198 results about "Ammonium nitrogen" patented technology

The invention relates to the field of fertilizers, in particular to a macroelement water-soluble fertilizer and a preparation method thereof.The preparation method comprises the steps that a composite biochar material is prepared from biochar, loaded metal modified biochar and an iron metal material, and then the composite biochar material is compounded with tripotassium phosphate, monopotassium phosphate, disodium octoborate tetrahydrate, zinc sulfate monohydrate and the like; the finally prepared fertilizer can realize accurate fertilizer supply, the iron metal organic framework material efficiently converts nitrate nitrogen into ammonium nitrogen and cooperates with a large amount of trace elements such as tripotassium phosphate, the requirements of crops at all stages are met, nutrients in key periods are guaranteed, pores of the composite biochar material adsorb the nutrients, nutrient slow release is realized, root system interpenetration resistance is reduced, stress resistance is enhanced, and the yield of the crops is increased. The soil conditioner has the advantages of simple preparation process, reduction of growth hindrance, optimization of soil aggregates, increase of pores, reduction of volume weight, improvement of ventilation, water permeability and water and fertilizer retention capabilities, substantial agricultural economy energization, substantial yield increase of crops, and wide application prospects.

The invention provides an application of protozoa nephroplasmosis NJAU-Z2 in promoting banana growth and preventing and controlling fusarium wilt. The protozoa kidney-shaped worm NJAU-Z2 with the preservation number of CCTCC (China Center For Type Culture Collection) NO: C2024242 is applied to improvement of the content of ammonium nitrogen in soil, promotion of banana growth and prevention and treatment of banana fusarium wilt. A pot experiment shows that the kidney-shaped worm NJAU-Z2 can improve the content of ammonium nitrogen in soil, remarkably promote the growth of banana plants and improve the biomass of the banana plants. Indoor experiments find that the kidney-shaped worm NJAU-Z2 can directly inhibit growth of pathogenic bacteria fusarium oxysporum of banana wilt, and pot experiments prove that the kidney-shaped worm NJAU-Z2 has a good prevention and control effect on the banana wilt. Development and application of the beneficial protozoa are important agricultural measures for realizing efficient prevention and control of soil-borne diseases and green and sustainable development of agriculture.

The invention discloses an application of pore protein PorA in improving ammonia nitrogen utilization capacity of methane-oxidizing bacteria. The amino acid sequence of the pore protein PorA is as shown in SEQ ID NO. 1. The nucleotide sequence of the coding gene porA of the pore protein PorA is as shown in SEQ ID NO. 2. The invention also relates to an application of the pore protein PorA in the aspect of improving the utilization capability of Methyluvimicrobium burylate ammonium nitrogen, and particularly relates to an application of the pore protein PorA in the aspect of improving the utilization capability of Methyluvimicrobium burylate ammonium nitrogen. The porous protein is inactivated, so that the methane-oxidizing bacterium Methyluvimicrobiuretic can grow by utilizing ammonium nitrogen, the cost of fermenting and culturing the bacterium is reduced, and the porous protein has important significance on industrial application of the bacterium.

The invention belongs to the field of environmental microorganisms, and discloses a high-temperature-resistant efficient nitrosation complex microbial inoculant and an application of the high-temperature-resistant efficient nitrosation complex microbial inoculant in aerobic composting of livestock and poultry manure, and the complex microbial inoculant comprises bacillus firmus CCTCC M 20241091, vinca bacillus CCTCC M 20241092, and achromobacter xylosus CCTCC M 2024620. The compound strain can accelerate conversion of ammonium nitrogen into nitrite nitrogen during aerobic composting of livestock and poultry manure, so that the amount of NH4 < + >-N converted into NH3 in the composting process is reduced, and nitrogen loss caused by volatilization of ammonia gas is reduced. The nitrosobacteria agent has the advantages of high conversion efficiency, simple operation and no secondary pollution, and is an effective method for reducing nitrogen loss and ammonia volatilization in the aerobic composting process.

