518 results about "Nitrogen fertilizer" patented technology

The invention discloses a crop nitrogen fertilizer management system and method based on multi-agent reinforcement learning, and belongs to the technical field of intelligent agriculture. Comprising the following steps: collecting and preprocessing multi-source data of a target area, calibrating a crop growth-nitrogen cycle model based on the multi-source data, and constructing a dynamic simulation environment; constructing a nitrogen fertilizer application strategy model and a multi-target award function, and performing agent reinforcement learning training by adopting a centralized training-decentralized execution architecture; introducing a large language model, and updating a strategy network and / or a value network of each agent in a training process according to a reward adjustment signal and a decision constraint; when the index fluctuation ratio in the continuous evaluation period is smaller than a preset threshold value, it is judged that the nitrogen fertilizer application strategy model is converged, and an optimal nitrogen fertilizer application strategy model is obtained; and generating a nitrogen fertilizer application scheme based on the optimal nitrogen fertilizer application strategy model in combination with the real-time state data, and generating a natural language interpretation and risk assessment report based on a large language model.

The invention relates to the field of agricultural fertilizer and soil improvement, in particular to a biochar-based slow release fertilizer for improving acidified soil and a preparation method thereof.The biochar-based slow release fertilizer is prepared from, by mass, 60 parts of a biochar system, 5-12 parts of nitrogen fertilizer, 10-18 parts of phosphate fertilizer, 5-12 parts of potash fertilizer, 5-10 parts of an acid soil modifier and 2-5 parts of a slow release film; graded release of nutrients is achieved through a multi-aperture biochar system, the release rhythm is dynamically adjusted according to soil acidity in combination with a three-layer pH response type slow-release film, the problems that existing fertilizer nutrient release is not matched with crop requirements, and the persistence of acidified soil improvement is poor are solved, the pH and buffer capacity of acidified soil can be improved, the nutrient utilization rate is increased, and the soil quality is improved. And most of the raw materials are agricultural and forestry wastes and industrial byproducts, so that the soil conditioner meets agricultural requirements, is suitable for acidified soil, and has a wide application prospect.

The invention relates to the technical field of precision agriculture and grape cultivation, and discloses a vineyard fertilization method based on unmanned aerial vehicle multi-source remote sensing data, and the method comprises the steps: obtaining a canopy multi-spectral image and three-dimensional structure data through an unmanned aerial vehicle; carrying out image preprocessing and finely extracting a grape canopy region; fusing the extracted spectral vegetation index, texture features and three-dimensional structure features, and constructing a multi-source feature vector; constructing and optimizing a nitrogen nutrition inversion model through a machine learning algorithm by utilizing actually measured nitrogen nutrition parameters; generating a nitrogen content distribution diagram based on a model inversion result, calculating the nitrogen deficiency amount and the recommended dressing pure nitrogen amount of each space unit in combination with critical nitrogen concentration diagnosis and target yield, and converting the nitrogen deficiency amount and the recommended dressing pure nitrogen amount into the use amount of a foliage spraying working solution; and generating a variable fertilization prescription map, and converting the variable fertilization prescription map into a nozzle flow control instruction executable by the unmanned aerial vehicle to realize on-demand accurate variable fertilization. According to the invention, closed-loop management from nitrogen nutrition monitoring to variable rate fertilization is realized, and the nitrogen fertilizer utilization efficiency and the fertilization accuracy are improved.

The invention provides a rice variable rate fertilization method and device, electronic equipment and a storage medium, and relates to the technical field of agricultural intelligent information process.The method comprises the steps that non-rice plant interferents in a multispectral remote sensing image are removed, and a rice plant canopy mask is generated; based on the rice plant canopy mask, multi-dimensional features of the rice plant canopy are extracted and fused, and a fused growth feature vector is obtained; grading the rice growth vigor according to the fused growth vigor feature vector through a growth vigor grade prediction model to obtain a predicted growth vigor grade; performing standardization processing on the predicted growth vigor level to obtain a standardized growth vigor level; determining a nitrogen fertilizer adjustment factor based on the standardized growth vigor grade; and according to the nitrogen fertilizer adjustment factor, adjusting a standard nitrogen application amount to obtain a recommended nitrogen application amount. According to the invention, accurate recommendation of the nitrogen application amount in the rice planting process can be realized, so that accurate fertilization is realized.

