4680 results about "Growth speed" patented technology

In the present embodiment, in the production of a heat-resistant composite material resulting from impregnating a ceramic fiber preform with silicon carbide, a mixed gas containing starting material gas, an additive gas, and a carrier gas is supplied to a substrate having a minute structure such as a preform stored in an electric furnace, silicon carbide is deposited to form a film by means of a chemical vapor deposition method or a chemical vapor infiltration method, and the film formation growth speed and embedding uniformity are controlled by means of the amount of additive gas added to the starting material gas, the starting material gas contains tetramethylsilane, and the additive gas contains a molecule containing chlorine such as methyl chloride or hydrogen chloride. The film formation growth speed and embedding uniformity of the silicon carbide are both achieved.

It is intended to provide a substrate treatment device capable of adjusting both of a growth speed and an etching speed in a selective epitaxial growth, avoiding particle generation from nozzles, and achieving good etching characteristics. A substrate treatment device for selectively growing an epitaxial film on a surface of a substrate by alternately supplying a raw material gas containing silicon and an etching gas to a treatment chamber, the substrate treatment device being provided with a substrate support member for supporting the substrate in the treatment chamber, a heating member provided outside the treatment chamber for heating the substrate and an atmosphere of the treatment chamber, a gas supply system provided inside the treatment chamber, and a discharge port opened on the treatment chamber, wherein the gas supply system comprises first gas supply nozzles for supplying the raw material gas and second gas supply nozzles for supplying the etching gas.

The invention relates to aquaculture feed, in particular to litopenaeus vannamei feed without fish meal. The feed comprises an animal protein source, a plant protein source, a fat source raw material, a sugar source raw material, composite vitamin, composite mineral salt, Chinese medicine compound preparation, premix and additives. The feed has the advantages as follows: 1,palatability, ingestionspeed, growth speed and digestibility are high, the soluble loss of the feed in water is reduced, and mature time is short; 2, the amino acid is balanced, the nutritional requirement of the litopenaeus vannamei on the amino acid is met, the synthesis of the protein by the litopenaeus vannamei is effectively promoted, and discharge of the nitrogen is reduced; 3, disease resistance and survival rate are high and the culture benefit is obvious; 4, absorption and utilization rate is increased, discharge of phosphorous is effectively reduced and pollution to water is reduced; 5, the feed does not comprise artificial color and chemical additives and does not generate adverse influence on the nutritional value of the litopenaeus vannamei; and 6, dependence on the fish meal is reduced and the feeding cost is reduced.

The invention discloses an intensive pig farm weanling pig feed and belongs to the field of feeds. The feed is composed of a milk replacer, a weanling feed and a piglet feed. According to the feed, a feed product suitable for different growth phases of a weanling pig are provided according to growth and development characteristics of the different growth phases of the weanling pig so as to promote the development of an intestinal system of the weanling pig and effectively solve the stress reaction appearing in a weaning process of the weanling pig; meanwhile, the utilization rate of the feed is high, the growth speed of the weanling pig can be accelerated, the immunity of the weanling pig can be enhanced and the foundation is laid for the rapid growth of a fattening period. Furthermore, the invention further provides a feeding mode of the feed, namely 6kg of the milk replacer is fed from the 7th day after the weanling pig is born to a 42-45-day age of the weanling pig; 20kg of the weanling feed is fed from the 42-45-day age to a 66-70-day age of the weanling pig; 40kg of the piglet feed is fed from the 66-70-day age to a 94-100-day age. The mode is scientific and reasonable, simple and efficient.

A carbon nanotube array structure is composed of a substrate, the alloy catalyst particles on the substrate, which contains the material to affect the growth speed of carbon nanotubes, and the array the carbon nanotubes which is grown from said alloy catalyst particles and bent toward a predefined direction. Its growing process includes such steps as generating a catalyst layer on the substrate, depositing at least two kinds of growth speed regulating material, annealing in oxygen contained gas to change the catalyst layer to catalyst particles, introducing carbon source gas, and growing carbon nanotubes.

A plant growth facilitating apparatus, for receiving and growing a plant, includes an accommodating body and a light emitting unit. The accommodating body defines an accommodating space for receiving the plant. The light emitting unit has a first LED set for emitting a red light in increasing the growth speed of the plant and a second LED set for emitting a blue light in promoting the photosynthesis of the plant. The wavelength range of the red light is 620-760 nanometer, and the wavelength range of the blue light is 360-480 nanometer. The light emitting unit is used for emitting light toward the accommodating space of the accommodating body, and the longest path of the light from the light emitting unit to the accommodating body is smaller than 1 meter.