The invention relates to the technical field of sustained and controlled release fertilizers, in particular to a soil-improving disease-resistant sustained and controlled release fertilizer and a preparation method thereof. The preparation method comprises the following steps: (1) preparation of the nutrient core: weighing an organic fertilizer, an ammonium nitrogen fertilizer, a phosphate fertilizer, a potash fertilizer, a biological regulator, chelated medium trace elements and modified attapulgite, uniformly mixing, and granulating to obtain the nutrient core; (2) covering an organic polymer coating layer: dissolving polylactic acid in a solvent to form a composite solution, spraying the composite solution on the surface of the nutrient core, and drying to obtain an organic polymer coated nutrient core; and (3) covering a mineral coating layer. The outermost layer of the soil-improving disease-resistant controlled-release fertilizer provided by the invention is the mineral coating layer, the mineral coating layer can be gradually disintegrated after being applied to soil, mineral components can improve the physical structure of the soil, regulate the acid-base property of the soil and increase the content of organic matters in the soil after entering the soil, and inorganic and organic nutrients are slowly released into the soil through the organic polymer coating layer; nutrient substances are continuously supplied, and common diseases of the corn are prevented and controlled.

The invention discloses a novel application of bacillus subtilis WJL-2, and relates to the technical field of microorganisms. The invention discloses a novel application of bacillus subtilis WJL-2. The preservation number of the bacillus subtilis WJL-2 is GDMCC65111, and the preservation number of the bacillus subtilis WJL-2 is GDMCC65111. The new application specifically comprises the following steps: improving soil, regulating and controlling the content of total nitrogen and organic carbon in the soil, regulating and controlling the activity of amylase / urease / cellulase in the soil, regulating and controlling the content of ammonium nitrate nitrogen in the soil, regulating and controlling the mineralization rate of the soil, regulating and controlling the nitration rate of the soil and regulating and controlling the ammoniation rate of the soil. After the strain WJL-2 is inoculated into the soil, the total nitrogen and organic carbon content of the soil is reduced, and the C / N is reduced; the activity of soil amylase is reduced, and the activity of urease and cellulase is increased; the content of ammonium nitrogen in the soil is in a trend of firstly increasing and then decreasing, and the content of nitrate nitrogen is continuously increased; the mineralization rate of soil organic nitrogen is accelerated, the ammoniation rate is in a trend of increasing first and then decreasing, and the nitration rate is in a trend of decreasing first and then increasing.

The present invention discloses a heterotrophic nitrifying Brevundimonas DB‑4 and its application, belonging to the field of microbial technology. The heterotrophic nitrifying Brevundimonas (Brevundimonas) DB‑4 was deposited in the General Microbiological Center of the China Microbiological Culture Collection Administration Committee on December 11, 2023, with a deposit number of CGMCC No.29279. The Brevundimonas DB‑4 provided by the present invention is derived from the decomposed matter of the mixed compost of bean cake and vegetable cypress, has a strong heterotrophic nitrification ability, can promote the conversion of ammonium nitrogen in the rhizosphere soil to nitrate nitrogen, and can effectively colonize in the soil, increase the nitrate nitrogen content in the soil and plants; at the same time, it has the ability to depotassium, thereby increasing the content of available potassium in the rhizosphere soil, can promote the improvement of crop quality, and can be widely used in the preparation of microbial fertilizers to improve the nitrogen conversion efficiency of fertilizers and reduce the application of chemical fertilizers.