The invention relates to the technical field of agricultural fertilizers, and particularly discloses a polypeptide fish protein flushing water-soluble fertilizer and a preparation method thereof, the water-soluble fertilizer is prepared from the following raw materials: unrotten small fish or fish sewer, edible cane sugar or brown granulated sugar, a self-prepared fish protein enzymolysis agent, a self-prepared fish protein anaerobic fermentation inoculant and water; the preparation method comprises an enzymolysis stage and a fermentation stage. The compound fertilizer can be used as a nitrogen fertilizer to replace a traditional chemical nitrogen fertilizer, or is matched with a trace element fertilizer in a compound fertilizer to be used in crop planting; the water-soluble fertilizer has the beneficial effects that the water-soluble fertilizer can supplement soil protein amino acid fertilizer nutrition and increase the content of nutritional ingredients in crops, fermented polypeptide micromolecule sugar can be directly absorbed by the crops to improve the taste, ecological organic planting is realized, meanwhile, the planting cost is reduced, and the water-soluble fertilizer is suitable for fruit and vegetable planting families, farms, picking gardens, greenhouse farmers and the like, is simple and easy to operate, and is suitable for popularization and application. Raw materials are easy to collect, low in cost and obvious in effect.

The invention discloses a key gene identification method related to tobacco nitrogen response, which comprises the following steps: S1, setting four nitrogen fertilizer gradient treatments on the basis of same phosphorus and potassium fertilization by adopting a field experiment of a completely random block; s2, randomly taking the 6th to 8th leaves of the five plants in each area, and dividing a sample into two parts: quickly freezing one part with liquid nitrogen, and storing at-80 DEG C for RNA (Ribonucleic Acid) extraction and transcriptome sequencing; one part is used for measuring the nitrogen content, and after baking and drying treatment, a KjeltecTM8100 automatic nitrogen analyzer is used for measuring; s3, nitrogen content determination: determining the nitrogen content in the treated sample by using an automatic nitrogen analyzer KjeltecTM8100; according to the method, high-throughput transcriptome sequencing and weighted gene co-expression network analysis (WGCNA) are combined, so that not only can gene expression maps of flue-cured tobacco leaves treated by different nitrogen fertilizers be comprehensively captured, but also gene modules with similar expression modes can be mined from a global perspective.

The invention relates to the technical field of soil fertilization, in particular to a plain area dry farmland thick and fertile plough layer construction and productivity improvement method which comprises the following steps: in the first year, after corn is harvested, smashing straws, turning and burying the straws and returning the straws to the field, and in the next year, performing soil preparation and sowing by adopting flat-planting wide-narrow-row planting or ridge-planting uniform-row planting; in the second year, after the corn is harvested, the whole straw or smashed straw covers and returns to the field, straw row-collecting no-tillage sowing is carried out in the next year, and flat-cropping wide-narrow row planting is adopted for sowing; in the third year, after the corn is harvested, the whole straw or smashed straw covers and returns to the field, straw row-collecting no-tillage sowing is carried out in the next year, and flat-cropping wide-narrow row planting is adopted for sowing. Through the implementation of the technical method, the thickness of a plough layer of the dry farmland in the plain area is increased by 13-15 cm, the nitrogen fertilizer utilization rate is increased by 10%-15%, and the soil fertility level is increased by 0.5-1 grade.

The invention discloses a method for detecting the nitrogen content of organ tissues of different varieties of oilseed rapes based on visible near-infrared spectroscopy, which comprises the following steps: firstly, collecting oilseed rape leaf, shell, stalk and root system samples under the conditions of multiple varieties and multiple nitrogen fertilizer levels, and acquiring spectral data within the range of 430-2500nm by using a visible near-infrared spectroscopy; and a Kjeldahl method is synchronously adopted to measure the real nitrogen content as a reference value. Preprocessing the spectral data, including de-noising, standard normal variable transformation, multivariate scatter correction and derivative processing, so as to weaken the influence of scattering and baseline drift; characteristic wavelengths related to the nitrogen content are screened through stepwise regression, variable projection importance, competitive self-adaptive reweighted sampling, a continuous projection algorithm and other methods, and a random forest model, a support vector machine model, a partial least squares discriminant analysis model, a partial least squares regression model, a support vector regression model, an XGBoost model and other models are combined. And respectively constructing a classification identification model and a regression prediction model.

