36 results about "Nitrogen accumulation" patented technology

The invention discloses candida tropicalis with the effect of reducing nitrite and ammonia nitrogen and application of the candida tropicalis. The saccharomycetes are respectively named as candida tropicalis JM-2, and the preservation number of the candida tropicalis JM-2 is GDMCC No: 64449. The saccharomyces cerevisiae is high in adaptability, grows well in high-concentration ammonia nitrogen and nitrite environments, is relatively high in nitrogen degradation efficiency, can be used as a functional strain for improving water quality, deodorizing farms, deodorizing garbage yards and the like, can be applied to a plurality of places, effectively degrades harmful substances such as nitrite, ammonia nitrogen and the like in water bodies and environments, reduces nitrogen accumulation, protects the environments, and has a wide application prospect. The method has great application potential in livestock and poultry aquaculture and environmental protection.

The present invention relates to the technical field of slow-release fertilizers, and discloses a double-modified all-bio-based polyurethane coated fertilizer and a preparation method thereof, wherein the preparation method comprises: mixing an alkali and a fatty acid for reaction for 1.25 to 2 hours, and obtaining a hydrophobic nanomaterial after drying; mixing a bio-based polyol and an isocyanate, and then adding the obtained hydrophobic nanomaterial and a surfactant to obtain a double-modified all-bio-based coating liquid; mixing fertilizer particles with the obtained double-modified all-bio-based coating liquid, and curing to obtain a double-modified all-bio-based polyurethane coated fertilizer. The double-modified all-bio-based polyurethane coated fertilizer prepared by the present invention has a significantly increased water contact angle, a better hydrophobic effect, and a reduced nitrogen cumulative nutrient release rate, greatly improving the release performance, and extending the controlled release period of the coated fertilizer.

The invention provides a gene for improving nitrogen utilization efficiency of wheat under a nitrogen deficiency condition and application thereof, and belongs to the technical field of biological agriculture. Normal nitrogen and nitrogen deficiency condition stress treatment of natural wheat varieties around the world is combined with whole genome association analysis and verification, and the gene erf related to the nitrogen deficiency tolerance character is obtained. The erf gene not only responds to wheat nitrogen deficiency condition stress and shows up-regulated expression, but also promotes growth and nitrogen accumulation of wheat under the nitrogen deficiency condition in a negative regulation mode, so that the nitrogen utilization efficiency of wheat is improved. The erf gene provided by the invention can effectively regulate and control growth and nitrogen utilization of wheat under nitrogen deficiency conditions, provides a new strategy for construction and breeding of wheat nitrogen deficiency tolerance varieties, and also provides effective sites for nitrogen deficiency wheat environment detection and variety identification.

The invention discloses an automatic crop nitrogen fertilizer accurate management method based on a remote sensing image, and relates to the technical field of accurate fertilization, the method comprises the following steps: obtaining ground measured data containing overground biomass and plant nitrogen concentration in a key growth period, and establishing a nitrogen dilution curve model through nonlinear least square fitting; uAV multispectral images are collected synchronously, a vegetation index matrix is calculated, a machine learning regression model is trained in combination with ground data, and an inversion model of overground biomass and plant nitrogen accumulation is obtained; acquiring a current-season image before topdressing, and performing pixel-by-pixel inversion to generate a biomass and nitrogen accumulation spatial distribution diagram; and calculating a critical nitrogen accumulation amount according to the nitrogen dilution curve so as to obtain a nitrogen nutrition index, calculating a recommended topdressing amount in combination with a preset basic topdressing amount and a nitrogen fertilizer utilization rate, and outputting a prescription map which can be directly imported into a variable fertilization machine. The method belongs to localized modeling and machine prescription map generation, the technical threshold is lowered, the nitrogen fertilizer utilization rate is increased, and environmental pollution is reduced.

