation experiment using saline-alkaline soil. The objectives were to explore how the microbial biomass and enzyme activities respond to a mixed N addition at different inorganic to organic N ratios. The experimental design was full factorial, with two rates of N addition (10 g N m-2 and 20 g N m-2 ) and four ratios of N addition (inorganic N:organic N = 10:0, 7:3, 3:7, 1:9)...
March 14, 2018: Scientific Reports
J Leifeld, L Menichetti
Soil carbon sequestration and avoidable emissions through peatland restoration are both strategies to tackle climate change. Here we compare their potential and environmental costs regarding nitrogen and land demand. In the event that no further areas are exploited, drained peatlands will cumulatively release 80.8 Gt carbon and 2.3 Gt nitrogen. This corresponds to a contemporary annual greenhouse gas emission of 1.91 (0.31-3.38) Gt CO2 -eq. that could be saved with peatland restoration. Soil carbon sequestration on all agricultural land has comparable mitigation potential...
March 14, 2018: Nature Communications
Xin-Li An, Qing-Lin Chen, Dong Zhu, Jian-Qiang Su
Struvite recovered from wastewater is promising for recycling phosphorus into soil as fertilizers. However, struvite application may prompt the proliferation of antibiotic resistance in soil and plant. This study examined the impacts of struvite application and biochar amendment on integrons abundance and gene cassette contexts in rhizosphere soil and phyllosphere using quantitative PCR and clone library analysis. Microcosm experiments revealed that class 1 integron was the most prevalent in all samples, with higher concentration and higher relative abundance in rhizosphere than those in phyllosphere...
March 11, 2018: Science of the Total Environment
Tessa Camenzind, Edith C Hammer, Johannes Lehmann, Dawit Solomon, Sebastian Horn, Matthias C Rillig, Stefan Hempel
The socio-economic values of fertile and carbon-rich Dark Earth soils are well described from the Amazon region. Very recently, Dark Earth soils were also identified in tropical West Africa, with comparable beneficial soil properties and plant growth-promoting effects. The impact of this management technique on soil microbial communities, however, is less well understood, especially with respect to the ecologically relevant group of arbuscular mycorrhizal (AM) fungi. Thus, we tested the hypotheses that (1) improved soil quality in African Dark Earth (AfDE) will increase soil microbial biomass and shift community composition and (2) concurrently increased nutrient availability will negatively affect AM fungal communities...
April 1, 2018: FEMS Microbiology Ecology
Luisa F Gómez, Isaura P Torres, María Del P Jiménez, Juan G McEwen, Catalina de Bedout, Carlos A Peláez, José M Acevedo, María L Taylor, Myrtha Arango
Histoplasma capsulatum is the causative agent of histoplasmosis and this fungus inhabits soils rich in phosphorus and nitrogen that are enriched with bird and bat manure. The replacement of organic matter in agroecosystems is necessary in the tropics, and the use of organic fertilizers has increased. Cases and outbreaks due to the presence of the fungus in these components have been reported. The Instituto Colombiano Agropecuario resolution 150 of 2003 contains the parameters set by the Colombian Technical Standard (NTC 5167) on the physicochemical and microbiological features of fertilizers, but it does not regulate the search for H...
March 12, 2018: American Journal of Tropical Medicine and Hygiene
Jiemeng Tao, Delong Meng, Chong Qin, Xueduan Liu, Yili Liang, Yunhua Xiao, Zhenghua Liu, Yabing Gu, Juan Li, Huaqun Yin
Microbes play a critical role in soil global biogeochemical circulation and microbe-microbe interactions have also evoked enormous interests in recent years. Utilization of green manures can stimulate microbial activity and affect microbial composition and diversity. However, few studies focus on the microbial interactions or detect the key functional members in communities. With the advances of metagenomic technologies, network analysis has been used as a powerful tool to detect robust interactions between microbial members...