The invention discloses a preparation method of an ethyl cellulose and isocyanate cross-linked coated urea slow-release fertilizer, and relates to a preparation method of a urea slow-release fertilizer. The invention aims to solve the problems that the existing nitrogen fertilizer is low in utilization rate and easy to absorb moisture and cake, a polyurethane coating material is non-degradable, and pure ethyl cellulose is insufficient in mechanical strength and limited in water resistance and is not beneficial to being used as a coating matrix of the fertilizer. The method comprises the following steps: 1, preparing an ethyl cellulose cross-linked isocyanate enveloping solution; and 2, preparing the ethyl cellulose and isocyanate cross-linked coated urea slow-release fertilizer. According to the preparation method, etherified derivative ethyl cellulose of cellulose is taken as a raw material, and the defects that a pure ethyl cellulose membrane is insufficient in mechanical strength, limited in water resistance and low in nutrient separation control precision are overcome by utilizing isocyanate crosslinking modification. The prepared slow-release fertilizer has the advantages of being simple in process, low in cost, environmentally friendly, degradable in matrix, capable of effectively preventing urea from absorbing moisture and caking and the like, and is suitable for large-scale preparation and used in agricultural production.

The invention discloses a lolium perenne seedling returning nitrogen reduction amount regulation and control method based on soil multifunctional evaluation, and relates to the technical field of agricultural planting.According to the method, a closed-loop dynamic regulation and control system is constructed, aiming at the soil characteristic difference after lolium perenne seedlings are returned to the field, precise and personalized management of the application amount of nitrogen fertilizer is achieved, and the application amount of nitrogen fertilizer is improved. According to the method, the nitrogen fertilizer compensation amount is dynamically adjusted according to the soil multifunctionality real-time evaluation result of the key growth stage of crops, and the yield fluctuation caused by blind reduction of application is effectively avoided, so that the stability and improvement of the crop yield are ensured while the chemical nitrogen fertilizer input is remarkably reduced, and the economic benefit is increased. The technical scheme that physical, chemical and biological indexes of soil are comprehensively evaluated in the key growth stage of crops, and the nitrogen fertilizer correction amount is dynamically calculated based on the deviation between the evaluation result and the target function range is adopted, so that the accurate regulation and control of the nitrogen fertilizer application amount can be realized; therefore, the stable yield of crops is guaranteed and the soil health level is continuously improved while the application of chemical nitrogen fertilizer is reduced.

The present disclosure provides non-intergeneric remodeled microbes that are able to fix atmospheric nitrogen and deliver such to plants in a targeted, efficient, and environmentally sustainable manner. The utilization of the taught microbial products will enable farmers to realize more productive and predictable crop yields without the nutrient degradation, leaching, or toxic runoff associated with traditional synthetically derived nitrogen fertilizer. The remodeled microbes taught herein are able to be combined with leading agricultural chemistry and elite germplasm. Furthermore, the disclosure provides seed treatments comprising remodeled microbes.

The present disclosure provides non-intergeneric remodeled microbes that are able to fix atmostpheric nitrogen and deliver such to plants in a targeted, efficient, and environmentally sustainable manner. The utilization of the taught microbial products will enable farmers to realize more productive and predictable crop yields without the nutrient degradation, leaching, or toxic runoff associated with traditional synthetically derived nitrogen fertilizer. The remodeled microbes taught herein are able to be combined with leading agricultural chemistry and elite germplasm. Furthermore, the disclosure provides seed treatments comprising remodeled microbes.