The invention relates to a method for reducing nitrate nitrogen in wastewater into ammonia nitrogen by using a double-bacterium inoculant and application of the double-bacterium inoculant. The method comprises the following steps: respectively carrying out expanding culture, washing and resuspending on electron donating bacteria and dissimilatory nitrate reduction ammonium-producing bacteria, and then mixing in a co-culture medium for co-culture to form a double-bacteria microbial inoculum; the co-culture medium containing the double-bacterium agent is introduced into wastewater to be treated, and nitrate nitrogen in the wastewater is reduced into ammonia nitrogen in an anaerobic environment. According to the method, nitrate nitrogen in the wastewater can be reduced and converted into energy storage substances with high energy density, the problems of low utilization rate of ammonium nitrogen fertilizer and non-point source pollution can be solved, and the method has important value for nitrogen pollution control and agricultural green sustainable development.

The invention belongs to the technical field of biological fertilizers, and particularly provides a carbon sequestration and nitrogen conservation biological organic fertilizer and a preparation method thereof.Molybdenum, copper, cobalt and composite flora are loaded on biomass charcoal to prepare load type biomass charcoal; and jointly preparing the supported biomass charcoal, the perilla biomass extracting solution and animal waste into the biological organic fertilizer. According to the biological organic fertilizer provided by the invention, unnecessary waste of strain resources can be avoided, and the organic fertilizer can remarkably promote the immobilization effect of soil on ammonium nitrogen and nitrate nitrogen; the compound bacteria liquid promotes decomposition of organic matters and effectiveness of nutrients, and promotes improvement of soil, so that improvement of soil productivity is facilitated; meanwhile, the organic fertilizer can obviously improve the enzyme activity of the soil and promote the improvement of the fertility of the soil, so that the effect of conditioning the soil is finally realized.

The invention provides a soil ammonium nitrogen content hyperspectral prediction method based on an improved extreme learning machine, and relates to the technical field of hyperspectral prediction. The method comprises the following steps: firstly, collecting and treating a soil sample for soil spectral measurement and NH4 < + >-N content determination; measuring soil spectral reflectivity data; preprocessing the soil spectral reflectivity data to form a spectral reflectivity data set; then carrying out characteristic wave band selection by adopting a sequential forward selection algorithm; an improved butterfly optimization algorithm IBOA is adopted to optimize model parameters of an extreme learning machine ELM, and then a hyperspectral prediction model used for predicting the NH4 < + >-N content of the soil is constructed; and finally, the ELM model after parameter optimization is selected to construct a hyperspectral prediction model to predict the NH4 < + >-N content. The method not only provides theoretical and technical support for soil ammonium nitrogen content monitoring, but also provides important reference and guidance for soil nitrogen cycle research and soil management.

The invention relates to the field of water-soluble fertilizers special for sweet cherries, and discloses a water-soluble fertilizer special for sweet cherries and a preparation and application method thereof.The water-soluble fertilizer special for sweet cherries comprises a drip irrigation fertilizer barrel A, a drip irrigation fertilizer barrel B, a drip irrigation fertilizer barrel C and a drip irrigation fertilizer barrel D, the drip irrigation fertilizer barrel C takes glycine, glutamic acid and glucose as cores to chelate metal ions; the fertilizer barrel A contains fulvic acid, nitrate nitrogen, potassium, molybdenum, zinc and a chelated iron element; the fertilizer barrel B contains ammonium polyphosphate, ammonium nitrogen, phosphorus, sulfur, manganese, boron and magnesium elements; the fertilizer C barrel comprises glycine, glutamic acid, glucose, amide nitrogen, nitrate nitrogen, calcium and copper. Compared with the prior art, the special water-soluble fertilizer disclosed by the invention has the advantages that formula design can be systematically and accurately carried out according to the growth cycle characteristics of the large cherries, and meanwhile, the problem of element antagonism is effectively solved.