The invention belongs to the technical field of fertilizers and relates to a compound fertilizer for black beans as well as a preparation method and application thereof. The compound fertilizer comprises a basic fertilizer, a microbial fertilizer and a trace element fertilizer, and a preparation method of the microbial fertilizer comprises the following steps: treating lignite with sophorolipid and trehalose lipid, treating turf with surfactin, mixing the treated lignite and turf, and then inoculating bacillus subtilis and rhizobium to obtain the microbial fertilizer. Through a unique dual mechanism of carrier synergism and fungicide function complementation, the dry matter cumulant and nitrogen cumulant of the overground part of the black bean are remarkably increased, and finally the yield and quality are remarkably improved.

The application provides a gene for improving nitrogen utilization efficiency of wheat under nitrogen deficiency conditions and application thereof, and belongs to the technical field of biological agriculture. The gene erf related to the nitrogen deficiency tolerance trait is obtained through normal nitrogen and nitrogen deficiency stress treatment of natural wheat varieties in the world and whole genome association analysis and verification. The erf gene not only responds to the up-regulated expression under the nitrogen deficiency stress of wheat, but also promotes the growth and nitrogen accumulation of wheat under the nitrogen deficiency conditions through a negative adjustment mode, so as to improve the nitrogen utilization efficiency of wheat. The erf gene provided by the application can effectively regulate the growth and nitrogen utilization of wheat under the nitrogen deficiency conditions, provides a new strategy for the construction and breeding of wheat varieties with nitrogen deficiency tolerance, and provides an effective site for the detection and variety identification of the wheat environment under the nitrogen deficiency.

The application belongs to the technical field of soybean breeding, and particularly relates to a molecular marker related to nitrogen accumulation and biomass accumulation traits of soybean and application thereof. The nucleotide sequence of the molecular marker is shown as SEQ ID NO. 3. The molecular marker contains a SNP site. The SNP site is located at the 101st bp from the 5' end of the sequence shown as SEQ ID NO. 3, has C / A polymorphism, and is significantly related to nitrogen accumulation and biomass accumulation traits of soybean. The molecular marker is applied to the selection process of a breeding population, and individuals with excellent CC genotypes of nitrogen accumulation and aboveground dry weight can be screened. Compared with AA genotypes, the nitrogen accumulation of the CC genotypes is increased by 33.45%, and the aboveground dry weight is increased by 29.89%. The molecular marker can be used for identification of nitrogen absorption and utilization capacity of soybean seedlings, aboveground dry weight and nitrogen accumulation related traits and molecular marker assisted breeding.

The invention belongs to the technical field of rice cultivation, and particularly relates to application of catechin in promoting rice growth and development and / or increasing rice yield. The invention finds that catechin has the function of a biostimulant, and can effectively promote the growth and development of rice and increase the yield of rice. Planting tests show that by applying a proper amount of catechin to rice through root irrigation, direct field application along with base fertilizer or foliage spraying, growth of the overground part of the rice can be remarkably promoted, growth of the underground part of the rice can be promoted, the nitrogen accumulation amount of the rice is increased, the tiller number of the rice is increased, the yield of the rice is increased, and the effect is excellent.

This invention discloses a salt-tolerant Cladosporium 550W1 strain and its application in promoting nodulation and nitrogen fixation in leguminous plants, belonging to the field of microbial technology. The salt-tolerant Cladosporium (… Cladosporium halotolerans Cladosporium 550W1, deposited at the China General Microbiological Culture Collection Center (CGMCC) with accession number CGMCC No. 41943, provides a salt-tolerant Cladosporium 550W1 that can significantly promote nodulation and nitrogen fixation in legumes, increase plant biomass and nitrogen accumulation, and reduce dependence on chemical nitrogen fertilizers. It has broad application prospects and environmental and ecological benefits.

This invention provides a wheat Fd gene and its application in regulating nitrogen use efficiency in wheat under nitrogen deficiency conditions, belonging to the field of bio-agricultural technology. This invention screened 284 wheat varieties for nitrogen deficiency stress treatment to obtain the Fd gene associated with nitrogen deficiency tolerance. The Fd gene not only exhibits downregulated expression in response to nitrogen deficiency stress in wheat, but also promotes wheat growth and nitrogen accumulation under nitrogen deficiency conditions through negative adjustment, thereby improving wheat nitrogen use efficiency. The Fd gene provided by this invention can effectively regulate wheat growth and nitrogen use under nitrogen deficiency conditions, providing a new strategy for the construction and breeding of nitrogen-tolerant wheat varieties, and also providing an effective site for the detection and variety identification of nitrogen-deficient wheat environments.