The invention belongs to the technical field of fertilizers, and particularly relates to magnesium-containing controlled-release urea and a preparation method thereof, and the magnesium-containing controlled-release urea is characterized in that magnesium or magnesium-boron, magnesium-zinc and magnesium-boron-zinc medium trace element combinations are added into large-particle urea, and then coating is carried out. According to the controlled-release urea, elements such as magnesium are added into molten urine, then roller granulation and cooling are carried out, and finally coating is carried out. According to the prepared product, urea, magnesium and other elements can be synchronously and slowly released for a long time, nitrogen, magnesium and other nutrients have synergistic benefits, the utilization rate of nitrogen fertilizer, magnesium and other elements can be further increased, robust growth of crops is promoted, the yield is increased, the quality is improved, the stress resistance is enhanced, and labor is saved; and the method is especially suitable for regions with relatively common lack of medium trace elements and high-added-value commercial crops, and has a wide practical application value.

The invention discloses a straw returning water-nitrogen synergistic method based on a biochemical inhibitor, and belongs to the technical field of agricultural resources and environments. The straw returning water-nitrogen synergistic method based on the biochemical inhibitor comprises the following steps that in an annona squamosa-soybean interplanting system, a water-nitrogen synergistic agent is added into an annona squamosa-soybean interplanting system; the nitrogen release and straw decomposition process is regulated and controlled through the synergistic effect of the biochemical inhibitor and water management, short-term crop requirements and long-term soil fertilization are both considered, and the water and nitrogen utilization efficiency is improved. According to the invention, a comprehensive strategy of'regulation and control of nitrogen release by a biochemical inhibitor and collaborative management of water and nitrogen 'is adopted. Release of nitrogen fertilizer is delayed through the urease inhibitor, straw decomposition and crop requirements are matched, and short-term nitrogen starvation of soybeans is avoided; generation of nitrate nitrogen is reduced through the nitrification inhibitor, nitrogen leaching and denitrification loss are reduced, and the nitrogen fertilizer utilization rate is increased; the irrigation amount is adjusted according to the straw decomposition stage and the crop growth stage, microbial decomposition is driven, and meanwhile the carbon conversion efficiency is improved.

The present disclosure provides non-intergeneric remodeled microbes that are able to fix atmospheric nitrogen and deliver such to plants in a targeted, efficient, and environmentally sustainable manner. The utilization of the taught microbial products will enable farmers to realize more productive and predictable crop yields without the nutrient degradation, leaching, or toxic runoff associated with traditional synthetically derived nitrogen fertilizer, by mitigating or eliminating the need for exogenous nitrogen-containing fertilizers. The remodeled microbes have unique colonization and nitrogen fixation abilities, which enable the microbes to deliver nitrogen to a cereal plant in a spatially targeted (e.g. rhizospheric) and temporally targeted (e.g. during advantageous stages of plant's life cycle) manner. The microbes are able to replace the standard agricultural practice of sidedressing and enable a more environmentally sustainable form of farming. The present disclosure also provides methods of using non-intergeneric remodeled microbes, for example, to fix atmospheric nitrogen by reducing or eliminating the need for exogenous nitrogen-containing fertilizers, to increase yield, and to reduce infield variability in the yield.

The invention relates to the technical field of chemical fertilizer preparation, and discloses a special synergistic pesticide fertilizer for a ratoon cane seedling stage, a preparation method and application thereof, the pesticide fertilizer adopts a core-shell layered structure, and comprises a core fertilizer layer, a pesticide layer and a resin coating layer from inside to outside in sequence; the medical fertilizer comprises the following components: 20-40% of an organic fertilizer; 20%-40% of inorganic nitrogen fertilizer; 5%-20% of a medium element fertilizer; 0.1%-2.5% of an insecticide; 0.1%-2.5% of a bactericide; 0.5%-5% of a composite slow release agent; 0.4%-2% of a resin coating material; and the balance of filler. By optimizing a formula and a preparation process, synergistic release of fertilizer nutrients and pesticide active ingredients is realized, nutrient requirements and disease and pest control requirements of ratoon sugarcanes in the seedling stage are met, the budding rate is remarkably increased, the withered seedling rate is reduced, and yield and income are finally increased; the stability and effectiveness of each component in the pesticide fertilizer can be effectively ensured; through precise application, multiple effects of the pesticide fertilizer are exerted to the maximum extent, and a standardized technical scheme is provided for seedling management of ratoon sugarcanes.

