Key Laboratory of Plant Nutrition and Fertilizer in South Region
Key Laboratory of Plant Nutrition and Fertilizer in South Region
Yi Q.,Guangdong Academy of Agricultural Sciences |
Yi Q.,Key Laboratory of Plant Nutrition and Fertilizer in South Region |
Yi Q.,Guangdong Key Laboratory of Nutrient Cycling and Farmland Conservation |
Yi Q.,South China Agricultural University |
And 16 more authors.
PLoS ONE | Year: 2017
Globally, vegetable fields are the primary source of greenhouse gas emissions. A closedchamber method together with gas chromatography was used to measure the fluxes of nitrous oxide (N2O) emissions in typical vegetable fields planted with four vegetables sequentially over time in the same field: endive, lettuce, cabbage and sweet corn. Results showed that N2O fluxes occurred in pulses with the N2O emission peak varying greatly among the crops. In addition, N2O emissions were linearly associated with the nitrogen (N) application rate (r = 0.8878, n = 16). Excessive fertilizer N application resulted in N loss through nitrous oxide gas emitted from the vegetable fields. Compared with a conventional fertilization (N2) treatment, the cumulative N2O emissions decreased significantly in the growing seasons of four plant species from an nitrogen synergist (a nitrification inhibitor, dicyandiamide and biochar treatments by 34.6% and 40.8%, respectively. However, the effects of biochar on reducing N2O emissions became more obvious than that of dicyandiamide over time. The yield-scaled N2O emissions in consecutive growing seasons for four species increased with an increase in the N fertilizer application rate, and with continuous application of N fertilizer. This was especially true for the high N fertilizer treatment that resulted in a risk of yield-scaled N2O emissions. Generally, the additions of dicyandiamide and biochar significantly decreased yield-scaled N2O-N emissions by an average of 45.9% and 45.7%, respectively, compared with N2 treatment from the consecutive four vegetable seasons. The results demonstrated that the addition of dicyandiamide or biochar in combination with application of a rational amount of N could provide the best strategy for the reduction of greenhouse gas emissions in vegetable field in south China. © 2017 Yi et al.This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Li Y.L.,Guangdong Academy of Agricultural Sciences |
Li Y.L.,Key Laboratory of Plant Nutrition and Fertilizer in South Region |
Liu Z.Z.,Guangdong Academy of Agricultural Sciences |
Huang Y.F.,Guangdong Academy of Agricultural Sciences |
And 8 more authors.
Advanced Materials Research | Year: 2014
Enantioselective partitioning of racemic omeprazole enantiomers was studied using a biphasic recognition chiral extraction system. Hydrophilic hydroxypropyl-β-cyclodextrin in aqueous phase and hydrophobic D-tartaric acid hexyl ester in organic phase as chiral selectors which preferentially recognize (R)-omeprazole enantiomer and (S)-omeprazole enantiomer, respectively. Different experimental variable parameters could affect the chiral extraction efficiency. The largest distribution coefficients kS, kR and separation factor α were obtained at concentrations o f 0.1 mol/L HP-β-CD and 0.2 mol/L D-tartaric acid hexyl ester, which were 47.38, 58.65 and 1.24, respectively. kR is always larger than kS when using different kinds of tartaric acid derivatives as chiral selectors in organic phase. The present study also reveal the mechanism of biphasic recognition chiral extraction for R,S-omeprazole enantiomers. © (2014) Trans Tech Publications, Switzerland.
Huang L.,Guangdong Academy of Agricultural Sciences |
Huang L.,Key Laboratory of Plant Nutrition and Fertilizer in South Region |
Huang L.,Guangdong Key Laboratory of Nutrient Cycling and Farmland Conservation |
Yao L.,South China Agricultural University |
And 13 more authors.
Chemosphere | Year: 2014
Roxarsone is an organoarsenic feed additive which can be finally degraded to other higher toxic metabolites after excreted by animal. In this work, the uptake of As species by vegetables treated with chicken manure bearing roxarsone and its metabolites was investigated. It was showed that more than 96% of roxarsone added in chicken feed was degraded and converted to arsenite, monomethylarsonic acid, dimethylarsinic acid, arsenate, 4-hydroxyphenylarsonic acid and other unknown As species. Arsenite and arsenate could be found in roots of vegetables but only arsenite transported up to shoots. Chicken manure bearing roxarsone and its metabolites increased 33-175% of arsenite and 28%~seven times of arsenate in vegetable roots, 68-175% of arsenite in edible vegetable shoots. Arsenite, the most toxic As form, was the major extractable As species in vegetables accounted for 79-98%. The results reflected that toxic element As could be absorbed by vegetables via the way: roxarsone in feed. →. animal. →. animal manure. →. soil. →. crop and the uptake of As species would be enhanced by using chicken manure bearing roxarsone and its metabolites as organic fertilizer. © 2014 Elsevier Ltd.
Xie K.,Guangdong Academy of Agricultural Sciences |
Xie K.,Key Laboratory of Plant Nutrition and Fertilizer in South Region |
Xie K.,Guangdong Key Laboratory of Nutrient Cycling and Farmland Conservation |
Xu P.,Guangdong Academy of Agricultural Sciences |
And 20 more authors.
Journal of Microbiology and Biotechnology | Year: 2015
Cold water paddy field soils are relatively unproductive, but can be ameliorated by supplementing with inorganic fertilizer from animal waste-based composts. The yield of two rice cultivars was significantly raised by providing either chicken manure or cow dung-based compost. The application of these composts raised the soil pH as well as both the total nitrogen and ammonium nitrogen content, which improved the soil’s fertility and raised its nitrification potential. The composts had a measurable effect on the abundance of nitrogencycling- related soil microbes, as measured by estimating the copy number of various bacterial and archaeal genes using quantitative real-time PCR. The abundance of ammonia oxidizing archaea and bacteria was markedly encouraged by the application of chicken manure-based compost. Supplementation with the composts helped promote the availability of soil nitrogen in the cold water paddy field, thereby improving the soil’s productivity and increasing the yield of the rice crop. © 2015 by The Korean Society for Microbiology and Biotechnology.
Tu Y.,Guangdong Academy of Agricultural Sciences |
Tu Y.,Key Laboratory of Plant Nutrition and Fertilizer in South Region |
Tu Y.,Guangdong Key Laboratory of Nutrient Cycling and Farmland Conservation |
Huang J.,Guangdong Academy of Agricultural Sciences |
And 14 more authors.
BioResources | Year: 2016
Nutrients were extracted from corn stalks, peanut shells, de-oiled peanut meal, chicken manure, and sewage sludge by a subcritical water (SCW) hydrolysis reaction. Compared with the other feedstock, the aqueous phases extracted from de-oiled peanut meal showed the highest water-soluble organic carbon, amino acid, total nitrogen, and phosphorus contents. The effects of solution pH, final hydrothermal temperature, and reaction time on nutrient extraction from de-oiled peanut meal were investigated. The analysis showed that alkaline reagents promoted liquefaction. The highest yield of the total primary nutrients (82.6%) was obtained with extraction reaction at 180 °C for 1.5 h using 0.1 mol/L KOH. The liquid fraction from this reaction was investigated for its potential use as a fertilizer with germination experiments. A higher germination index and root activity were obtained using the liquid extract with the appropriate dilution. These results indicated that subcritical water hydrothermal treatment is a viable way to recover nutrients from biomass wastes. In addition, de-oiled peanut meal is a suitable feedstock for the production of nutrient-rich liquid extract.