The invention discloses modified biochar for preventing and controlling soil nitrogen loss and a preparation method thereof, and the preparation method comprises the following steps: 1) adding a FeSO4 solution into biochar; 2) adding dilute sulphuric acid into the mixed solution obtained in the step 1), and uniformly mixing; (3) oscillating and heating the mixed solution treated in the step (2); 4) centrifuging the mixed solution treated in the step 3), and repeatedly washing the precipitate with deionized water; and (5) putting the centrifuged precipitate obtained in the step (4) into an electrothermal blowing drying box, and drying at 105 DEG C until the weight is constant. According to the invention, after the ferrous modified biochar is applied to soil, the pH value, EC value and CEC value of the soil are increased, the volume weight (VW) of the soil is reduced, and the contents of carbon, nitrogen and phosphorus nutrients in the soil are increased. According to the method disclosed by the invention, the leaching loss of nitrate nitrogen and ammonium nitrogen in the soil is remarkably inhibited by adding the modified biochar. The method has the advantages of easily available raw materials, no pollution, low treatment cost, convenient operation, large-scale application, high economy, and suitableness for popularization and application in the industry.

The invention discloses a bacterial strain for reducing dissimilatory nitrate into ammonia nitrogen through anaerobic biodegradation of polycyclic aromatic hydrocarbon and application of the bacterial strain, the bacterial strain is named as PheICNA, and the bacterial strain belongs to Intraporum calvum. The strain is preserved in the China General Microbiological Culture Collection Center (CGMCC), and the preservation number is CGMCC No.40686. The strain can degrade polycyclic aromatic hydrocarbons such as phenanthrene under anaerobic conditions and completely metabolize the polycyclic aromatic hydrocarbons into carbon dioxide. Meanwhile, nitrate radicals are reduced into ammonium nitrogen, and the generated ammonium nitrogen can be used for growth of microorganisms and can be used as a nitrogen source for plants. The strain can be used for biologically repairing polycyclic aromatic hydrocarbon pollutants such as phenanthrene in soil, can convert nitrate nitrogen in the soil into ammoniacal nitrogen at the same time, achieves the effect of nitrogen maintenance, and has good application prospects in the aspects of polluted soil treatment and the like.

The invention discloses a sea-land interaction zone underground water pollution source tracing method based on multi-pollutant fingerprints, and the method comprises the steps: constructing a fingerprint feature library of eight key pollutants including cadmium, arsenic, nitrate nitrogen, ammonium nitrogen, phosphate, total petroleum hydrocarbon, sulfamethoxazole, pH value and the like; statistical characteristic models of four pollution sources of industrial emission, agricultural non-point sources, oil exploitation and aquaculture are established, Z-Score standardization and a similarity calculation method based on a standard normal distribution probability density function are adopted, comprehensive similarity evaluation is performed in combination with a risk weight distribution mechanism, a similarity threshold value of 0.7 is set to perform pollution source identification and sorting, and the pollution sources are identified and sorted according to the similarity threshold value. And correction is performed by considering environmental factors such as tide, season and geology of a sea-land interaction zone. The method can quickly and accurately recognize the groundwater pollution source of the sea-land interaction zone, the traceability accuracy rate reaches 80% or above, and scientific and technical support is provided for prevention and control of groundwater pollution of the sea-land interaction zone and formulation of an environmental protection policy.

The invention discloses a plant growth-promoting rhizobacteria and application thereof, and relates to the technical field of agricultural microorganisms. The strain is named as serratia sp. SYPP26, the strain is preserved in the Guangdong Microbial Culture Collection Center, the preservation number is GDMCC NO: 64911, and the preservation date is July 24, 2024, and the strain is named as serratia sp. SYPP26. The strain is named as serratia sp. SYPP26 and is preserved in the Guangdong Microbial Culture Collection Center, the preservation number is GDMCC NO: 64911. The strain is separated from the rhizosphere soil environment of the high-yield rubber tree, is high in environmental adaptability, keeps good growth consistency when the salt concentration is 1-7%, the temperature is 20-30 DEG C and the pH is 3.5-9.0, and can adapt to most of acid soil in the southern China; the strain has the capabilities of dissolving phosphorus, producing siderophores, producing indoleacetic acid, producing gibberellin, producing ammonia and the like, and experiments prove that the strain has the capability of improving the content of ammonium nitrogen and nitrate nitrogen in soil, and can improve the germination rate of rice seeds and remarkably promote plant growth and root development.