The invention discloses a high-calcium suspension fertilizer as well as a preparation method and application thereof, and relates to the technical field of chemical fertilizer production, the high-calcium suspension fertilizer comprises the following components in parts by weight: 20-30 parts of a macroelement fertilizer, 10-15 parts of a medium element fertilizer, 3-5 parts of a microelement fertilizer, 0.5-3 parts of an auxiliary agent and 30-50 parts of deionized water; the macroelement fertilizer is prepared from 30-50 parts of nitrogen fertilizer, 20-30 parts of phosphate fertilizer and 15-20 parts of potash fertilizer; the medium element fertilizer is modified nano calcium carbonate and magnesium carbonate; the trace element fertilizer is prepared from zinc amino acid, sodium tetraborate, ferric sodium ethylenediaminetetraacetate, molybdenum sodium ethylenediaminetetraacetate, manganese sulfate monohydrate and copper sulfate pentahydrate. Therefore, the nano calcium carbonate can be quickly absorbed by the plants, so that calcium ions can be supplemented in time in the growth process of the plants, and the growth of the plants is accelerated.

The invention relates to the technical field of soil improvement, in particular to a preparation method of a fertilizer for navel orange orchard soil, and the method comprises the following steps: mixing black carbon, a nitrogen fertilizer and a conditioner according to an initial ratio to obtain an initial fertilizer sample; performing soil sampling on the target navel orange orchard, putting an initial soil sample into a sealing bag, marking the sampling position, depth and time, and measuring initial soil parameters of the initial soil sample; applying an initial fertilizer sample to the navel orange tree at the soil sampling point, and earthing and watering after fertilization; soil parameters of the soil sampling points are periodically detected, whether the preparation process of the fertilizer is qualified or not is analyzed based on the soil parameters, reasons for disqualification of the preparation process of the fertilizer are analyzed when it is judged that the preparation process of the fertilizer is unqualified, and irrigation treatment or fertilizer dosage adjustment is conducted based on the determined reasons. The control accuracy of the fertilizer preparation process is improved by continuously monitoring, feeding back and adjusting the fertilizer preparation ratio after the fertilizer is used.

The invention relates to the field of data analysis, in particular to a controlled-release nitrogen fertilizer application decision optimization method in combination with soil water content change characteristics, and the method comprises the following steps: obtaining an effective infiltration potential energy optimization factor through field water capacity threshold truncation of a soil volume water content sequence and effective infiltration potential energy time window accumulation difference evaluation; obtaining a water potential lag direction optimization factor through first-order difference gradient direction consistency and trend amplitude gating coupling evaluation of the soil volume moisture content sequence; the DTW local distance is corrected through the effective infiltration potential energy optimization factor and the water potential lag direction optimization factor; and performing release curve weighted prediction on the optimal matching historical sequence corresponding to the optimized DTW distance to obtain an accurate controlled-release nitrogen fertilizer application decision suggestion so as to solve the problems of historical scene matching distortion and controlled-release nitrogen fertilizer application decision deviation caused by neglecting of an effective cumulative effect and a water potential hysteresis effect in the existing Euclidean distance measurement.

The invention belongs to the field of agricultural computer electronics, and particularly discloses a winter wheat nitrogen nutrition diagnosis and nitrogen demand estimation method based on hyperspectral data, which comprises the following steps: acquiring winter wheat canopy spectral data by adopting an ASD FieldSpec4 hyperspectral spectrometer, and measuring the nitrogen concentration and biomass of winter wheat leaves at the same time; and estimating the nitrogen concentration and biomass in combination with a one-dimensional convolutional neural network model. And based on the estimation result, calculating the nitrogen nutrition index by using a critical nitrogen dilution curve, and establishing a nitrogen demand estimation model comprehensively considering the number of days after sowing, the nitrogen fertilizer recovery efficiency and the nitrogen nutrition index. The method provides powerful support for accurate management of the winter wheat nitrogen fertilizer.