The invention discloses a method for propagating market hogs. According to the different growth and physiological stages of the market hogs, the growth of the market hog comprises the stages of lactation and luring, weaning and stress, pigling breeding, growing development and beef gain, fodder with good nutrition, smell, and luring performance is provided in the stage of lactation and luring; fodder with diarrhea resistance and high nutrition concentration and capable of keeping the healthy of intestinal tract is provided in the stage of weaning and stress; fodder capable of strengthening immunity, promoting growth and exercising the intestinal tract is provided in the pigling breeding; fodder for increasing nutrition and protein synthesis is provided in the stage of growing development;the fodder with high energy and high amino acid is provided in the beef gain. According to the method, the fodder is schemed according to the physiology and development stage and the stress conditions; the method has the advantages of low mortality, quick growth speed, short propagation period, low feed conversion ratio, high weight and the like; in addition, the propagation cost of the market hog is lowered, and the economic benefits of propagating market hog are improved.

The present invention belongs to the field of aquatic cultivation technology, and is one purified system for high density green cultivation of sea water and fresh water fish in a complexly closed circulation facility. The lone purified water system consists of cultivation pond, deposition pond, aerating pond and biologically purifying pond to constitute one complete circulation system. Each of the cultivation pond, deposition pond and biologically purifying pond is provided with blowdown pipeline to exhaust deposited solid dirt. The present invention has raised fish survival rate and growth speed.

The invention discloses a method for rapidly growing and cultivating dendrobium officinale, which comprises the following steps of: taking back mature shadow fruit seeds in the country of origin for wild dendrobium officinale, and placing the seeds in a clean culture dish; after natural crack, pouring the seeds into a clean beaker, sealing the clean beaker, and storing the beaker in a low temperature box; performing a certain sterilization procedure on the stored seeds, placing the seeds in an MS minimal medium, performing seed germination cultivation, wherein the seeds gradually become green and form protocorm, and observing that needles appear in the protocorm by using magnifying glass; transferring the protocorm into the MS minimal medium, performing protocorm proliferation and differentiation culture, observing that plantlets are differentiated from the protocorm in a bottle along the production of partial new protocorm; and transferring the plantlets into the MS minimal medium, and performing strong seedling and rooting culture, seedling hardening and transplanting. The survival rate is over 97 percent without the seedling hardening process, and the yield is doubled. The growth speed is improved by 50 percent, the content of each component is equivalent to that of the wild dendrobium officinale, and the contents of amino acid and microelement are higher than those of the wild dendrobium officinale.

The invention discloses a method for segregated early weaning of piglets, which comprises the steps of medicine adding, segregation, early transfer and the feeding of early weaning by piglet feed, wherein the medicine adding is performed before and after the delivery of a sow, the advanced medicine adding is used to kill off microorganisms which is expected to be killed, and the medicine adding is also performed from the birth of a suckling piglet to the weaning; the segregation adopts that the parturient sow is transferred into a clean farrowing house for delivery from the pregnancy, and the piglet at the age of between 10 and 14 days is transferred into a clean and comfortable breeding house from the farrowing house; when the level of a maternal antibody of the piglet at the age of between 10 and 14 days is in higher state, the piglet is moved away from the sow and is transferred into a cleaner environment; and the piglet feed for segregated early weaning adopts four stages to feed. The piglet has early weaning segregation time, high survival rate, and quick growth speed, the segregated early weaning of the piglet can save feeding cost of the sow, improve the yearly parity number of the sow, improve the utilization rate of the farrowing house, and reduce the probability that the piglet is infected with sow diseases, and a segregated early weaning technology of the piglet is suitable for the application of modern pig farms.

The invention relates to aquaculture feed, in particular to litopenaeus vannamei compound feed special for winter shed cultivation and a preparation method of the feed. The feed comprises a protein source raw material, a fat source raw material, a sugar source raw material, an antioxidant, a phagostimulant, composite vitamin and composite mineral salt. The invention provides the litopenaeus vannamei compound feed special for winter shed cultivation and the preparation method of the feed, with the advantages of high survival rate, high growth speed, high stability in water, high ingestion speed, convenience for use and low environmental pollution, so as to solve the problems of low growth speed, serious disease, low survival rate and the like of the litopenaeus vannamei during winter shed cultivation at low temperature and promote the healthy development of the litopenaeus vannamei cultivation industry.

