31results about How to "Nitrogen fixation" patented technology

The composition of ecological fertilizer comprises (by weight portion) straw powder 30-70, fungous preparation 1-20, coal humic acid 5-30, urea 5-25, ground phosphate rock 3-25, potassium mineral powder 3-30 and lime 0.3-15. It is made up by adopting biological method, and is low in production cost, and is an organic composite fertilizer applicable to grain crops, vegetables, fruit tree, tobacco and economic crops of acid soil, alkali soil and neutral soil, and its fertilizer effect is good.

The present invention relates to a special-purpose fertilizer for soyabean. It is characterized by that it comprises nitrogen, phosphorus and potassium, also includes additive with slow-releasing action and special-purpose microfertilizer. The weight percentage of nitrogen, phosphorus and potassium is 0.4-1:0.1-0.3:0.2-0.4. Said invention is complete in nutrients and reasonable in formula, can fully meet nutrient requirement for soyabean growth and development process, also contains the nutrient components of nitrate nitrogen, sulfate radical, boron and molybdenum, so that it is favorable for soyabean nitrogen-fixing root nodule.

The invention discloses a kind of niobium-titanium microalloying HRB400-scale screw-thread steel and a manufacturing method thereof. The screw-thread steel comprises C, Si, Mn, P, S, Nb, Ti, N and the balance Fe and impurities. The manufacturing method of the niobium-titanium microalloying HRB400-scale screw-thread steel comprises the following steps of smelting in a revolving furnace, treatment outside the furnace, continuous casting, casting blank heating and rolling. During smelting in the revolving furnace, alloy such as silicomanganese and ferroniobium is added for niobium microalloying treatment. During treatment outside the furnace, argon is blown in an argon station, and refining is conducted in an LF furnace. In the process of refining in the LF furnace, a ferrotitanium core-spun yarn is fed for titanium microalloying treatment. According to the technical scheme, before tapping, alloy such as silicomanganese and ferroniobium is added for niobium microalloying treatment, the ferrotitanium core-spun yarn is fed in the process of refining in the LF furnace for titanium microalloying treatment, after titanium is fused into molten steel, proper niobium-titanium microalloying treatment is conducted, the yield of the niobium-titanium alloy is increased, and stable, sustainable and low-cost production of the screw-thread steel is achieved.

The invention relates to a method for producing an organic-inorganic mixed fertilizer by using a black liquid extracted through pulping of biological enzyme pre-treatment alkaline wheat straw, and belongs to the field of fertilizer production. The method comprises: black liquid extraction after pre-treatment of wheat straw with biological enzyme, pre-treated alkaline wheat straw pulp black liquid extraction, and organic-inorganic mixed fertilizer production, wherein the black liquid extraction after the pre-treatment of the wheat straw with the biological enzyme comprises wet method material preparing, biological pre-treatment, wheat straw extrusion treatment to produce the black liquid, and conveying of the black liquid to a black liquid storage groove, the alkaline wheat straw pulp black liquid extraction comprises alkaline cooking of wheat straw after the pre-treatment, screening of the black liquid and the coarse pulp after the extrusion through a pulp extrusion device, countercurrent washing of the coarse pulp through four pulp washing devices connected in series to extract the black liquid, and conveying of the black liquid to the black liquid storage groove, and the organic-inorganic mixed fertilizer production comprises that the black liquid mixed in the black liquid storage groove passes through a black liquid filter, the obtained black liquid is concentrated through an evaporation station, the concentrated black liquid is passes through a pulp spraying granulation machine and a hot and cold screening system, and the organic-inorganic mixed fertilizer finished product is packaged. According to the present invention, the waste is turned into treasure, and the produced fertilizer is rich in biological agents, and has effects of plant disease resistance promoting and high yield.