The invention discloses a rapid distinguishing method for predicting a nitrogen source produced by flooded soil through combination of in-situ observation and a model, and relates to the technical field of agro-ecology. Field micro-areas are divided in a target area, an intelligent sensing system is deployed, and soil environment parameters are monitored in real time; the method comprises the following steps: sampling soil in a target area, measuring soil bulk density, root layer depth, total nitrogen content and 15N abundance parameters of a soil sample, and obtaining soil basic data; and calculating the optimal 15N fertilizer abundance according to the recommended nitrogen fertilizer dosage recommended by the target area in combination with the soil nitrogen library content, the fertilizer application amount and the soil background 15N abundance. According to the method, dynamic changes of soil environment parameters are captured through combination of in-situ observation and an intelligent sensing system, the generation rate of nitrogen isotopes is monitored synchronously, the limitation that a traditional method depends on a single parameter is avoided, the distinguishing precision of nitrogen loss sources is remarkably improved, and the contribution rate of the in-situ observation and the intelligent sensing system to nitrogen loss can be rapidly calculated by combining model analysis.

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 agriculture, and discloses a rice yield increasing method for no-tillage returning of winter slack weeds and combined application of nitrogenous fertilizer, which comprises the following steps: crushing and tiling the winter slack weeds, and spraying a microbial agent containing signal secretion flora; coating urea with a coating solution containing signal response microorganisms to prepare a slow-release nitrogen fertilizer; slow-release nitrogen fertilizer is applied to a weed layer, and a reaction substrate is formed through shallow layer operation and mixing; matrix moisture is regulated and controlled to conduct signal molecules and activate microorganisms to start release; and transplanting the rice into the substrate, and carrying out whole-growth-period cultivation by utilizing nutrients of the rice. An integrated synergistic reaction matrix is constructed, so that a weed decomposition system and a fertilizer response system are tightly coupled in physical space and mutually promoted in function, a biological signal is provided for fertilizer release in the weed decomposition process, and a decomposition product can be used as a carbon source of microorganisms in a slow-release shell; metabolite of microorganisms can reversely promote decomposition of weeds, and the resource efficiency of weed returning and the overall efficiency of the system are improved.

The present invention relates to urease inhibitor compositions containing tert-butylhydroquinone and optionally an additive component to enhance the inhibitory properties of tert-butylhydroquinone. Further described are uses of these compositions in agriculture to increase nutrient uptake and inhibit urease enzyme activity.

The invention discloses a highland barley rhizosphere microbial community regulation and control method, which comprises the following steps: clustering sequencing sequences of microbial data in rhizosphere soil data of mature highland barley to obtain taxonomic information and an operable classification unit, performing zero-model analysis on the soil data and the operable classification unit according to planting data, and determining whether the soil data and the operable classification unit are in zero-model analysis. The method comprises the following steps: acquiring a ratio of nitrogen fertilizer data to environmental screening contribution and drift contribution of microbial community composition, performing diversity analysis on an operable classification unit according to taxonomy information to obtain dominant species data, extracting a nitrogen fertilizer amount and a fertilization period corresponding to the dominant species data, and performing parameter optimization through a Bayesian optimization algorithm. The rhizosphere soil is fertilized according to the fertilization period and the optimization parameters of the planting area, and the regulation and control result of the microflora is obtained. According to the method, the optimal nitrogen application amount gradient is determined through zero model analysis and Bayesian parameter optimization, so that the rhizosphere microorganism function adapts to the growth requirement of highland barley, and an interpretable basis is provided for optimizing nitrogen fertilizer management.

