Key Laboratory of Plant Nutrition
Key Laboratory of Plant Nutrition
Wu H.,Northwest University, China |
Wei G.,Northwest University, China |
Tan X.,Hohai University |
Li L.,Jiangxi Normal University |
And 3 more authors.
Scientific Reports | Year: 2017
Copper sulfate is a frequently used reagent for Microcystis blooms control but almost all the previous works have used Microcystis aeruginosa as the target organism to determine dosages. The aim of this study was to evaluate interspecific differences in the responses of various Microcystis species to varying Cu 2+ concentrations (0, 0.05, 0.10, 0.25, and 0.50 mgL-1). The half maximal effective concentration values for M. aeruginosa, M. wesenbergii, M. flos-aquae, and M. viridis were 0.16, 0.09, 0.49, and 0.45 mgL-1 Cu 2+, respectively. This showed a species-dependent variation in the sensitivity of Microcystis species to copper sulfate. Malonaldehyde content did not decrease with increasing superoxide dismutase content induced by increasing Cu 2+, suggesting that superoxide dismutase failed to reduce Cu 2+ damage in Microcystis. Considering the risk of microcystin release when Microcystis membranes are destroyed as a result of Cu 2+ treatment and the stimulation effects of a low level of Cu 2+ on growth in various species, our results suggest that copper sulfate treatment for Microcystis control could be applied before midsummer when M. aeruginosa and M. viridis are not the dominant species and actual amount of Cu 2+ used to control M. wesenbergii should be much greater than 0.10 mgL-1. © The Author(s) 2017.
Liu H.J.,Key Laboratory of Plant Nutrition |
Liu H.J.,Key Laboratory of Plant Soil Interactions |
Liu H.J.,China Agricultural University |
Liu H.J.,ShenYang Agricultural University |
And 10 more authors.
Communications in Soil Science and Plant Analysis | Year: 2010
A pot experiment investigated the effects of iron (Fe) fertilization on cadmium (Cd) uptake by rice seedlings irrigated with Cd solution. Shoot dry weight was significantly affected by Fe addition, and root dry weight was affected by Cd addition. Iron supply was the dominant factor affecting the length of the longest leaf and the soil and plant analyzer development (SPAD) value. Cadmium concentra- tions were much greater in roots than in dithionite-citrate-bicarbonate (DCB) extracts or shoots, and a significant correlation was found between shoot Fe and Cd concentrations. Enhanced Cd uptake observed at high Fe supply implies that enhanced Fe nutrition may counteract the adverse effects of Cd on plants. © Taylor & Francis Group, LLC.
Mi G.H.,Key Laboratory of Plant Nutrition |
Mi G.H.,Key Laboratory of Plant Soil Interaction |
Mi G.H.,China Agricultural University |
Chen F.J.,Key Laboratory of Plant Nutrition |
And 14 more authors.
Science China Life Sciences | Year: 2010
The use of nitrogen (N) fertilizers has contributed to the production of a food supply sufficient for both animals and humans despite some negative environmental impact. Sustaining food production by increasing N use efficiency in intensive cropping systems has become a major concern for scientists, environmental groups, and agricultural policymakers worldwide. In high-yielding maize systems the major method of N loss is nitrate leaching. In this review paper, the characteristic of nitrate movement in the soil, N uptake by maize as well as the regulation of root growth by soil N availability are discussed. We suggest that an ideotype root architecture for efficient N acquisition in maize should include (i) deeper roots with high activity that are able to uptake nitrate before it moves downward into deep soil; (ii) vigorous lateral root growth under high N input conditions so as to increase spatial N availability in the soil; and (iii) strong response of lateral root growth to localized nitrogen supply so as to utilize unevenly distributed nitrate especially under limited N conditions. © 2010 Science China Press and Springer-Verlag Berlin Heidelberg.