The invention discloses an application method for realizing rice nitrogen fertilizer substitution by utilizing a photocatalytic nitrogen fixation material in the technical field of agricultural production. The application method comprises the following steps: S1, pretreating and proportioning a catalyst; s2, reaction container deployment and illumination optimization; s3, carrying out photocatalytic reaction and ammonium nitrogen generation; s4, synergistically applying base fertilizer and additional fertilizer; s5, monitoring and feeding back nitrogen utilization efficiency; the performance of the photocatalyst is improved by adopting a surface doping and composite modification technology, atmospheric nitrogen can be stably and efficiently converted into ammonium nitrogen which can be directly absorbed by rice under a complex environmental condition, and the nitrogen conversion rate and the nitrogen supply efficiency are improved; the AI algorithm is combined with the chlorophyll meter, the soil nitrogen sensor and the water ammonia nitrogen concentration data to predict and dynamically adjust the nitrogen demand of the rice in real time; a closed loop of nitrogen fixation-conversion-absorption-recovery is formed through a segmented application strategy of base fertilizer and topdressing in combination with physical and chemical synergism and a biochar improvement technology.

The invention relates to the technical field of agricultural fertilizers, in particular to an enzymolysis fish protein type amino acid-containing water-soluble fertilizer and a preparation method thereof, the fertilizer is prepared from 50-70% of enzymolysis fish protein stock solution and other components; the stock solution is prepared by pulping aquatic product processing leftovers, adjusting the pH value to 6.5-7.5, adding specific compound protease for enzymolysis, and performing enzyme deactivation and centrifugation; the macroelement liquid contains nitrate nitrogen and ammonium nitrogen (2: 1-4: 1), and the microelement chelating agent is prepared by reacting a stock solution small molecule peptide with a specific salt. The fish protein enzymolysis stock solution is prepared from aquatic product processing leftovers, high-proportion small molecule peptide and amino acid are obtained through specific enzymolysis and other processes, and by matching with high-content macroelements in a specific nitrogen form, nutrition can be rapidly supplemented, and crop photosynthesis and dry matter accumulation can be improved; and moreover, all the components cooperate to regulate the growth of the crops and improve the stress resistance, and the surfactant also improves the utilization rate of the fertilizer and reduces waste.

The invention discloses a porous ceramic modified water and fertilizer retention material as well as a preparation method and application thereof. The porous ceramic modified water and fertilizer retention material comprises porous ceramic balls and an organic modifier compounded with the porous ceramic balls, the organic modifier comprises one or more of chitosan and hexadecyl trimethyl ammonium bromide; the modified porous ceramic is obtained by selecting the modifier chitosan and / or hexadecyl trimethyl ammonium bromide and blending the components of the porous ceramic, the water and fertilizer retention performance of the porous ceramic is improved, the production cost is reduced, the problems of high cost and difficult degradation of a plant water and fertilizer retention material are solved, the static adsorption capacity on an ammonium nitrogen fertilizer is improved by 60%, and the application prospect is wide. The release speed of the adsorbed fertilizer within 24 hours can be slowed down, and the environment-friendly significance is achieved.