The invention discloses application of a ZmAAAP64 gene in regulation and control of protein accumulation and nitrogen utilization of a whole corn plant, and belongs to the technical field of biology. The nucleotide sequence of the ZmAAAP64 gene is as shown in SEQ ID NO. 11. A BC2S3 population is constructed based on wild corn Ames21814 and a common corn inbred line B73 for QTL positioning, a key gene ZmAAAP64 for regulating and controlling the protein content and nitrogen utilization efficiency of the whole corn plant is excavated, structural variation analysis finds that in different corn population materials, insertion and deletion variations exist in a plurality of conservative intervals of a ZmAAAP64 gene promoter region, and the ZmAAAP64 gene promoter region has a high expression in the whole corn plant protein content and the nitrogen utilization efficiency of the whole corn plant protein content and the nitrogen utilization efficiency of the whole corn plant protein content and the nitrogen utilization efficiency of the whole corn plant protein content. The accumulation amount of Gln and Asn in the stem of the ZmAAAP64 gene overexpression material is increased by about 30-60%, and the protein content of the stem, the protein content of the leaf and the nitrogen accumulation amount of the whole plant are remarkably increased. And a technical means is provided for cultivating corn with high protein and high nitrogen utilization efficiency.

This invention discloses a desulfurization control system and method based on intelligent feedback and argon gas sealing protection. The desulfurization control system and method based on intelligent feedback and argon gas sealing protection belong to the field of metal melt refining technology. The system includes a ladle, a sealing cap with inert gas protection, a spray tank with a zoned fluidization structure, a composite long-life spray gun, and an intelligent control unit. The method performs desulfurization by establishing an inert atmosphere, sequentially fluidizing the powder in zones, inserting the spray gun, and adjusting the carrier gas flow rate in real time based on visual feedback. This invention achieves deep and efficient desulfurization, with a desulfurization rate of over 85%, while effectively preventing nitrogen accumulation, significantly extending the spray gun life, and improving the automation and safety of the entire process.

The application belongs to the technical field of plant molecular breeding, and provides a corn ZmAAP37 Gene in regulating corn agronomic traits and grain nitrogen accumulation, the application includes at least one of the following: (1) increase the nitrogen content of corn kernel; (2) increase the free amino acid content of corn kernel; (3) improve the aboveground biomass of corn plant; (4) increase the plant height of corn plant; (5) delay the leaf senescence of corn plant; (6) improve the nitrogen utilization rate of corn. The application shows that, ZmAAP37 By increasing the transport of amino acids in leaves to phloem, the nitrogen remobilization is promoted, and finally the grain nitrogen concentration is significantly increased without affecting the grain yield. The application provides ZmAAP37 The gene can provide new gene resources for nitrogen utilization of crops, especially corn, and has great application value in regulating nitrogen utilization of crops.

The invention discloses saccharomycetes with the effect of reducing nitrite and ammonia nitrogen and application of the saccharomycetes. The saccharomycetes are respectively named as Cyberlindnera jadinii A-1, and the preservation number of the saccharomycetes is GDMCC No: 64447. The invention further discloses a preparation method of the saccharomycetes. The saccharomycetes are high in adaptability, can effectively inhibit vibrio, grow well in high-ammonia-nitrogen and high-nitrite environments, are relatively high in nitrogen degradation efficiency, can be used as functional strains for improving water quality, deodorizing farms, deodorizing garbage yards and the like, can be applied to a plurality of places, effectively degrade harmful substances such as nitrite, ammonia nitrogen and the like in water bodies and environments, reduce nitrogen accumulation, protect the environment, and have a good application prospect. The method has great application potential in livestock and poultry aquaculture.