Ji P.,Northwest Agriculture and Forestry University |
Ji P.,Key Laboratory of Plant Nutrition |
Qu G.,Northwest Agriculture and Forestry University |
Qu G.,Key Laboratory of Plant Nutrition |
Li J.,Dalian University of Technology
Plasma Science and Technology | Year: 2013
The pentachlorophenol (PCP) adsorbed granular activated carbon (GAC) was treated by dielectric barrier discharge (DBD) plasma. The effects of DBD plasma on the structure of GAC and PCP decomposition were analyzed by N2 adsorption, thermogravimetric, scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS) and gas chromatography-mass spectrometry (GC-MS). The experimental data of adsorption kinetics and thermodynamics of PCP on GAC were fitted with different kinetics and isotherm models, respectively. The results indicate that the types of N2 adsorption isotherm of GAC are not changed by DBD plasma, while the specific surface area and pore volume increase after DBD plasma treatment. It is found that the weight loss of the saturated GAC is the highest, on the contrary, the weight loss of DBD treated GAC is the least because of reduced PCP residue on the GAC. The XPS spectra and SEM image suggest that some PCP on the GAC is removed by DBD plasma, and the surface of GAC treated by DBD plasma presents irregular and heterogeneous morphology. The GC-MS identification of by-products shows that two main dechlorination intermediate products, tetra-chlorophenol and trichlorophenol, are distinguished. The fitting results of experimental data of adsorption kinetics and thermodynamics indicate that the pseudo-first-order and pseudo-second order models can be used for the prediction of the kinetics of virgin GAC and DBD treated GAC for PCP adsorption, and the Langmuir isotherm model fits better with the data of adsorption isotherm than the Freundlich isotherm in the adsorption of PCP on virgin GAC and DBD treated GAC.
Qu G.,Northwest University, China |
Qu G.,Key Laboratory of Plant Nutrition |
Liang D.,Northwest University, China |
Liang D.,Key Laboratory of Plant Nutrition |
And 5 more authors.
Plasma Science and Technology | Year: 2014
In this study, two regeneration methods (dielectric barrier discharge (DBD) plasma and ozone (O3) regeneration) of saturated granular activated carbon (GAC) with pentachlorophenol (PCP) were compared. The results show that the two regeneration methods can eliminate contaminants from GAC and recover its adsorption properties to some extent. Comparing the DBD plasma with O 3 regeneration, the adsorption rate and the capacity of the GAC samples after DBD plasma regeneration are greater than those after O3 regeneration. O3 regeneration decreases the specific surface area of GAC and increases the acidic surface oxygen groups on the surface of GAC, which causes a decrease in PCP on GAC uptake. With increasing regeneration cycles, the regeneration efficiencies of the two methods decrease, but the decrease in the regeneration efficiencies of GAC after O3 regeneration is very obvious compared with that after DBD plasma regeneration. Furthermore, the equilibrium data were fitted by the Freundlich and Langmuir models using the non-linear regression technique, and all the adsorption equilibrium isotherms fit the Langmuir model fairly well, which demonstrates that the DBD plasma and ozone regeneration processes do not appear to modify the adsorption process, but to shift the equilibrium towards lower adsorption concentrations. Analyses of the weight loss of GAC show that O3 regeneration has a lower weight loss than DBD plasma regeneration.
Liang B.,Northwest University, China |
Liang B.,Qingdao Agricultural University |
Zhao W.,Northwest University, China |
Zhao W.,Key Laboratory of Plant Nutrition |
And 4 more authors.
Field Crops Research | Year: 2013
High soil organic matter content may improve synchronization between N supply and crop demand. To test this hypothesis, we compared the fate of 15N-labeled fertilizer in soil with different management history. The soils had received no fertilizer (No-F soil), inorganic N, P, and K fertilizer (NPK soil), or manure plus N, P, and K fertilizer (MNPK soil) as part of a 19-year long-term fertilization trial. The N use efficiency (NUE) of wheat (Triticum aestivum L.) was 62% in the MNPK soil, higher than that in the NPK soil (50% NUE), and in the No-F soil (13% NUE). At wheat harvest, 38% of the fertilizer 15N remained in the 0-100cm depth of the MNPK soil, significantly less that the amount of fertilizer 15N that remained in the NPK soil (45%) or in the No-F soil (88%). More than 50% of the fertilizer 15N in the No-F soil had leached below the 20cm depth by wheat harvest, significantly more than in the NPK or MNPK soils. The amount of immobilized 15N at wheat stem elongation was significantly (P<0.05) greater in the MNPK soil than in the NPK soil. The mineralization of immobilized 15N between stem elongation and flowering was also significantly higher in the MNPK soil than in the NPK soil (P<0.05). The succeeding maize (Zea mays L.) crop took up 9% of the fertilizer 15N in the No-F soil, 6% of the fertilizer 15N in the NPK soil, and 2% of the fertilizer 15N in the MNPK soil. Combined soil profile and crop removal analyses at wheat harvest accounted for nearly 100% of the fertilizer 15N for all three soils. However, only 45% of the fertilizer 15N added to the No-F soil could be accounted for at maize harvest, significantly less than the recovery rate in the NPK (83%) and MNPK (85%) soils (P<0.01). These results indicate that the fertilizer 15N was mainly lost from these soils during the maize growing season. We conclude that the combined application of manure and inorganic fertilizers improves synchrony between N supply and crop demand, thus reducing N losses from agriculture. © 2012 Elsevier B.V.