The invention provides an astragalus mongholicus residue biochar-loaded microbial inoculant and a preparation method and application thereof.The preparation method comprises the steps that an Enterobacter mori XJ 10 inoculant is cultured firstly, then modified biochar is obtained through high-temperature pyrolysis of astragalus mongholicus residues and modification of industrial brown sugar, the modified biochar and the astragalus mongholicus residues are mixed according to the proportion, oscillated adsorption and vacuum drying are conducted, and the biochar-loaded functional inoculant is obtained. When the Cd-Pb composite contaminated soil is remediated by applying the microbial inoculum and the king grass cooperatively, compared with a contaminated control group (CK-2), the plant height, the stem diameter and the biomass of the king grass are increased by about 119.3%, 116.7% and 53.8% respectively, and the biomass is 9.8% higher than that of original soil (CK-1); ammonium nitrogen, nitrate nitrogen, available phosphorus and quick-acting potassium in the soil are increased by 255%, 892.6%, 203.5% and 301.6% respectively; and the Cd removal rate and the Pb removal rate are respectively increased by about 24.5% and 24.3%. Resource utilization of the radix astragali residues is achieved, a'charcoal-fungicide-king grass' synergistic system breaks through the limitation of a single remediation technology, pollution remediation and soil fertility improvement are both considered, and the method has the advantages of being low in cost, efficient and sustainable.

The invention belongs to the technical field of agriculture, and provides synergistic urea as well as a preparation method and application thereof. The synergistic urea provided by the invention comprises the following components in percentage by weight: 98.8 to 99.7 percent of urea and 0.3 to 1.2 percent of synergist (comprising polyaspartic acid, zinc iminodisuccinate and mannan oligosaccharide). When the synergistic urea is applied to soil, compared with urea, the synergist permeates into the soil preferentially, and polyaspartic acid can adsorb the urea and ammonium nitrogen and nitrate nitrogen converted from the urea, so that the nitrogen fixation effect is achieved, and the loss of nitrogen is reduced. Meanwhile, the polyaspartic acid, the zinc iminodisuccinate and the mannan oligosaccharide act together, so that the growth of crop roots can be promoted, the demand of the crop roots on nitrogen is improved, and the absorption of the crops on nitrogen in the soil is improved. Besides, the polyaspartic acid, the zinc iminodisuccinate and the mannan oligosaccharide act together, so that the activity of enzymes in crops can be improved, the crops can efficiently utilize low-concentration nitrogen, and the effective utilization rate of nitrogen is increased.

The invention discloses a method for predicting soil ammonium nitrogen pollution space in a rare earth mining area. Based on a spatial layering heterogeneity theory and a Bayesian theory, a spatial interpolation technology is combined, and an innovative layering Bayesian three-dimensional curved surface mean value model is provided. According to the model, layered modeling is introduced for the situation that pollutants in the rare earth mining area have high heterogeneity in the vertical direction, that is, the pollutants are subjected to layered treatment according to different depths, non-homogeneous distribution of the pollutants in different depth layers is captured, and the distribution difference of the pollutants in different stratums can be reflected more accurately.

The invention discloses application of catechin as a nitrification inhibitor, a use method of catechin as a nitrification inhibitor, a preparation method of a fertilizer formed by the catechin and the fertilizer. According to indoor simulation and field plot and field experiments, the catechin shows a good inhibition effect on soil ammonia oxidizing bacteria when the dosage per mu is 40.0-100.0 g, conversion from ammonium nitrogen to nitrate nitrogen can be effectively delayed, and compared with a traditional nitrification inhibitor, the catechin has the advantage in the later stage of nitrification inhibition.

The invention discloses a nitrogenous fertilizer for cigars, a fertilizer and application. A nitrogenous fertilizer for cigars comprises a nitrate nitrogenous fertilizer and an ammonium nitrogenous fertilizer, and the molar ratio of the nitrate nitrogenous fertilizer to the ammonium nitrogenous fertilizer is (0.66-1.50): 1. The nitrate nitrogen fertilizer is potassium nitrate and / or calcium nitrate, and the ammonium nitrogen fertilizer is ammonium bicarbonate. The molar ratio of the nitrate nitrogen fertilizer to the ammonium nitrogen fertilizer is 1: 1. The invention also provides a fertilizer for cigars. The fertilizer comprises any nitrogen fertilizer for cigars. The fertilizer comprises the following components in parts by weight: 20-60 parts of decomposed oil cake, 20-40 parts of nitrogen fertilizer, 10-30 parts of phosphate fertilizer and 30-60 parts of potash fertilizer. The thoroughly decomposed oil cake is a thoroughly decomposed sesame cake. The nitrogenous fertilizer can improve the soil environment of the tobacco plant root zone, is beneficial to increasing the content of acid phosphatase in the soil, promotes the root development of the tobacco plant, increases the number of effective leaves, and can balance chemical components in cigar leaves.