The invention provides a vegetable ground surface source pollution emission reduction method based on a confinement space and application, and belongs to the technical field of agricultural environment. The confinement space comprises an interlayer and a plough layer; the interlayer is located below the plough layer; the interlayer comprises a high-carbon organic layer and a mineral material layer; the high-carbon organic layer is located below the mineral material layer; the high-carbon organic layer comprises a high-carbon organic material; the plough layer comprises plough layer soil and an organic carbon source material. An organic carbon source material and plough layer soil are mixed to serve as a plough layer, the assimilation capacity of the soil nitrate nitrogen can be improved, the soil nitrate nitrogen is assimilated and then stored, then the soil nitrate nitrogen is mineralized into crops to improve nutrients, the nutrients are intercepted in a confinement space through adsorption and interception of the mineral material layer and the high-carbon organic layer of the interlayer, the utilization of the nutrients of the root system is improved, and the yield is increased. The pollution risk of soil nitrogen and phosphorus leaching to surrounding water bodies is reduced in a layered and multi-way mode, and agricultural non-point source pollution caused by soil nitrate nitrogen accumulation and underground water fluctuation is reduced.

The invention provides a method for improving the monitoring precision of plant nitrogen accumulation, and belongs to the technical field of agricultural remote sensing information detection and metrology, and the method comprises the following steps: firstly, carrying out data conversion, smooth noise reduction and other preprocessing on obtained near-surface hyperspectral data, and obtaining the near-surface hyperspectral reflectivity of a research area; then, on the basis of the near-surface hyperspectral reflectivity, continuous wavelet transform is carried out, and a wavelet feature database is constructed; applying difference operation on the basis of the wavelet feature database to construct a difference wavelet feature index; and finally, constructing a plant nitrogen accumulation amount estimation model by applying the difference wavelet characteristic index, thereby achieving the effects of eliminating the planting condition difference and improving the nitrogen monitoring precision. The method for eliminating the planting conditions and improving the inversion precision of the nitrogen accumulation amount is simple and efficient in operation step, can be used for eliminating the influence of different planting conditions, and is widely applied to inversion of the nitrogen accumulation amount of near-ground or satellite images and related agronomic parameters and the like.

The application discloses a monitoring point layout optimization method and system based on regional scale nitrogen leaching, and relates to the field of agricultural environmental protection.The method comprises the following steps: acquiring a regional area and regional data; based on the regional data, drawing a slope grade map, a groundwater level grade map and a nitrogen accumulation map of the region respectively; performing pixel-to-pixel alignment, superposition and combination calculation on the slope grade map, the groundwater level grade map and the nitrogen accumulation map of the region to generate a plurality of basic units; under a constraint condition, performing initial layout of monitoring points in each basic unit according to the regional area, an obstacle layer and a preset monitoring point spacing; based on an average distance minimization criterion, constructing a target function of the monitoring points; and based on the target function, optimizing the monitoring points in the initial layout by using a space simulated annealing algorithm to obtain an optimized layout of the monitoring points.The application can improve the monitoring accuracy of regional scale nitrogen leaching and the layout efficiency of monitoring well points.

The invention discloses a modified compound fertilizer and a preparation method thereof, and relates to the field of compound fertilizers. Comprising the following components: a nitrogen-phosphorus-potassium basic fertilizer, a humic acid-sodium modified bentonite composite carrier, polyaspartic acid chelated trace elements, a biostimulant and a degradable hydrophobic membrane. The preparation method comprises the following steps: S100, spraying and granulating the nitrogen-phosphorus-potassium base fertilizer in a molten state; s200, sequentially spraying a humic acid-bentonite composite carrier, polyaspartic acid chelated trace elements and a biostimulant, and drying by a fluidized bed; and S300, mixing molten palm wax with sodium lignin sulfonate, coating the surface of a product obtained in the step S200 with the mixture through high-pressure spraying, and performing low-temperature curing to obtain the modified compound fertilizer. According to the invention, a dual slow-release mechanism is realized by utilizing ion exchange control between carrier layers and microcracks of the degradable hydrophobic membrane, and the nitrogen accumulation release rate within 60 days is less than 80%, so that a nutrient release curve is matched with crop requirements; meanwhile, the compression resistance of the particles is improved to 16.2 N, and the soil hardening condition is remarkably improved.

