11 results about "Soil nitrogen" patented technology

The application discloses an agricultural water quality and water quantity dual risk and cascade transmission evaluation method, belongs to the technical field of water resource management, and aims at solving the problem that traditional methods only stay in water quantity depletion caused water resource pressure accounting and ignore the risk caused by substandard water quality; the application comprises the following steps: based on a farmland soil nitrogen budget and hydrodynamics coupling model, quantifying the pollution emission list of subdivided sources in the growth process of specific crops, simulating agricultural pollution dilution water consumption; using a crop water requirement model to calculate the irrigation water consumption of specific crops in the whole growth period; using a source and sink corrected physical flow trade model to analyze the virtual water transfer path hidden in each agricultural product trade link; integrating the production end and the consumption end results to realize high-precision grid agricultural water resource supply and demand imbalance risk evaluation and cascade effect analysis; and the cascade transmission effect of the application in evaluating the water resource risk provides strong support for reasonable allocation of agricultural water resources and improvement of nitrogen fertilizer utilization efficiency.

The application discloses an adaptive method for relieving double risks of water quality and water quantity of agriculture, and belongs to the technical field of water resource management.The method is based on a farmland soil nitrogen balance and hydrodynamics coupling model, quantifies a pollution emission list of subdivided sources in the growth process of specific crops, and simulates agricultural pollution dilution water quantity; a crop water requirement model is used to calculate irrigation water consumption of the specific crops in the whole growth period; a water resource loss evaluation module is established to evaluate potential agricultural yield reduction and economic loss caused by water resource shortage; a scenario library of water and fertilizer coordination strategies is constructed to compare the relieving effects of different adaptive strategies on water quantity depletion type and water quality pollution type water resource risks.The application solves the technical problem that it is difficult to simultaneously cope with water quantity risks and water quality risks to develop targeted adaptive strategies, can effectively relieve water resource pressure, improve the sustainability of agricultural production, realize optimal allocation of water resources, and further guarantee the health of an ecological system.

This invention relates to a method and system for measuring nitrogen oxide emissions from soil in the field using an extraction-absorption method, belonging to the field of environmental monitoring technology. A soil sampling unit is sealed and placed on the surface of the soil to be tested. Gas is extracted from the soil sampling unit by a power unit, causing outside air to replace the gas inside the soil sampling unit, forming an airflow flowing across the surface of the soil. The airflow is sequentially guided to a first absorption bottle, an oxidation bottle, and a second absorption bottle connected in series. The concentration of nitrite ions in the first and second absorption solutions is measured respectively. Based on the measured nitrite ion concentration, sampling flow rate, sampling time, and the area of ​​the soil covered by the soil sampling unit, the nitrogen oxide emission flux is calculated. This invention achieves stable, efficient, and low-cost offline quantitative measurement of nitrogen oxide emissions from soil in the field, providing reliable technical support for research on land-atmosphere exchange, soil nitrogen cycle, and atmospheric pollution source tracing.

The application discloses a microbial preparation for straw decomposition and soil nutrient improvement and application thereof, and relates to the technical field of agricultural waste resource utilization and soil improvement. Streptomyces sp. PLXSD-1, and the microbial preparation is prepared by compounding the streptomycete and a tobacco leaf extract, and the microbial preparation can promote straw degradation and improve soil nutrient conditions. The activity of the streptomycete is improved by using the tobacco leaf extract, and the rapid decomposition of the straw and the supply capacity of soil nitrogen and phosphorus are improved. Specifically, compared with the streptomycete alone, the phosphorus solubilizing capacity is increased by 19.43% and the straw degradation rate is significantly increased by 25.82% after the streptomycete is compounded with the tobacco leaf extract. In addition, the streptomycete PLXSD-1 and the tobacco leaf extract have a synergistic effect on improving the straw degradation rate.

The application discloses a kind of rice field reduction nitrogen control method and system, comprising the following steps: detection data acquisition step: the recharge water of reservoir is carried out online nitrogen monitoring, obtains the nitrogen concentration and water flow of recharge into farmland water body, and the nitrogen concentration and flow of drainage water are monitored in field outlet;Central control unit processes data step: the detection data obtained in the previous step is processed using central control unit, obtains the nitrogen flux of recharge into field and the nitrogen flux of field drainage, and obtains the recharge water nitrogen input / output load and recharge water nitrogen element utilization rate, combines with crop growth period nitrogen supply target and soil nitrogen supply estimate, calculates topdressing amount or postpones timing;According to topdressing amount, control fertilizing device and solenoid valve, realize chemical nitrogen fertilizer reduction and irrigation and drainage coordination.The application reduces nitrogen loss and end discharge load under the premise of guaranteeing yield and quality, realizes the efficient green use of water and fertilizer resources.

This invention discloses an alkali-modified biochar for highly efficient ammonia nitrogen adsorption, its preparation method, and its application, belonging to the field of environmental functional materials technology. Using rice straw as raw material, the invention prepares alkali-modified biochar through strong alkali impregnation combined with high-temperature activation in a nitrogen atmosphere, significantly increasing its specific surface area, mesoporous structure ratio, and number of oxygen-containing functional groups. In the alkali-modified biochar, mesopores with a pore size of 2-5 nm account for ≥65.5% of the total pore volume, giving it both high adsorption capacity for ammonia nitrogen and stable, controllable slow-release performance. In crop cultivation, the alkali-modified biochar, after granulation, can be used as a slow-release nutrient material for soil nitrogen retention, reducing nitrogen leaching loss and thus improving nutrient utilization efficiency and promoting crop growth. It can also be applied to the adsorption and removal of ammonia nitrogen in water bodies. Furthermore, the preparation process of the alkali-modified biochar is simple, the raw materials are readily available, and it is environmentally friendly, possessing dual value in pollution control and resource utilization in the field of green agricultural planting.