Li R.,Northwest University, China |
Li R.,Key Laboratory of Plant Nutrition |
Wang Q.,Northwest University, China |
Zhang Z.,Northwest University, China |
And 5 more authors.
Environmental Technology (United Kingdom) | Year: 2015
The effects of the corn stalk charred biomass (CB) prepared at different pyrolysis temperatures as additives on nutrient transformation during aerobic composting of pig manure were investigated. The results showed that the addition of CB carbonized at different temperatures to pig manure compost significantly influenced the compost temperature, moisture, pH, electrical conductivity, organic matter degradation, total nitrogen, and NH3 variations during composting. Compared with control and adding CB charred at lower temperature treatments, the addition of CB prepared over 700°C resulted in higher pH (over 9.2) and NH3 emission and lower potherb mustard seed germination index value during the thermophilic phase. Peak temperatures of composts appeared at 7 days for control and 11 days for CB added treatments. During 90 days composting, the organic matter degradation could be increased over 14.8-29.6% after adding of CB in the compost mixture. The introduction of CB in pig manure could prolong the thermophilic phase, inhibit moisture reduce, facilitate the organic matter decomposition, reduce diethylene triamine pentaacetic acid (DTPA) extractable Zn and Cu contents in pig manure composts and increase ryegrass growth. The study indicated that the corn stalk CB prepared around 500°C was a suitable additive in pig manure composting. © 2014 Taylor and Francis.
Qi Y.,Northwest Agriculture and Forestry University |
Qi Y.,Key Laboratory of Plant Nutrition |
Huang B.,CAS Nanjing Institute of Soil Science |
Darilek J.L.,CAS Nanjing Institute of Soil Science
PLoS ONE | Year: 2014
An understanding of how redox conditions affect soil heavy metal fractions in rice paddies is important due to its implications for heavy metal mobility and plant uptake. Rice paddy soil samples routinely undergo oxidation prior to heavy metal analysis. Fraction distribution of Cu, Pb, Ni, and Cd from paddy soil with a wide pH range was investigated. Samples were both dried according to standard protocols and also preserved under anaerobic conditions through the sampling and analysis process and heavy metals were then sequentially extracted for the exchangeable and carbonate bound fraction (acid soluble fraction), iron and manganese oxide bound fraction (reducible fraction), organic bound fraction (oxidizable fraction), and residual fraction. Fractions were affected by redox conditions across all pH ranges. Drying decreased reducible fraction of all heavy metals. Curesidual fraction, Pboxidizable fraction, Cdresidual fraction, and Niresidual fraction increased by 25%, 33%, 35%, and >60%, respectively. Pbresidual fraction, Niacid soluble fraction, and Cdoxidizable fraction decreased 33%, 25%, and 15%, respectively. Drying paddy soil prior to heavy metal analysis overestimated Pb and underestimated Cu, Ni, and Cd. In future studies, samples should be stored after injecting N2 gas to maintain the redox potential of soil prior to heavy metal analysis, and investigate the correlation between heavy metal fraction distribution under field conditions and air-dried samples. © 2014 Qi et al.
PubMed | Key Laboratory of Plant Nutrition
Type: Journal Article | Journal: Science China. Life sciences | Year: 2010
The use of nitrogen (N) fertilizers has contributed to the production of a food supply sufficient for both animals and humans despite some negative environmental impact. Sustaining food production by increasing N use efficiency in intensive cropping systems has become a major concern for scientists, environmental groups, and agricultural policymakers worldwide. In high-yielding maize systems the major method of N loss is nitrate leaching. In this review paper, the characteristic of nitrate movement in the soil, N uptake by maize as well as the regulation of root growth by soil N availability are discussed. We suggest that an ideotype root architecture for efficient N acquisition in maize should include (i) deeper roots with high activity that are able to uptake nitrate before it moves downward into deep soil; (ii) vigorous lateral root growth under high N input conditions so as to increase spatial N availability in the soil; and (iii) strong response of lateral root growth to localized nitrogen supply so as to utilize unevenly distributed nitrate especially under limited N conditions.