The invention discloses a photocatalytic nitrogen fertilizer preparation and application integrated device in the technical field, the photocatalytic nitrogen fertilizer preparation and application integrated device comprises a floating support, the floating support is arranged in a paddy field, the upper part of the floating support is fixedly provided with a nitrogen fertilizer preparation mechanism, and the nitrogen fertilizer preparation mechanism comprises a reaction tank; the device uses solar energy as the only energy to drive the air pump, and does not depend on fossil energy; in combination with reaction period control, the concentration of ammonium nitrogen in the field water can be stably maintained at a proper concentration; ammonium nitrogen is dissolved in water and directly enters crop rhizosphere to be absorbed; the lifting ring is pushed and extruded through the reset spring, the aeration nozzle is used for aeration, the gradient photocatalytic material can dissolve ammonium nitrogen generated by nitrogen in air in water under photoreaction, under the action of the reset spring, the lifting ring can achieve lifting adjustment, the position can be conveniently adjusted through air pressure, and the gradient photocatalytic material can be recycled. And the turbine blades can rotate by virtue of the aerated air flow, so that a solution in the reaction tank is stirred, and the sufficiency of ammonium nitrogen dissolved in water is conveniently improved.

The invention provides a nitrogen fertilizer application method for reducing nitrogen deficiency of double cropping rice under full straw returning, and belongs to the technical field of biological agriculture. According to the method, the application proportion of the tillering fertilizer is increased under the straw returning condition, the optimal application scheme is obtained, the content of ammoniacal nitrogen and nitrate nitrogen in soil is remarkably increased, the nitrogen contending benefit of soil microorganisms and crops is effectively relieved, and effective tillering formation is promoted. The technical scheme provided by the invention is beneficial to establishment of a rice root system, remarkably promotes absorption and transfer of nitrogen in plants, and improves the number of effective ears of rice, thereby remarkably improving the rice yield.

The invention relates to the technical field of fertilizers, and discloses a molybdenum-boron synergistic control type macroelement water-soluble fertilizer, which is prepared from the following raw materials in parts by weight: nitrate nitrogen, ammonium nitrogen, ammonium polyphosphate, potassium oxide, chelated magnesium (MgO), trace elements, a stress-resistant enhancer, a synergistic control agent and a stabilizer, the trace elements are composed of ammonium molybdate, a boric acid-glycerol compound, chelated zinc, chelated manganese (Mn-EDTA) and a chelating agent. According to the molybdenum-boron synergistic control type macroelement water-soluble fertilizer and the preparation process thereof, the ammonium molybdate and the boric acid-glycerol compound are added into the fertilizer, so that the nutrient deficiency symptom can be effectively and synergistically prevented, the fungal disease resistance can be effectively improved by adding the salicylic acid and the nano silicon dioxide, and meanwhile, the effect of preventing and treating the macroelement is achieved. By adding the chlamydomonas rubra enzymolysis extract containing natural abscisic acid, potassium silicate and polyaspartic acid, the high temperature resistance, drought resistance and heavy metal pollution resistance of the fertilizer can be effectively improved, so that the effect of the whole water-soluble fertilizer is improved, and the application range of the water-soluble fertilizer can be widened.