The invention relates to an ecological breeding method for mixedly breeding tilapia mossambica and litopenaeus vannamei boon, which is used for breeding fish and prawn in a pond. The invention discloses an ecological breeding mode for mixedly breeding the tilapia mossambica and the litopenaeus vannamei boon. In every spring (from late March to early April), when water temperature stably recoveries at more than 20 DEG C, the pond can be sterilized by calcium oxide in a drying way with quantity being 75-100 kilogram for each acre, after 5-7 days when toxicity is unavailable, the litopenaeus vannamei boon larvaes and the tilapia mossambica seeds are stocked by means of mixed breeding, wherein the litopenaeus vannamei boon is stocked at least for one time. Feeding quantity in each day is depended on 3-5% of the weight of the tilapia mossambica twice a day, and can be properly increased or decreased according to weather, water quality and feeding condition without special feed for the litopenaeus vannamei boon, the pond is sterilized by calcium oxide with quantity being 15-20 kilogram for each acre, once to twice in each month, and the pH value of the pond is adjusted to be alkalescence. The method can naturally obtain the best ecological benefit of cultural environment, reduces disease of fish and prawn, increases physique, improves growth speed, enlarges the individual size, and increases average yield.

The invention belongs to the animal sitology technical field, in particular to big pig premix and an application method thereof. The premix mainly comprises the following components: iron element, copper element, zinc element, manganese element, iodine element, cobalt element, selenium element, composite vitamine premix, DL-methionine, lysine, threonine, cholinehydrochloride, calcium hydrophosphate, rock flour, salt, carrier and phytase. The big pig premix and conventional basic ration are used to prepare big pig compound feed to feed big pigs with conventional process, and the content of the big pig premix in the big pig compound feed is 4% according to the weight percentage. The big pig premix provided by the invention is simple and safe to use; after feeding big pigs, the fodder-meat rate can be reduced, the big pig growth speed and lean meat percentage are increased and the meat quality safety can be improved.

The invention discloses an artificial cultivation method for Phellinus baumii Pilat. The method comprises the following steps: (1) inoculating the purified strain separated from a Phellinus baumii Pilat fruiting body to a mother seed culture medium so as to obtain a mother seed; (2) inoculating the mother seed to an original seed culture medium so as to obtain a Phellinus baumii Pilat original seed; (3) inoculating the Phellinus baumii Pilat original seed to a cultivar culture medium inside a cultivation bag for culture; and (4) transplanting the cultivation bag fully covered by hypha into a mushroom producing room and carrying out the mushroom producing culture under the following conditions: 85 to 95 percent of relative air humidity and 22 to 25 DEG C of temperature. The method finds out the best environmental factors such as the relative air humidity, the temperature, the illumination, and the like for the growth of the Phellinus baumii Pilat fruiting body. Through the artificial accurate control on the factors of relative humidity and temperature in the mushroom producing room, the method can maximally improve the growth speed of the Phellinus baumii Pilat fruiting body while simultaneously ensuring the quality of the Phellinus baumii Pilat fruiting body. The method has the advantages of high yield, high Phellinus baumii Pilat fruiting body quality, material conservation, short production cycle, and the like.

The invention discloses a goat forage and a preparation method thereof. The goat forage is composed of the following raw materials, by weight, 50-60 parts of sorghum straw powder, 25-30 parts of Chenopodium album Linn. powder, 20-30 parts of pine leaf, 10-15 parts of Lolium perenne L., 15-20 parts of bagasse, 8-12 parts of Herba Taraxaci, 15-25 parts of soybean meal, 1-2 parts of a starter, 40-50 parts of corncob, 15-25 parts of rice bran, 10-15 parts of sunflower receptacle, 4-6 parts of a lyophilized powder additive, 3-5 parts of shell powder, 5-10 parts of zeolite powder, 3-5 parts of soybean oil, 2-4 parts of sodium alginate, 0.5-0.8 parts of calcium hydrogen phosphate, 0.01-0.02 parts of potassium iodate and 0.3-0.5 parts of salt. The forage contains all nutrition required by the growth of goats, guarantees the healthy production of the goats, provides healthcare values, and raises the growth speeds of the goats.