The invention discloses a microbial rooting agent. The microbial rooting agent is composed of the following raw material components in parts by weight: 1 to 10 parts of polymer bamboo fiber, 0.1 to 5parts of Bacillus subtilis, 0.1 to 5 parts of brown nitrogen-fixing bacteria, 0.1 to 5 parts of Bacillus mucilaginosus and 20 to 200 parts of bamboo fiber. The invention also discloses a preparation method for the above-mentioned microbial rooting agent. The preparation method comprises the following steps: step 1, respectively weighing the raw material components in parts by weight for subsequentusage; step 2, crushing the bamboo fiber, and carrying out sterilizing and drying at a high temperature so as to obtain bamboo fiber fine particles; step 3, respectively subjecting three kinds of weighed bacteria to expanding propagation, carrying out mixing so as to obtain a mixed bacteria solution, then adding the bamboo fiber fine particles, carrying out fermenting for 24 hours, and carrying out drying so as to obtain bacteria-attached bamboo fiber; and step 4, uniformly mixing the bacteria-attached bamboo fiber and the polymer bamboo fiber, and carrying out storage in a sealed manner so as to obtain the microbial rooting agent. The microbial rooting agent provided by the invention can continuously induce rapid rooting and vigorous growth and development of a plant for a long time.

The invention relates to a special fertilizer for kiwi fruit and a production method thereof. The special fertilizer for kiwi fruit is prepared from the following raw materials in parts by weight: 50-80 parts of brewery waste, 40-60 parts of sugar mill residue, 30-40 parts of manioc waste, 15-20 parts of lime sludge, 5-7 parts of urea, 3-5 parts of ferrous sulfate, 5-8 parts of zinc sulfate, 10-15 parts of calcium superphosphate, 8-10 parts of potassium chloride, 5-8 parts of composite amino acid, 0.9-1.2 parts of secondary element, 0.1-0.2 part of minor element and 10-20 parts of alcohol slops. The special fertilizer for kiwi fruit has the effects of nitrogen fixation, phosphorus activation and potassium releasing; the secondary and minor elements contained in the fertilizer supplement the nutrients in the kiwi fruit growth process, and are capable of enhancing the organic content in the soil and improving the soil environment; and after the fertilizer is applied to the kiwi fruit, the kiwi fruit has favorable growth vigor, and the fruit quality is improved, thereby greatly enhancing the economic benefit.

The invention discloses a method for repairing a cadmium-polluted rice field by intercropping sedum alfredii hance and astragalus sinicus. The sedum alfredii hance and the astragalus sinicus are planted in an idle rice field in winter, so that effective utilization of land resources and photo-thermal resources is realized, and idle land in the slack winter season and resource waste are avoided while soil of the low-concentration cadmium-polluted rice field is repaired; and the astragalus sinicus can be used as organic green manure; and the sedum alfredii hance and the astragalus sinicus are intercropped, so that cadmium in the soil is effectively removed, and therefore, post-cropping rice absorbs less cadmium.

The invention discloses a vanadium nitride and ferrovanadium nitride alloy reinforcing agent and a preparing method and application thereof, and belongs to the field of special alloy materials. The reinforcing agent comprises 23%-66% of Si, 0.1%-17.5% of Mn, 11%-37% of N, 0%-9.6% of Ti, 0%-7.3% of Cr, 0.03%-5.6% of Al, 0.1%-1.9% of C, smaller than or equal to 0.10% of P, smaller than or equal to 0.15% of S and the balance Fe and impurities. Nitrogen fixation alloy elements such as the element Si and the element Mn are preferably selected, and nitride is formed by the N and the nitrogen fixation alloy elements. Preferable selection of the nitrogen fixation alloy elements mainly has the following beneficial effects that the combination rate of the nitrogen fixation alloy elements and the N is high; secondly, the nitrogen fixation alloy elements are beneficial to and harmless to molten steel; and thirdly, the thermodynamics environment of molten steel deoxidization, desulfuration vanadium nitride optimization and vanadium nitride iron microalloying is facilitated, more nitrogen ions can be cured, and the utilization rate of the alloy elements is greatly increased.