The invention belongs to the technical field of gene engineering, and particularly relates to a corn transcription factor ZmbHLH99 gene and application thereof. The nucleotide sequence of the corn transcription factor ZmbHLH99 gene provided by the invention is as shown in SEQ ID NO (Sequence Identity Number 1). Research results show that compared with ND101, after the corn transcription factor ZmbHLH99 gene is knocked out, the corn plant height and biomass can be remarkably increased, absorption of a corn root system to nitrogen is enhanced, the nitrogen accumulation amount in a corn body is increased, the nitrogen utilization efficiency is improved, corn ears are lengthened and thickened, and then the corn ear yield is increased.

The invention relates to a sorghum variety screening method, device and equipment and a storage medium. According to the main technical scheme, the method comprises the steps that multispectral images, actually-measured sorghum total nitrogen content and actually-measured sorghum biomass of multiple wave bands in the whole growth period of each sorghum field are obtained, the actually-measured sorghum total nitrogen content comprises the actually-measured spike total nitrogen content and the actually-measured leaf total nitrogen content, and the actually-measured sorghum biomass comprises the actually-measured spike biomass and the actually-measured leaf biomass; according to the actually measured spike total nitrogen content, the actually measured leaf total nitrogen content, the actually measured spike biomass and the actually measured leaf biomass, the ratio of the spike nitrogen accumulation amount to the maximum value of the leaf nitrogen accumulation amount is determined, and according to the ratio of the spike nitrogen accumulation amount to the maximum value of the leaf nitrogen accumulation amount and the multispectral images of the multiple wave bands, a nitrogen utilization efficiency evaluation model is constructed, and according to the multispectral image of each sorghum field parcel, based on a nitrogen utilization efficiency evaluation model, screening sorghum varieties of which the nitrogen utilization efficiency meets a preset condition, and realizing large-scale and multi-variety field sorghum rapid screening of varieties with efficient nitrogen utilization.

This invention discloses a device for preventing nitrogen accumulation in molten steel during the refining process of an LF furnace. The device includes an LF furnace body, a furnace cover, an argon gas filling pipe, and an argon gas distribution mechanism for injecting argon gas from the filling pipe into multiple locations within the LF furnace body. A baffle is installed inside the furnace cover, and the argon gas distribution mechanism is located below the baffle. The argon gas filling pipe passes through the furnace cover and the baffle. This device prevents nitrogen accumulation in molten steel during the LF furnace refining process by installing the furnace cover at the upper end of the LF furnace body. During steel refining, argon gas is introduced into the filling pipe by connecting it to an argon gas pipeline. The argon gas is then transported from the filling pipe to a circular pipe via a connecting pipe. Finally, the argon gas is evenly injected into the LF furnace body through jet nozzles, forming an argon gas protective layer on the uppermost surface of the molten steel. This effectively isolates the molten steel from contact with nitrogen in the air, thus preventing nitrogen accumulation. This invention also discloses a method for preventing nitrogen accumulation in molten steel during the LF furnace refining process.

The invention relates to the technical field of agricultural information, in particular to a method for calculating nitrogen transport in a plant through 15N isotope field in-situ labeling. The method specifically comprises the following steps: applying a 15N isotope labeled nitrogen fertilizer; all nitrogen accumulation amounts and < 15 > N accumulation amounts of nutritive organs and reproductive organs of the plant in two growth periods from the flowering period to the mature period are obtained, and the nitrogen transport amounts of the nutritive organs of the plant to the reproductive organs in the two growth periods are calculated; and calculating the accumulation amount of the nitrogen absorbed by the plant in the two growth periods in a nutritive organ and a reproductive organ so as to evaluate the source of the nitrogen in the reproductive organ of the plant. The method provided by the invention solves the problems that the accuracy of quantifying the nitrogen transfer in the plant body is low, the source of nitrogen in the reproductive organ of the plant cannot be accurately judged, and great errors exist in guiding variety breeding and nitrogenous fertilizer operation in the existing method.