The invention provides a litchi grafting method, which comprises the following steps of scion and stock selection, grafting preparation, grafting and post-grafting management. Seedling litchi seedlings have arbor wood roots, the root systems are developed, and the grafting survival rate is ensured through selecting the seedling litchi seedlings as stocks; the seedling litchi seedlings and high-quality litchi seedlings belong to one family, the affinity between scions and stocks is high, the grafting success rate is greatly improved, and the growth speed of the grafted seedlings after the grafting can also be accelerated; the litchi seedlings have higher drought resistance capability, and the grafting survival rate can be ensured under the drought conditions, so the grafted litchi seedlings can bloom and bear fruit in three years. The litchi grafting method has the advantages that simplicity and convenience are realized, the survival rate is high, the coverage rate of high-quality litchi varieties can be improved, and the advanced blooming and fruiting of litchi can be realized.

The invention discloses a liquid submerged fermentation culture method for hericium erinaceus, and belongs to the field of culture methods for edible fungi. The culture method comprises the following steps of: activating hericium erinaceus strains on a slant culture medium, then performing primary strain culture on a liquid seed culture medium, performing secondary strain culture on a liquid fermentation culture medium, and finally performing amplified culture on the liquid fermentation culture medium to obtain hericium erinaceus mycelium. The invention also discloses hedgehog hydnum 1 in the hericium erinaceus strains, a seed culture medium and a fermentation culture medium for hericium erinaceus culture. The biological yield of the hericium erinaceus mycelium obtained by the culture method is high and can reach 12g / L which is over two times as much as the fermentation production level of the current factory; the hedgehog hydnum 1 in the hericium erinaceus strains has high growth speed which can reach 5.8 millimeters every day; and moreover, the liquid seed culture medium and the fermentation culture medium have good culture effect so that the hericium erinaceus mycelium has quick growth and high yield.

The invention discloses a novel strain CLIMAX-VSF of streptomyces fradiae. The preservation number of the novel strain is CGMCC No. 5133; the preservation date is August 12, 2011; and the preservation department is China General Microbiological Culture Collection Center. The invention further discloses a microbial inoculum containing the novel strain. The novel strain CLIMAX-VSF of the streptomyces fradiae, which is provided by the invention, has quite obvious performances of disease resistance, nitrogen fixation, phosphate solubilization and somatotropin secretion. By using the strain, the germination rate and the growth speed in a seedling stage can be obviously improved under the condition that nutrients are not added to soil, and furthermore, diseases in the seedling stage and a growth period are obviously inhibited. On the aspect that the strain is used for the mixed preparation and the synergy of a fertilizer, the strain shows to have the favorable effect of activating soil nutrients and the performance of resisting a plurality of cultivation obstacles.

The invention discloses a method for culturing pleurotus eryngii. The method comprises the following steps of: selecting saw powder of alfalfa growing in organic soil, wild nuts in mountain and wild trees in mountain, mixing, fermenting, sterilizing, and inoculating the sterilized fermentation product to pleurotus eryngii hypha to culture to obtain mature pleurotus eryngii. By adopting the alfalfa growing in the organic soil, the problem that the alfalfa growing in common soil contains chemical fertilizer, pesticide residue and the like is solved, and harm of chemicals to a human body is solved; meanwhile, because the alfalfa is selected as one of the culture medium materials for culturing the pleurotus eryngii, the germination rate of the pleurotus eryngii can be increased by using the alfalfa to culture the pleurotus eryngii; and because the alfalfa is used as one of the culture medium materials, the growth speed of hypha can be increased, so that the production efficiency of the pleurotus eryngii is increased, and the economic benefit of the pleurotus eryngii is increased. The method has the advantages of achieving the best sterilization effect, saving the sterilization time, being simple and easy in material selection, saving a large amount of labor, reducing the production cost and increasing the economic benefit.

The invention provides an efficient pig-feed complex enzyme preparation with enzyme protectant. The efficient pig-feed complex enzyme preparation with enzyme protectant is capable of promoting absorption of nutrients in the feed by pigs to increase feed utilization rate by degrading antinutritional factors, such as beta-glucan, phytic acid and pectin, biomacromolecules and the like. By adding the protectant, inactivity rate in enzymes can be reduced, effective time can be prolonged, and the effects of the enzyme preparation are more evident and longer. The efficient pig-feed complex enzyme preparation with enzyme protectant is high in feed conversion rate, feed-to-grain ratio can be lowered by more than 19%, growth speed of pigs is increased by more than 23%, and enzyme activity is kept in 18 months and can be kept by more than 90%.