Disclosed are an ammonia-containing wastewater treatment method and an apparatus, of which a main structure includes an ammonia wastewater holding tank receiving therein ammonia-containing wastewater, at least one ammonia nitrogen detection element detecting ammonia nitrogen content of the ammonia-containing wastewater, at least one aeration device connected to the ammonia wastewater holding tank, an oxygen transfer coefficient calculation device in information connection with the aeration device. The aeration device includes an aeration time controller and a gas flowrate controller. As such, a total mass of oxygen entering the ammonia wastewater treatment tank can be precisely controlled by adjusting output time and output amount per unit time of the aeration device and calculating an oxygen transfer coefficient-aeration flowrate relationship of the aeration device, so that a ratio between the ammonia nitrogen mass and the oxygen mass can be controlled to have ammonium nitrogen first oxidized into nitrite before being oxidized into nitrate.

The invention discloses a method for measuring the utilization efficiency and utilization share of inorganic nitrogen of coix lacryma-jobi seedlings. The method comprises the following steps: planting the coix lacryma-jobi seedlings in a mixed nitrogen source consisting of high-abundance 15N marked ammonium nitrogen and natural-abundance nitrate nitrogen; calculating the ammonium nitrogen utilization share of the overground part and the underground part of the coix lacryma-jobi seedling, and calculating the ammonium nitrogen accumulation amount of the overground part and the underground part of the coix lacryma-jobi seedling; calculating the nitrate nitrogen accumulation amount of the coix lacryma-jobi seedlings in the whole experimental treatment; the molar weight of nitrate nitrogen and the molar weight of ammonium nitrogen supplied in the whole culture period are calculated, and the nitrate nitrogen utilization efficiency and the ammonium nitrogen utilization efficiency of the coix lacryma-jobi seedlings are calculated. Besides, on the basis of the ammonium nitrogen accumulation amount and the nitrate nitrogen accumulation amount of the coix lacryma-jobi seedlings in the whole culture period, the nitrate nitrogen utilization share and the ammonium nitrogen utilization share of the coix lacryma-jobi seedlings can be quantified, and the utilization difference of the nitrate nitrogen and the ammonium nitrogen of the coix lacryma-jobi seedlings under different inorganic nitrogen supply conditions is revealed; and a scientific basis is provided for deeply knowing an inorganic nitrogen utilization strategy of the coix lacryma-jobi seedlings.

The invention relates to a method for determining 15N isotope abundance of ammonium salt by using a high-resolution liquid chromatograph-mass spectrometer, which comprises the following steps: converting 15N-labeled ammonium nitrogen in a 15N-labeled ammonium salt sample into a 15N-labeled organic matter by using a derivatization reagent, and detecting the 15N in-situ abundance by using the high-resolution liquid chromatograph-mass spectrometer. Compared with the prior art, the method can be used for in-situ abundance detection of the 15N labeled ammonium salt inorganic sample, and has the advantages of simplicity, convenience, high applicability, accuracy and the like.

This invention discloses a slow-release fertilizer suitable for lateritic soils in Hainan, comprising a fertilizer core and a coating layer; the fertilizer core comprises the following raw materials in parts by weight: 10-20 parts isobutylene diurea, 1-3 parts 3,4-dimethyl-1H-pyrazole dihydrogen phosphate, 1-3 parts dicyandiamide DCD, 20-30 parts humic acid, and 30-50 parts organic fertilizer; the coating layer comprises the following raw materials in parts by weight: 5-10 parts natural nanotube halloysite, 3-5 parts bentonite, 5-10 parts cyclodextrin, 1-3 parts polyglutamic acid, 1-3 parts wood vinegar, and 5-10 parts polyacrylamide. The isobutylene diurea, humic acid, and organic fertilizer of this invention can effectively replenish organic matter and nitrogen in iron-aluminate soil, maintain soil nitrogen levels, and effectively control the conversion of ammonium nitrogen to nitrate nitrogen in lateritic soil, thereby reducing nitrogen loss and achieving a stable supply of nitrogen. In addition, polyglutamic acid and polyacrylamide have strong water retention capacity, and the fertilizer core is coated with a coating layer to achieve slow release and water retention.