The invention provides a drip irrigation cotton nitrogen fertilizer demand estimation method based on remote sensing diagnosis. The method comprises the following steps: S1, obtaining a Bayesian critical nitrogen concentration dilution curve; s2, plant nitrogen concentration remote sensing estimation: acquiring cotton growth data, unmanned aerial vehicle remote sensing RGB image data and meteorological data, estimating cotton plant nitrogen content (PNC) under each condition based on a Stacking ensemble learning model, and constructing a cotton plant nitrogen concentration estimation model; s3, nitrogen nutrition status diagnosis: calculating nitrogen accumulation deficiency (NAD) and nitrogen nutrition index (NNI) under different density conditions according to a universal critical nitrogen concentration dilution curve and a cotton plant nitrogen concentration estimation model; s4, dynamically predicting the nitrogen demand; S5, determining a precise nitrogen application scheme in the whole growth period of the cotton under different densities according to the nitrogen demand of the cotton under different density conditions; according to the method, the Bayesian critical nitrogen concentration dilution curve, the remote sensing diagnosis technology and the density effect are organically combined, and an overall solution suitable for precise management of drip irrigation cotton nitrogen under different density conditions is provided.

The invention discloses application of a ZmTCP20 gene in regulation and control of crop growth, development and yield, and belongs to the technical field of gene engineering. It is found that the corn TCP family member ZmTCP20 has the effect of directly and positively regulating the nitrogen utilization efficiency of crops, nitrogen absorption of the crops can be promoted through overexpression of the ZmTCP20 gene, the biomass and total nitrogen accumulation of plants can be remarkably increased, and the nitrate absorption capacity of root systems is improved; meanwhile, two-year field trials further show that the overexpression gene ZmTCP20 can significantly improve the plant height and biomass of crops, increase the nitrogen accumulation amount in the plants, enable crop clusters to be lengthened and thickened and further improve the yield of the clusters, and after the gene ZmTCP20 is knocked out, the contrary is that the overexpression gene ZmTCP20 is knocked out. The functional analysis of the gene ZmTCP20 provides important gene resources and theoretical guidance for the cultivation of new crop varieties with efficient nitrogen utilization.

The invention discloses an LNG (Liquefied Natural Gas) device for recovering methane through BOG (Boil Off Gas) denitrification by a low-temperature membrane method, which comprises a compressor, an aftercooler, a heat exchanger, a primary membrane separator and a secondary membrane separator, and the temperature of gas entering the two-stage membrane separator is-20 DEG C to-40 DEG C. According to the device, the low-temperature working condition is stably maintained by gas through cooperative pretreatment of the compressor, the aftercooler and the heat exchanger, and the separation selectivity of the membrane to methane and nitrogen is remarkably improved; by means of the two-stage membrane separation design, more than 75% of nitrogen in BOG can be efficiently removed, and the methane recovery rate of more than 85% is achieved. The device effectively reduces the nitrogen introduction amount of recovered BOG, ensures that the nitrogen content of a final LNG product is lower than 1mol%, meets the GB / T38753-2020 standard requirement, fundamentally avoids the problem of BOG emission due to nitrogen accumulation, greatly reduces methane loss, has the advantages of high separation efficiency, high resource utilization rate and high operation stability, and meets the BOG recovery treatment requirement of an LNG device.

The present application relates to the field of wisdom agricultural technology, disclose a kind of middle-low yield field hybrid rice canopy light nitrogen coupling high yield regulation method and system, the method includes: in tillering flourishing period to heading stage, obtain the real-time light transmittance of hybrid rice canopy;Based on the hysteresis compensation relationship of real-time light transmittance and leaf nitrogen accumulation quantity, construct nitrogen demand model, output target nitrogen application amount;According to target nitrogen application amount, generate nitrogen application timing instruction, the instruction includes fertilization time point and duration, and adjacent fertilization time interval is dynamically adjusted by light transmittance change rate;Nitrogen application timing instruction is executed and synchronously monitors leaf nitrogen accumulation quantity;Based on the dynamic deviation of leaf nitrogen accumulation quantity and preset nitrogen accumulation quantity threshold, the hysteresis compensation relationship of nitrogen demand model is feedback corrected before the next growth stage starts.The present application realizes the efficient coupling of canopy light resource dynamics and nitrogen precise supply, effectively improves the light nitrogen resource utilization efficiency of middle-low yield field hybrid rice.