The invention discloses a waxy sweet corn chlorella residue biological seed dressing fertilizer and a preparation method thereof, relates to the agricultural field, and aims to provide a safe and environmentally friendly waxy sweet corn biological seed dressing fertilizer with the advantages of high economic benefit, easy available raw materials, easy preparation and comprehensive utilization of chlorella residue and a preparation method thereof. The waxy sweet corn chlorella residue biological seed dressing fertilizer includes, by mass, 25 to 36 parts of plant ash, 19 to 27 parts of fly ash silicon calcium fertilizer, 15 to 22 parts of the chlorella residue, 9 to 13 parts of soybean cake and 1.4 to 2 parts of brassinolide; and the plant ash particle size is 0.1-1mm. The chlorella residue has nitrogen fixation effect, can fix free nitrogen in the atmosphere, reduces the application amount of a nitrogen fertilizer, reduces agricultural environmental pollution of the nitrogen fertilizer, and improves crop quality; the waxy sweet corn chlorella residue biological seed dressing fertilizer has the advantages of easy available raw materials and easy implementation, the prepared product meets the quality of a seed dressing agent, and by the comprehensive utilization of the chlorella residue, significant economic benefits can be achieved.

The invention discloses a method for repairing a cadmium-polluted rice field by intercropping sedum alfredii and broad beans. The sedum alfredii and the broad beans are planted on an idle rice field in winter, so that effective utilization of land resources and photo-thermal resources is realized, and the winter-fallowed land and wasting of resources are avoided while soil of the rice field polluted by low-concentration cadmium is repaired; the cadmium content of fruits meets the national food safety limit standard under the condition that the yield of the broad beans is slightly reduced; themethod has important significance for ensuring the food safety of China and the health of people; and the cadmium is passivated to a certain extent, so that the cadmium is absorbed less by rice whichis used as a later crop.

The invention relates to a method for controlling soil and fixing nitrogen by using blue algae, the method is characterized in that the blue algae are dried and crushed and then applied to the soil, the soil is loosened, and the use amount of fertilizers can be reduced.

The invention relates to the field of agriculture, and discloses a water retention and soil fixation method for a pear orchard in a mountain area. The method comprises the steps that 1, ditching and ridging are conducted according to the fruit tree line spacing being 2.0-3.8 m; 2, in early October, drilling planting is conducted in the rapes for fertilizer use, white clover and alfalfa mixing sowing mode, wherein the sowing rate of rapes for fertilizer use is 4-8 kg / ha, the sowing rate of white clovers is 8-20 kg / ha, and the sowing rate of alfalfa is 10-25 kg / ha; 3, after sowing is completed,the surface of soil is covered with rice straw, wherein the dosage is 2,000-4,000 kg / ha; 4, from early April to late May in the next year, the rapes for fertilizer use, white clover and alfalfa are harvested and all covered and subjected to earth backing. Accordingly, the method is suitable for a new-cultivating orchard in the mountain area in South China, the water and soil loss of the soil can be effectively reduced, the water retention and fertilizer conservation capacity of the soil is increased, physical and chemical properties of the soil are improved conveniently, and rapid growth of fruit trees is promoted.

The invention discloses a selenium-rich watermelon seedling substrate. The substrate is prepared from, by weight, 40-50 parts of vermicompost, 10-15 parts of vermiculite, 8-10 parts of humus soil, 10-15 parts of molasses fermentation liquor, 3-5 parts of sesames, 3-5 parts of tangerine pith, 3-5 parts of fermentative strains, 20-30 parts of soft sediments with water content of 90%, 15-20 parts of atriplex patens, 3-5 parts of duckweed, 1-2 parts of fosamine ammonium and 10-20 parts of inorganic fertilizer, wherein the fermentative strains comprise microzyme, lactic acid bacteria, actinomycete and bacillus subtilis with the mass ratio of microzyme to lactic acid bacteria to actinomycete to bacillus subtilis being (3-6):(4-6): (2-3):1. The invention further discloses a preparation method of the selenium-rich watermelon seedling substrate. The selenium-rich watermelon seedling substrate is comprehensive in nutritional ingredient and balanced and harmonious in proportion; sufficient and coordinated nutrition can be supplied to watermelons in the whole growth period, and the growth of the watermelons is effectively promoted; the good quality of the watermelons is ensured, the selenium-rich watermelon seedling substrate can also be efficient, and the yield is efficiently improved.