The invention relates to a system and a process for preparing an efficient carbon-based fertilizer by carbonizing agricultural and forestry biomass, which are applied to the technical field of carbon-based fertilizer preparation, and the system comprises a raw material pretreatment unit, a biomass granulation unit, a biomass carbonization unit, a biomass charcoal activation unit, a finished product post-treatment unit and a volatilization inhibition composite unit, the volatilization-inhibiting composite unit comprises a mixed base preparation module and a wrapping volatilization-inhibiting module; the wrapping volatilization-inhibiting module comprises a rotary drum granulator, a base material feeder, a nitrogen source feeder, a humidity adjusting mechanism and a granulation control module; based on the design of the volatilization-inhibiting composite unit, a graded volatilization-preventing granulation strategy of firstly preparing a nitrogen-free core and then wrapping a nitrogen fertilizer is adopted, so that direct and large-area contact between high-pH-value biochar and volatile nitrogen source components in the granulation process is thoroughly isolated from physical space and time sequence; therefore, generation and dissipation of a large amount of ammonia gas are avoided from the source, and the utilization efficiency of the fertilizer is remarkably improved.

The application discloses an environment-friendly slow-release fertilizer and a preparation method thereof, and belongs to the technical field of fertilizer mixture preparation. The preparation method comprises the following steps: mixing, stirring and heating mussel extract-polysaccharide-nitrogen fertilizer complex, inorganic fertilizer and water according to a weight ratio of 1-2:5-7:15-23 to form a dispersion solution heated to 50-60 DEG C, mixing and stirring the dispersion solution with calcium salt according to a weight ratio of 1:0.005-0.01, and cooling to 20-25 DEG C to react for 20-24 hours to obtain a viscous mixture; and drying and crushing the viscous mixture to obtain the environment-friendly slow-release fertilizer. The mussel extract with good adhesion effect and carboxymethyl cellulose or hyaluronic acid with biocompatibility are used as carriers, the nitrogen fertilizer and the inorganic fertilizer are wrapped through the synergistic cooperation of amide structure, imine structure and metal coordination, and finally the environment-friendly slow-release fertilizer is obtained.

The invention discloses a rice blast prevention and control and fertilizer efficiency improvement dual-objective optimization method, and relates to the technical field of agricultural informatics, and the method comprises the following steps: S1, data collection: obtaining rice field environment parameters, rice plant physiological parameters and pathogenic bacteria infection pressure indexes in real time; s2, constructing a double-objective collaborative optimization model: based on the data in the step S1, establishing a dynamic decision-making model which takes the maximization of the fertilizer efficiency utilization rate and the minimization of the rice blast occurrence risk as a combined objective. According to the method, a dynamic decision-making model taking maximization of the nitrogen fertilizer utilization rate and minimization of the rice blast severity as a combined target is constructed, the nitrogen fertilizer application amount, the bactericide type and the time sequence are subjected to collaborative optimization, a weight coefficient is introduced into the model, the target priority is dynamically adjusted according to the growth period, and the nitrogen fertilizer application amount is restrained in an agronomic safety interval; diseases caused by excessive application of nitrogen are avoided, positive correlation between the nitrogen fertilizer and the diseases is reduced from the source, pesticide dependence is reduced, and double improvement of the control effect and the fertilizer effect is achieved.

The invention discloses a fertilizing method for cold resistance and yield increase of heading lettuce, and belongs to the technical field of functional water-soluble fertilizers. The method comprises the following steps: applying a bio-organic fertilizer and a ternary compound fertilizer as a base fertilizer in a planting period; topdressing a water-soluble fertilizer A composed of a liquid nitrogen fertilizer and a cold-resistant functional peptide bacterial fertilizer through drip irrigation in the early rosette stage; topdressing a water-soluble fertilizer B consisting of a high-potassium drip irrigation water flush fertilizer and a cold-resistant functional peptide bacterial fertilizer in the later stage of the rosette stage; topdressing high-potassium drip irrigation and water flush fertilizer at the initial stage of the heading stage. On the basis of a water and fertilizer integrated system, the cold-resistant functional peptide bacterial fertilizer is precisely applied in stages, the liquid nitrogen fertilizer and the high-potassium water-soluble fertilizer are optimized, the synergistic effect of peptide substances, functional microorganisms and nutrient elements is fully played, the cold resistance of the heading lettuce is remarkably enhanced, nitrogen is reduced by 15%-20%, the yield is increased by 40%-50%, the income is increased by 1200-1300 yuan per mu, and the yield is increased by 100-200 yuan per mu. And the method has important popularization and application values.

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.