The invention provides a wheat Fd gene and application of the wheat Fd gene in regulation and control of nitrogen utilization efficiency of wheat under a nitrogen deficiency condition, and belongs to the technical field of biological agriculture. 284 wheat varieties are subjected to nitrogen deficiency stress treatment and screened to obtain the gene Fd related to the nitrogen deficiency tolerance character. The Fd gene not only responds to wheat nitrogen deficiency condition stress and shows down-regulated expression, but also promotes growth and nitrogen accumulation of wheat under the nitrogen deficiency condition in a negative regulation mode, so that the nitrogen utilization efficiency of wheat is improved. The Fd gene provided by the invention can effectively regulate and control growth and nitrogen utilization of wheat under nitrogen deficiency conditions, provides a new strategy for construction and breeding of wheat nitrogen deficiency tolerance varieties, and also provides effective sites for nitrogen deficiency wheat environment detection and variety identification.

The invention relates to the technical field of fertilizer production, in particular to a controlled-release fertilizer for mechanical transplanting of rice as well as a preparation method and application of the controlled-release fertilizer. The controlled-release fertilizer for mechanical transplanting of rice is prepared from the following raw materials in percentage by mass: 17%-21% of urea, 9%-13% of 40-day anti-floating controlled-release urea, 9%-13% of 80-day anti-floating controlled-release urea, 8%-12% of diammonium hydrogen phosphate, 18%-22% of potassium chloride and 27%-31% of calcium magnesium phosphate fertilizer. The formula of the controlled-release fertilizer provided by the invention is basically consistent with a'double-peak 'nitrogen accumulation absorption curve from the tillering stage and the ear differentiation to the heading stage of the rice, and can meet the nutrient requirements of the whole growth period of the rice, so that the yield of the rice is increased by 11-22%; the nitrogen fertilizer absorption and utilization rate is increased by 15%-16%; the net income of farmers is increased by 11%-25%, and the method has very high practical application value.

The invention belongs to the field of water pollution treatment, and provides a multi-stage treatment method for breeding tail water, which comprises the following steps: coarsely filtering the tail water, and discharging the tail water into a settling pond for settling treatment to obtain settled water; discharging the precipitated water into an aeration tank through a filter dam, and carrying out nitrogen removal treatment of nitrification and denitrification; whether a heat source of the aeration tank needs to be lowered or closed is judged by directly judging whether the area of the medium-temperature area is enlarged or not, a signal for controlling the temperature is accurately sent out, and the area of the medium-temperature area can be accurately controlled through temperature control, so that medium-temperature dominant bacteria are indirectly reduced, and the biodegradation efficiency of ammonia nitrogen is improved; the problems of nitrogen accumulation and emission in a greenhouse gas accumulation area in the water pollution treatment process are indirectly reduced.

The invention relates to the technical field of intelligent agriculture, and discloses a light-nitrogen coupling high-yield regulation and control method and system for hybrid rice canopies in medium and low yield fields, and the method comprises the steps: obtaining the real-time light transmittance of the hybrid rice canopies from the tillering stage to the heading stage; a nitrogen demand model is constructed based on the lag compensation relation between the real-time light transmittance and the leaf nitrogen accumulation amount, and the target nitrogen application amount is output; a nitrogen application time sequence instruction is generated according to the target nitrogen application amount, the instruction comprises the fertilization time point and the duration, and the adjacent fertilization time interval is dynamically adjusted according to the light transmittance change rate; executing a nitrogen application time sequence instruction and synchronously monitoring the nitrogen accumulation amount of the leaves; and based on a dynamic deviation between the leaf nitrogen accumulation amount and a preset nitrogen accumulation amount threshold value, feeding back a lag compensation relation of the corrected nitrogen demand model before the next growth stage starts. According to the method, efficient coupling of canopy light resource dynamic and accurate nitrogen supply is achieved, and the light and nitrogen resource utilization efficiency of hybrid rice in medium and low yield fields is effectively improved.