The invention discloses continuous cropping-preventing potato special-purpose fertilizer prepared from potato seedlings. The continuous cropping-preventing potato special-purpose fertilizer is prepared from 100kg of dry potato seedling powder, 10kg of urea, 10kg of diammonium phosphate, 10g of potassium sulfate, 4kg of sea mud, 2kg of glutinous rice bran, 2kg of calcium superphosphate, 0.5kg of sodium selenite, 1kg of seaweed meal, 0.5kg of iron chelate, 1.2kg of bamboo powder, 1.5kg of rapeseed cake, 0.5kg of shell powder, 1.5kg of bagasse and 0.6kg of sterilization powder. In preparation, the above ingredients are uniformly mixed through a mixer and the mixture is subjected to granulation. The continuous cropping-preventing potato special-purpose fertilizer can provide enough nutrients for potatoes, stimulate and promote potato growth through microbe decomposer and metabolite absorption and utilization of potato roots, improve a potato yield, and realize uniform growth, smooth appearance, big and beautiful fruits, drought and flood resistance and cold and heat resistance.

The invention discloses steel for 3.5 Ni and a production method thereof, and relates to the technical field of steel production, and the steel comprises the following chemical components in percentage by mass: 0.030%-0.080% of C, 0.10%-0.30% of Si, 0.50%-0.90% of Mn, less than or equal to 0.005% of P, less than or equal to 0.002% of S, less than or equal to 0.0050% of residual Nb, less than or equal to 0.003% of residual V, less than or equal to 0.005% of residual Ti, 3.30%-3.70% of Ni, 0.05%-0.20% of Cr, 0.05%-0.20% of Mo, less than or equal to 0.050% of Cu, 0.020%-0.050% of Al, 0.0008%-0.0020% of Mg, less than or equal to 0.0060% of N, less than or equal to Through a series of process improvements of smelting, rolling, heat treatment and the like, the process problem of intergranular cracks of the steel grade is solved, the advantage of batch smelting and manufacturing of the steel grade is obtained, the manufacturing stability is greatly improved, and the manufacturing cost is greatly reduced.

The invention relates to the field of fertilizers, in particular to a fertilizer special for hawthorns. The fertilizer is prepared from, by weight, 20-25 parts of straw, 10-20 parts of sawdust, 10-12 parts of expanded perlite powder, 1-2 parts of nitrification inhibitor DMPP, 0.3-0.5 part of tea saponin, 7-9 parts of kiln dust potassium, 5-7 parts of zinc chloride, 4-6 parts of indole butyric acid potassium, 8-10 parts of copper oxide, 2-4 parts of boron slag, 3-5 parts of golden cauliflower green manure, 2-6 parts of molybdenum trioxide and 1-3 parts of anti-bacterial fertilizers. According to the fertilizer special for the hawthorns, the defects of the prior art can be overcome, the preparation method is simple, the utilization rate of the prepared fertilizer special for the hawthorns is high, the input of conventional fertilizers is reduced, the nitrogen activity is improved, original nutrients in the soil can be activated so that crops can fully absorb and utilize the nutrients, the increase of the crop yield is promoted, the stress resistance of the crops is improved, and the soil can be effectively improved.

A preparation method of a planting fertilizer used for garden landscape trees comprises the following steps that firstly, chernozem, sedumviviparum, waste tobacco leaves, peat soil, affine cudweed, spiral seaweed and biotechnology fulvic acid are mixed, mashed, placed in a fermentation pool and mixed with water for stirring, and a mixture is obtained; secondly, carbendazim and a microbial strain agent are added into the mixture, seal fermentation is conducted, and a fermented material is obtained; thirdly, urea, calcium superphosphate, diammonium phosphate, potassium sulfate, magnesium sulfate, ferrous sulfate and a Chinese medicine residue extracting solution are added into the fermented material and then placed in a mixing device for mixing and stirring, and a stirred material is obtained; fourthly, vermiculite, plant ash and sawdust are mixed and then added into the stirred material for mixing, and a semi-finished product is obtained; fifthly, the semi-finished product is dried, cooled, screened and bagged, and then the finished product can be obtained. By means of the planting fertilizer, the growth of plants can be promoted, the plants are protected from being infracted by harmful bacteria, the fertility of soil is effectively improved, and the planting fertilizer is suitable for being applied on the garden landscape trees.