The invention relates to a method of earthworm cultivation through cow dung straw compost. Cow dung and straws are used as raw materials, the mixed materials of the cow dung and the straws are evenly mixed with mixed zymophyte liquid and then are watered and fermented until the temperature reaches 60 DEG C to 70 DEG C, and then fermentation is carried out for at least 3-5 days at the temperature. When the temperature goes down to 25 DEG C to 30 DEG C, earthworms are put into the fermentation materials, and according to consumption speed of nutriment in the cultivation process, fermentation products are added, a certain amount of earthworm cast is taken out, and the earthworms can be collected and harvested after maturing. The method can obviously improve growth speed and egg laying amount of the earthworms, and yield of the earthworms is improved.

The invention relates to concentrated feed for mutton sheep and a preparation method thereof. The concentrated feed for mutton sheep is prepared by mixing bean pulp, cottonseed meal, seasame cakes, DDGS (Distillers Dried Grains with Soluble), corn germ meal, molasses, mountain flour, calcium hydrophosphate, salt, sodium bicarbonate, feeding microbial ecological agent, special premix for mutton sheep, rumen bypass fat and by-pass lysine. Through strictly-selected raw materials and reasonable formula, the invention has the advantages of balance and all-around nutrition, strong pertinency, excellent palatability and high digestibility, and obviously increases the growth speed of the mutton sheep in comparison with the same kinds of self-prepared products. Meanwhile, by adopting international advanced Buhler production equipment, the invention reserves the nutrition substances to the maximum limitation without being destroyed by high temperature and can kill bacteria in the feed raw materials at the same time.

The invention relates to feed, in particular to feed for lean meat fattening pigs. The feed consists of a major material part and an auxiliary material part, wherein the mass content of the major material part is 98 percent, the mass content of the auxiliary material part is 2 percent, the major material part consists of the following ingredients in parts by weight: 300 to 500 parts of corn, 200 to 300 parts of wheat, 150 to 200 parts of dehulled soybean meal, 0 to 100 parts of American distillers dried grains with solubleb (DDGS), 0 to 50 parts of rice bran, 30 to 100 parts of wheat bran, 6 to 10 parts of mountain flour and 5 to 10 parts of calcium hydrophosphate, the auxiliary material part consists of the following ingredients in percentage by weight: 2 to 5 percent of choline, 1 percent of antioxidant, 3 percent of mould inhibitors, 2 percent of composite vitamins, 15 to 30 percent of synthetic amino acid, 20 to 30 percent of electrolyte, 15 percent of composite trace elements, 0.5 percent of phytase, 1 percent of composite zymin, 3 to 10 percent of meat modifiers and 5 to 30 percent of carriers. The feed for the lean meat fattening pigs provided by the invention has the advantages that 1) the growth speed and the lean meat percentage of the lean meat fattening pigs can be improved; 2) the pork quality can be improved, and in addition, no toxic residue exists; and 3) the heath of consumers is ensured, and the competitiveness of the pig product exportation is enhanced.

The present invention is bache demer pruning feed and its preparation process. The bache demer pruning feed is prepared with defatted fish meal 4-8 wt%, high gluten flour 12-16 wt%, brewer's yeast 6-10 wt%, algae powder 30-71 wt%, composite vitamins 0.3-0.7 wt% and composite trace elements 0.3-0.7 wt%, where, the algae powder may be replaced with degummed kelp powder 26-30 wt% or sea mud 5-7 wt%. In addition, micro ecological preparation in 0.5 wt% or zeolite powder in 2-4 wt% may be added for good intestinal tract condition of and breeding water environment for bache demer. The bache demer feeding practice shows that the bache demer pruning feed can increase the growth speed of bache demer greatly.

The invention provides a method for cultivating lucid ganoderma, relating to a method for cultivating edible fungi, in particle to a method for cultivating the lucid ganoderma with new cultivating material. The cultivating material in the method contains eucalyptus, wherein the cultivating material is preferably contains eucalyptus bark or eucalyptus branch or mixture of the eucalyptus bark and the eucalyptus branch. The method selects the eucalyptus as the cultivating material, wherein the eucalyptus is not usually regarded as to be suitable for cultivating the lucid ganoderma, to obtain lucid ganoderma seed entities with faster growth speed, wherein the seed entities almost have the same effective constituent of the lucid ganoderma. Furthermore, the eucalyptus has fast growth, short circulation period and high yield, therefore, the price is lower than the other broad-leaved trees. Because the other constituents such as cotton seed hulls, bagasse, and the like, are not needed to be added, comparatively speaking, the method has lower price.