March 12, 2018: Applied Microbiology and Biotechnology
Yanan Wan, Aboubacar Younoussa Camara, Qingqing Huang, Yao Yu, Qi Wang, Huafen Li
The accumulation of arsenic (As) in rice grain is a potential threat to human health. Our study investigated the possible mediatory role of selenite fertilization on As uptake and accumulation by rice (Oryza sativa L.) under different water management regimes (aerobic or flooded) in a pot experiment. Soil solutions were also extracted during the growing season to monitor As dynamics. Results showed that As contents in the soil solutions, seedlings, and mature rice were higher under flooded than under aerobic water management...
March 9, 2018: Ecotoxicology and Environmental Safety
Wenyou Hu, Huifeng Wang, Lurui Dong, Biao Huang, Ole K Borggaard, Hans Christian Bruun Hansen, Yue He, Peter E Holm
Intensive human activities, in particular agricultural and industrial production have led to heavy metal accumulation in the peri-urban agricultural soils of China threatening soil environmental quality and agricultural product security. A combination of spatial analysis (SA), Pb isotope ratio analysis (IRA), input fluxes analysis (IFA), and positive matrix factorization (PMF) model was successfully used to assess the status and sources of heavy metals in typical peri-urban agricultural soils from a rapidly developing region of China...
March 9, 2018: Environmental Pollution
Xuebo Zheng, Zhiman Yang, Xiaohui Xu, Xiaoshuang Shi, Meng Dai, Rongbo Guo
The aim of this work was to explore the potential application of biochar from distillers' grains anaerobic digestion residue pyrolyzed at 700 °C (ADR-DG700 ) to ammonium (NH4 + ) adsorption from aqueous solution, as well as its effect on NH4 + leaching from an Ultisol. The adsorption kinetic of NH4 + on the ADR-DG700 could be described by an Elovich model (R2  = 0.995), and the combined Langmuir-Freundlich model (R2  = 0.997) fitted the isotherm data better than the Langmuir, Freundlich, Redlich-Peterson, and Temkin models with a maximum adsorption of 11...
March 11, 2018: Environmental Science and Pollution Research International
Michael Hemkemeyer, Anja B Dohrmann, Bent T Christensen, Christoph C Tebbe
Genetic fingerprinting demonstrated in previous studies that differently sized soil particle fractions (PSFs; clay, silt, and sand with particulate organic matter (POM)) harbor microbial communities that differ in structure, functional potentials and sensitivity to environmental conditions. To elucidate whether specific bacterial or archaeal taxa exhibit preference for specific PSFs, we examined the diversity of PCR-amplified 16S rRNA genes by high-throughput sequencing using total DNA extracted from three long-term fertilization variants (unfertilized, fertilized with minerals, and fertilized with animal manure) of an agricultural loamy sand soil and their PSFs...
2018: Frontiers in Microbiology
Wafa Hassen, Mohamed Neifar, Hanene Cherif, Afef Najjari, Habib Chouchane, Rim C Driouich, Asma Salah, Fatma Naili, Amor Mosbah, Yasmine Souissi, Noura Raddadi, Hadda I Ouzari, Fabio Fava, Ameur Cherif
A number of Pseudomonas strains function as inoculants for biocontrol, biofertilization, and phytostimulation, avoiding the use of pesticides and chemical fertilizers. Here, we present a new metabolically versatile plant growth-promoting rhizobacterium, Pseudomonas rhizophila S211, isolated from a pesticide contaminated artichoke field that shows biofertilization, biocontrol and bioremediation potentialities. The S211 genome was sequenced, annotated and key genomic elements related to plant growth promotion and biosurfactant (BS) synthesis were elucidated...
2018: Frontiers in Microbiology
A E Johnston, P R Poulton
Long-term field experiments that test a range of treatments and are intended to assess the sustainability of crop production, and thus food security, must be managed actively to identify any treatment that is failing to maintain or increase yields. Once identified, carefully considered changes can be made to the treatment or management, and if they are successful yields will change. If suitable changes cannot be made to an experiment to ensure its continued relevance to sustainable crop production, then it should be stopped...