The invention relates to the technical field of biomass fertilizers, and particularly relates to a potato growing biomass organic fertilizer and a preparation method thereof. The potato growing biomass organic fertilizer comprises the following components in parts by weight: 80-100 parts of animal excrement, 60-80 parts of straw, 90-120 parts of water hyacinth, 10-20 parts of vinasse, 30-50 partsof swill, 75-90 parts of bean pulp, 10-15 parts of an organic phosphorus agent and 0.5-2 parts of a fermentation agent. The potato growing biomass organic fertilizer provided by the invention has thebeneficial effects that sufficient organic nutrients can be provided for potatoes, and through the absorption and utilization of the microbial decomposition products and metabolites by the roots of the potatoes, the growth of the potatoes is stimulated and promoted, the amount of the potatoes is large, the growth is uniform, the surface is smooth, the potatoes are plentiful and beautiful, and drought and flood resistance and cold and heat resistance are achieved. Through mass propagation of beneficial microorganisms in soil, the organic nitrogen content of the soil can be increased, the activity and the effectiveness of phosphorus and potassium in the soil are promoted, and effects of nitrogen fixation, phosphorus dissolving and potassium dissolving can be exerted, so that the utilizationrate of fertilizer is improved, and the produced potatoes can be more plentiful in nutrient.

The invention discloses biological organic slow release fertilizer. The biological organic slow release fertilizer is characterized by being prepared from components by weight as follows: 100 kg of peat, 40 kg of humic acid, 5 kg of plant ash, 5 kg of Chinese medicine residues, 20 kg of livestock manures, 0.5 kg of active calcium, 0.3 kg of tea polyphenol, 0.2 kg of vegetable oil, 2 kg of sea mud, 1 kg of modified starch and 1.2 kg of biological bacteria strains. The biological organic slow release fertilizer has the characteristics that sufficient organic and inorganic nutrients can be provided for crop growth, crop growth is stimulated and promoted, the content of organic nitrogen in soil is increased, activity and effectiveness of phosphorus and potassium in the soil are improved, functions of nitrogen fixation, phosphorus releasing and potassium releasing are realized, and the utilization rate of the fertilizer is increased.

The invention provides water-soluble composite fertilizer. The water-soluble composite fertilizer consists of the following components in parts by weight: 10 to 16 percent of potassium sulfate, 7 to 13 percent of ammonium sulfate, 7 to 13 percent of potassium nitrate, 60 to 66 percent of ammonium sulfate, 1 to 4 percent of humic acid and 1 to 4 percent of brassin. The humic acid and the brassin are added on the basis of the traditional composite fertilizer, and the humic acid, the amino and the potassium element are reacted to generate potassium humate andsodium humate, so that the effects offixing nitrogen and fixing potassium are achieved and loss of fertilizer efficiency can be effectively prevented; the brassin not only has the physiological function of auxin and cytokinin, but also has the functions of improving photosynthesis, regulating nutrient distribution, promoting stem and leaf carbonhydrate to be transferred to grains, improving the stress resistance of crops on externaladverse factors, promoting the growth capability of weak parts of plants and the like, and the brassin further improves absorption of the fertilizer effect by the crops after the humic acid performs nitrogen-fixing and potassium-fixing effects, so that the utilization rate of the composite fertilizer is increased.

The invention relates to the field of fertilizers, in particular to a chemical fertilizer special for rhizoma arisaematis. The chemical fertilizer is prepared from, by weight, 20-25 parts of crop stalks, 10-20 parts of sawdust, 10-12 parts of expanded perlite powder, 1-2 parts of nitrification inhibitor DMPP, 0.3-0.5 part of tea saponin, 27-29 parts of ammonium chloride, 24-26 parts of monoammonium phosphate, 21-23 parts of calcium magnesium phosphate fertilizer, 18-20 parts of cake fertilizer, 15-17 parts of zinc carbonate, 12-14 parts of ammonium phosphate salt, 10-12 parts of copper chelate, 8-10 parts of manganese oxide, 5-7 parts of silicon fertilizer, 3-5 parts of chlormequat, 4-6 parts of boron slag, 2-4 parts of molybdenum trioxide, and 1-3 parts of organic phosphorus bacteria fertilizer. The chemical fertilizer is rich in nutritious materials and simple in preparation, improves the soil, and increases the content of organic matter in the soil; the chlormequat contained in the formula prompts tubers of the rhizoma arisaematis to increase and prompts the rhizoma arisaematis to resist lodging, and thus the yield of the rhizoma arisaematis is greatly increased.