The invention provides a biological organic fertilizer containing a compound strain as well as a preparation method and application of the biological organic fertilizer, and belongs to the technical field of biological organic fertilizers. The bacillus velezensis and the bacillus amyloliquefaciens are added, the bacillus velezensis can tolerate certain salinity and alkalinity, the soil fertility can be improved through nitrogen fixation, the utilization rate of phosphorus can be improved by dissolving inorganic phosphorus, the tolerance of plants to environmental stress is enhanced through iron-producing carriers, the growth of seedlings is promoted, and the growth and development of the plants are promoted; the bacillus amyloliquefaciens has the functions of resisting salt and alkali to a certain degree, dissolving phosphorus, dissolving potassium and the like. The bio-organic fertilizer disclosed by the invention is beneficial to remarkably increasing the contents of chlorophyll, proline and soluble sugar of the pakchoi and also reducing the content of malondialdehyde of the pakchoi, so that the oxidative damage of plants is reduced, the stress resistance and quality are improved, the contents of nitrogen, phosphorus and potassium in soil are integrally improved, and the acidification of the soil is remarkably relieved.

This invention discloses a method and system for maintaining the stability of alpine grassland communities based on nitrogen deposition and precipitation gradient regulation, belonging to the field of ecological and environmental engineering technology. The method includes the following steps: collecting growth change data of different plant communities, soil nitrogen content change data, and precipitation temporal distribution data; standardizing all types of data under a unified time scale; and forming a draft of plant community growth rhythm based on the standardization results. This invention achieves dynamic equilibrium of alpine grassland communities in the temporal dimension by synchronously regulating the nitrogen input rhythm and precipitation distribution rhythm, constructing a joint regulation mechanism of reverse peak avoidance and sliding compensation. This method disperses community growth peaks, weakens resonance effects, restores asynchronous responses, improves energy utilization and structural stability, and ensures the long-term sustainable maintenance of ecological functions.

This invention belongs to the field of microbial agent application technology, and particularly relates to a method and agent for promoting efficient nitrogen utilization in flue-cured tobacco by regulating soil nitrogen transformation based on the LL-8 strain. The agent is prepared by inoculating the LL-8 strain into a culture medium. The preservation information of the LL-8 strain is as follows: Preservation unit: China General Microbiological Culture Collection Center (CGMCC); Address: No. 3, Courtyard 1, Beichen West Road, Chaoyang District, Beijing, Institute of Microbiology, Chinese Academy of Sciences; Preservation date: January 28, 2026; Preservation number: CGMCC No. 37560. This invention, through the LL-8 strain and its corresponding application method, precisely addresses the core problems of ammonium nitrogen accumulation and nitrate nitrogen deficiency in dryland tobacco-growing soils, as well as the lack of specificity and unstable nitrogen regulation effect of ordinary microbial agents, thereby achieving efficient nitrogen utilization in flue-cured tobacco.

This invention discloses a system and method for synergistic regulation of nitrous oxide emission reduction and soil nitrogen leaching in farmland, relating to the field of farmland nitrogen management technology. The method integrates meta-analysis and enhanced regression tree models. Through steps such as collecting relevant research data on biochar application, screening effective sample data, constructing a meta-analysis database, identifying key influencing factors, establishing mathematical quantitative relationships, constructing an enhanced regression tree model, and developing simulation optimization schemes, it achieves accurate prediction and synergistic regulation of N2O emissions and soil nitrogen leaching under different farmland conditions. This invention can quantify the relative importance of each influencing factor, dynamically generate quantitative and operable field management plans adapted to different production scenarios, and ensure the stability of emission reduction effects through long-term monitoring and dynamic feedback mechanisms. It promotes efficient nitrogen utilization and sustainable development in farmland, possesses broad application value, is easy to implement and promote in large-scale farmland, and provides a reliable path for effective greenhouse gas emission reduction.

The present application belongs to the field of machine learning, and particularly relates to a wheat variety soil fertility and nitrogen fertilizer gene detection and optimization system based on machine learning. The system comprises a soil fertility basic data acquisition terminal, a basic productivity evaluation server, a regional soil fertility grading device, a variety phenotype monitoring device, a nitrogen fertilizer utilization efficiency analysis platform, a gene feature extraction module, a machine learning optimization master control system and a decision output terminal. By obtaining soil fertility basic data, variety phenotypes and gene feature vectors, the system uses a machine learning model to perform multidimensional data mining and nonlinear correlation modeling, and outputs variety optimization classification suggestions under different soil fertility levels. Through the above system architecture, the present application realizes precise coupling of variety screening and arable land fertility, improves the precision of nitrogen fertilizer utilization efficiency prediction, provides a scientific basis for reducing the amount of chemical fertilizers and increasing efficiency, and can realize optimal allocation of agricultural production resources.