January 2018: European Journal of Soil Science
Valentin H Klaus, Till Kleinebecker, Verena Busch, Markus Fischer, Norbert Hölzel, Sascha Nowak, Daniel Prati, Deborah Schäfer, Ingo Schöning, Marion Schrumpf, Ute Hamer
The intensification of land use constitutes one of the main drivers of global change and alters nutrient fluxes on all spatial scales, causing landscape-level eutrophication and contamination of natural resources. Changes in soil nutrient concentrations are thus indicative for crucial environmental issues associated with intensive land use. We measured concentrations of NO3 -N, NH4 -N, P, K, Mg and Ca by using 1326 ion-exchange resin bags buried in 20 cm depth beneath the main root zone in 150 temperate grasslands...
March 11, 2018: Global Change Biology
Jiangpei Han, Liangsheng Shi, Yakun Wang, Zhuowei Chen, Laosheng Wu
Anaerobic batch experiments were conducted to study the regulatory role of endogenous iron in greenhouse gas emissions under intensive nitrogen fertilization in subtropical soils of China. Fe2+ , Fe3+ , and NO3 - -N dynamics and N2 O, CH4 , and CO2 emissions, as well as the relationships between N fertilizer, endogenous iron, and greenhouse gas emissions were investigated. The emissions of N2 O increased to different extents from all the test soils by N1 (260 mg N kg-1 ) application compared with N0. After 24 days of anaerobic incubation, the cumulative emissions of N2 O from red soils in De'an (DR) were significantly higher than that from paddy soils in De'an (DP) and Qujialing (QP) under N1...
March 10, 2018: Environmental Science and Pollution Research International
Siqi Li, Xunhua Zheng, Chunyan Liu, Zhisheng Yao, Wei Zhang, Shenghui Han
Quantifications of soil dissolvable organic carbon concentrations, together with other relevant variables, are needed to understand the carbon biogeochemistry of terrestrial ecosystems. Soil dissolvable organic carbon can generally be grouped into two incomparable categories. One is soil extractable organic carbon (EOC), which is measured by extracting with an aqueous extractant (distilled water or a salt solution). The other is soil dissolved organic carbon (DOC), which is measured by sampling soil water using tension-free lysimeters or tension samplers...
March 7, 2018: Science of the Total Environment
D M S B Dissanayaka, William C Plaxton, Hans Lambers, Meike Siebers, Buddhi Marambe, Jun Wasaki
Orthophosphate (H2 PO4 - , Pi) is an essential macronutrient integral to energy metabolism as well as a component of membrane lipids, nucleic acids, including ribosomal RNA, and therefore essential for protein synthesis. The Pi concentration in the solution of most soils worldwide is usually far too low for maximum growth of crops, including rice. This has prompted the massive use of inefficient, polluting, and non-renewable phosphorus (P) fertilizers in agriculture. We need alternative and more sustainable approaches urgently to decrease complete dependence on Pi fertilizers in agriculture...
March 8, 2018: Plant, Cell & Environment
Katharina M Keiblinger, Franz Zehetner, Axel Mentler, Sophie Zechmeister-Boltenstern
Biochar (BC) application to soils is of growing interest as a strategy to improve soil fertility and mitigate climate change. However, BC-induced alterations in the soil N cycle are currently under debate. BC has recently been shown to accelerate the emissions of N2 O via the biotic ammonium oxidation pathway, which results in lower nitrogen use efficiency and environmentally harmful losses of NO3 and/ or N2 O. To avoid these potential losses, the use of nitrification inhibitor (NI) could provide a useful mitigation strategy for BC-amended agricultural fields...
March 8, 2018: Environmental Science and Pollution Research International
Volker Häring, Delphine Manka'abusi, Edmund K Akoto-Danso, Steffen Werner, Kofi Atiah, Christoph Steiner, Désiré J P Lompo, Samuel Adiku, Andreas Buerkert, Bernd Marschner
A correction to this article has been published and is linked from the HTML and PDF versions of this paper. The error has not been fixed in the paper.
March 8, 2018: Scientific Reports
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