The invention belongs to gardening, relates to the technical field of fruit tree ecological cultivation, and discloses a method for planting a trifolium repens in a southern orchard. The method comprises the following steps of spraying and killing weeds in the orchard once by using an internal suction type orchard herbicide from two months before sowing, spraying and killing the weeds for the second time after 20-25 days, and spraying and killing the weeds for the third time by using a contact herbicide two days before sowing; soaking trifolium repens seeds with water for 10-11 hours before sowing; the sowing time being spring or the middle ten days of October to the middle ten days of December; spraying the garden soil once when the soil is wet after rain or by utilizing irrigation facilities; spraying water once after sowing; spraying selective herbicides special for killing gramineous weeds for 1-2 times before the turf is formed, and manually pulling out broadleaf weeds and other malignant weeds; spreading urea once after 25 days of seedling emergence, wherein 2.5 kg of urea is applied per mu; fertilizing once in early September after summer; spraying water after fertilizing; and mowing when the height of the trifolium repens reaches 25-30 cm. According to the method for planting the trifolium repens, the trifolium repens can be successfully planted in southern orchards.

The invention relates to the field of fertilizers, and especially relates to a fertilizer special for broad beans. The fertilizer comprises the following components in parts by weight: 20-25 parts of straw, 10-20 parts of sawdust, 10-12 parts of expanded perlite powder, 1-2 parts of a nitrification inhibitor DMPP, 0.3-0.5 parts of tea saponin, 23-25 parts of liquefied ammonia, 20-22 parts of a phosphate fertilizer, 17-19 parts of a potash fertilizer, 13-15 parts of decomposed goose manure, 7-9 parts of cement kiln ash potash, 11-13 parts of a Vicia villosa green manure, 9-11 parts of diammonium phosphate, 7-9 parts of fungi with ectendotrophic mycorrhiza, 6-8 parts of copper sulphate, 4-6 parts of boric acid, 2-4 parts of molybdenum disulfide, 1-3 parts of chlormequat chloride, and 3-5 parts of humic acid. The fertilizer has the advantages of abundant nutrients, promotion of well development of broad bean roots, good branchiness, low podding part without easy pod crack, full seeds, and milkiness color of seed coats; the formula contains chlormequat chloride, so that lodging resistance capability of broad beans are effectively enhanced, and yield of broad beans are substantially improved.

A preparation method of a rice disease-resistant seedling-cultivation substrate includes the following steps of firstly, taking field soil and rice straw as the main raw materials, smashing field soil, and continuously drying smashed field soil at a temperature of 85-95 DEG C for 10-14 minutes; secondly, collecting harvested rice straw, cutting the straw into segments 2-3 cm long, and spraying water on the cut straw segments according to the rule that 1.5-1.8 kg of water is sprayed on every 10 kg of rice straw; thirdly, sending the wet rice straw segments into a tumbling machine to be tumbled, and vacuumizing once every 9-10 minutes during tumbling; fourthly, sending the tumbled rice straw into a drying device to be continuously dried for 30-50 minutes at a temperature of 45-55 DEG C; fifthly, smashing the dried rice straw to prepare straw meal, mixing the straw meal with field soil in the first step according to the weight ratio of 1:(3-5), screening the mixture by means of a screen of 80-100 meshes, and putting mixed powder into a stainless steel container, adding water for dilution, pumping the material into a centrifugal type spray drying tower to be dried, and granulating the dried material to obtain the rice seedling-cultivation substrate.