The invention provides bacillus subtilis LFB112 with the collection number of CGMCC No.2996. The bacterial strain has relatively high antibacterial activity and has antibacterial effect on various animal pathogenic bacteria and food pathogenic bacteria. The invention also provides bacteriocin produced by the bacterial strain, wherein the bacteriocin is relatively stable against heat and acid and has a broad-spectrum antibacterial effect without inhibiting beneficial bacteria. Experiments indicate that the bacterial strain LFB112 provided by the invention and the bacteriocin produced by the same can be used for improving the clinical symptoms of chicken and increasing the growth speed and feed price, and can be used in biological veterinary medicaments or feed additives.

The invention discloses a rhizoma bletillae industrialized seedling method. According to the method, the advantage of large quantity of rhizoma bletillae capsule seeds is fully utilized; with the seeds as an explant, a rhizoma bletillae tissue culture rapid breeding technology and a tissue culture seedling domestication technology are established; germination and growth are carried out under an aseptic condition, so that the influence on external environment and germination of rhizoma bletillae seeds is overcome, and the germination rate and the growth speed of the rhizoma bletillae seeds are greatly increased. By only needing 5 months, the seeds can grow into plants of which the corm diameter is about 0.7cm, and only one-time grafting is needed in the process, so that the industrialized production of the rhizoma bletillae seeds is realized; moreover, the method is easy to operate, low in cost and high in reliability; the whole seedling period is about 8 months, and the domestication survival rate is 91 percent or above; the rhizoma bletillae seedlings which are domesticated for about 3 months are directly transplanted into a field so that the survival rate is up to about 98 percent and the rhizoma bletillae can be harvested after 4-5 years. The problem that the rhizoma bletillae seedlings are difficult to breed is solved, and the industrialized seedling of the rhizoma bletillae is realized.

The present invention provides a semiconductor device, which comprises a first semiconductor layer of the first conductivity type having a plurality of trenches formed therein. A second semiconductor layer of the second conductivity type composed of an epitaxial layer is buried in the trenches in the first semiconductor layer. The trench has surface orientations including a surface orientation of a sidewall at an upper stage made slower in epitaxial growth speed than a surface orientation of a sidewall at a lower stage.

The invention belongs to the field of feeds, relates to an aquiculture feed and particularly relates to a penaeus vannamei compound feed special for high salinity (over 3%) cultivation and a preparation method of the compound feed. The penaeus vannamei compound feed contains 3-6 parts of euphausiid meal, 20-35 parts of fish meal, 2-4 parts of fly maggot meal, 3-7 parts of chicken meal, 1-5 parts of silkworm chrysalis meal, 2-6 parts of squid liver paste, 2-5 parts of shrimp shell meal, 1-3 parts of algae powder, 3-8 parts of fermented soybean meal, 3-13 parts of soybean meal, 3-8 parts of peanut meal, 2-7 parts of corn gluten meal, 10-20 parts of wheat flour, 4-10 parts of monosaccharide and / or oligosaccharide, 2-6 parts of sleeve fish liver meal, 2-4 parts of fish oil, 1-2 parts of soybean oil, 1-3 parts of soybean phospholipid powder, 0.1-0.4 part of choline chloride and 1-3 parts of monocalcium phosphate. The penaeus vannamei compound feed is capable of meeting the growth requirement of penaeus vannamei for nutrition under high salinity (over 3%), good in stability in water, strong in anti-stress capability, high in survival rate and growth speed and low in feed coefficient.

Halftone cells each serving as a unit for formation of a dot are arranged in irregular shapes at random and divided into two groups. The halftone cells (720) in the first group are fewer than the halftone cells (730) in the second group and dispersed, and the area of each of the halftone cells (720) in the first group is set larger than that in the second group. The dot growth speed of the halftone cells (720) in the first group is higher than that of the halftone cells (730) in the second group. This allows formation of fine halftone dots consisting of the halftone cells in the first and second groups, and it is possible to reduce banding appearing in a main scan direction during recording of the halftone dots, with low-frequency components in spatial frequency of the halftone dots caused by the halftone cells (720) in the first group.