The invention relates to a microbial fermentation functional organic compound fertilizer and a production method thereof. The method comprises the following steps of: mixing lactobacillus buchneri (i) Lactobacillusbuchneri ( / i) CICC (China Center of Industrial Culture Collection) 6004, bacillus cereus (i) Bacilluscereus ( / i) ACCC (Agricultural Culture Collection of China) 10117, saccharomycescerevisiae (i) Saccharomyces ( / i) (i) cerevisiae ( / i) CICC1905, and serratia marcescent (i) Serratia ( / i) (i) marcescent ( / i) ACCC10119; and fermenting to produce an bio-organic fertilizer. With the adoption of the mixing-fermenting method, the estrogen and medicine residues in excrements of livestocks can be effectively degraded; nematode and fly maggot in the soil can also be eliminated; in addition, the shelf life of the organic fertilizer and the survival time of viable organism can be greatly prolonged, and the germination rate and stress resistance of crops seeds can also be improved, etc.

The invention discloses steel for 7Ni and a production method thereof, and relates to the technical field of steel production, the steel comprises the following chemical components by mass percent: 0.030%-0.060% of C, 0.05%-0.30% of Si, 0.70%-1.0% of Mn, less than or equal to 0.005% of P, less than or equal to 0.002% of S, less than or equal to 0.0050% of residual Nb, less than or equal to 0.003% of residual V, less than or equal to 0.005% of residual Ti, 6.50%-7.50% of Ni, less than or equal to 0.05% of Cr, 0.20%-0.30% of Mo, less than or equal to 0.05% of Cu, 0.020%-0.050% of Al, 0.0008%-0.0020% of Mg, less than or equal to 0.0060% of N, less than or equal to 0.0002% Through a series of process improvements of smelting, rolling, heat treatment and the like, the process problem of intergranular cracks of the steel grade is solved, the advantage of batch smelting and manufacturing of the steel grade is obtained, the manufacturing stability is greatly improved, and the manufacturing cost is greatly reduced.

The invention discloses a watermelon cultivation matrix which is prepared from 40 to 50 parts of earthworm cast, 10 to 15 parts of vermiculite, 8 to 10 parts of perlite, 10 to 15 parts of molasses fermentation liquor, 3 to 5 parts of cigarette ash, 3 to 5 parts of tangerine pith, 3 to 5 parts of fermentative strains, 20 to 30 parts of soft sediment with the moisture content of 90 percent, 15 to 20 parts of pine needles, 3 to 5 parts of sea-buckthorn, 3 to 5 parts of cactus, 3 to 5 parts of aloes, 3 to 5 parts of radix ophiopogonis, 3 to 5 parts of purslane, 3 to 5 parts of cucumis hystrix, 1 to 2 parts of fosamine and 10 to 20 parts of inorganic fertilizer, wherein the fermentative strains comprise yeast, lactic acid bacteria, actinomycetes and bacillus. The invention further discloses a preparation method of the watermelon cultivation matrix. The watermelon cultivation matrix is comprehensive in nutritional component and balanced and coordinated in proportion, so that watermelons can obtain full and coordinated nutrition supplies in the whole growing period; the growth of the watermelons can be effectively promoted; high quality of the watermelons is guaranteed, and high efficiency and yield increase can be also realized.

The invention relates to the field of fertilizer, and especially provides a fertilizer special for honey dew melons. The fertilizer comprises the following components in parts by weight: 20-25 parts of straw, 10-20 parts of sawdust, 10-12 parts of expanded perlite powder, 1-2 parts of a nitrification inhibitor DMPP, 0.3-0.5 parts of tea saponin, 38-40 parts of decomposed chicken manure, 32-34 parts of decomposed horse manure, 13-15 parts of scorched clay dust, 14-16 parts of carnallite powder, 11-13 parts of copper sulphide, 5-7 parts of 1-naphthalene acetic acid, 2-4 parts of a preparation for decomposing crop straw, 3-5 parts of PCPA, and 1-3 parts of Fenxiuling wettable powder. The fertilizer has the advantages of abundant nutrients, scientific proportioning, and low cost; the fertilizer improves rind thickness and melon sweetness, enriches juice and tenders flesh, and enhances stress resistance of the honey dew melon; the formula contains PCPA, has the effects for retention of flowers and fruits, and substantially improves yield of honey dew melons.