44results about How to "Reduce fruit drop rate" patented technology

The invention discloses a plant growth regulator composite containing diethyl aminoethyl hexanoate and cycogan, which is characterized in that the plant growth regulator is liquid, powder or granula prepared by taking diethyl aminoethyl hexanoate (hexanoic acid 2-(diethylamino) ethyl ester) or salts thereof and the cycogan and adding with carriers or solvent, stabilizer and surfactant. The invention has the advantages of novel design, good effect in increasing yield for various crops and obviously-improved product quality, can effectively enhance stress resistance (such as lodging resistance, disease resistance, drought resistance, cold resistance, heat resistance, chemical injure resistance and the like), and has simple production technology, simple and convenient use and vast popularization and application prospect.

Disclosed is a self-propelled double row carrot combine harvester. The self-propelled double row carrot combine harvester is composed of a lifting grain guiding device, an excavating device, a slant clamping conveying device, a soil removing device, an alignment vine cutting device, a horizontal belt conveying device, a lifting fruit collection device, a crawler chassis, a power transmission system, a hydraulic system and the like, wherein the excavating device, the lifting grain guiding device, a depth wheel, the slant clamping conveying device, the soil removing device and the alignment vine cutting device are installed on a front machine frame, the front machine frame is installed at the front end of one side of a power output shaft of the crawler chassis, the horizontal belt conveying device and the lifting fruit collection device are installed on a rear machine frame, and the rear machine frame is fixed on the crawler chassis at the rear end of the front machine frame. The self-propelled double row carrot combine harvester can simultaneously complete excavating, clamping conveying, stem and leaf separation, oil removing and harvesting operation of two rows of carrots, facilitates improvement of the mechanization level of the carrot harvesting operation, and improves operation efficiency.

The invention discloses a simple, water-saving and efficient peanut cultivation method, comprising the following steps: (1) carefully choosing good seeds; (2) adopting a suitable degradable mulching film that can reduce residual mulching films during plant harvesting and is beneficial for mechanical picking and plant recycling; (3) mechanically applying a granular peanut special fertilizer; (4) adopting an under film drip irrigation technology to reasonably save water through "fertilizer regulation with water"; (5) performing mechanized sowing and drip irrigation management; (6) strengthening disease and insect control and reasonable chemical control; (7) determining peanut plants suitable for harvesting; and (8) determining a harvest time and performing mechanical harvesting. The peanut cultivation method disclosed by the invention achieves the following beneficial effects: the harvesting cost is reduced by 70% or higher compared with that of manual harvesting, and is reduced by 20% compared with that of other planting methods adopting machine harvesting; the fruit drop rate is reduced by 50% or higher compared with that of other planting methods adopting machine harvesting; and the labor productivity is improved, the irrigation frequency and strength are reduced, the fertilizer utilization ratio and the plant utilization ratio are improved, and the peanut plump percent and the peanut acre yield are improved.

The invention relates to the field of technological agricultural planting, in particular to a planting method for Taiwan morus macroura. The method includes the following steps of land selecting and preparing, wherein the land which has a thick soil layer and is convenient to drain and irrigate is selected, and planting holes are prepared; planting, wherein healthy Taiwan morus macroura saplings are selected and planted; laying an irrigation system, wherein after the morus macroura saplings survive, the water and fertilizer integrated irrigation system is laid in the morus macroura planting land; field management; harvesting, wherein morus macroura is harvested after being matured, and old branches are pruned after each time of harvesting. The planting method for Taiwan morus macroura is provided, the problem that morus macroura fruits are prone to falling off in the planting process of the Taiwan morus macroura can be effectively solved, and economic benefits of planting are increased.

The invention provides a grape preservation method which comprises the following steps: S1, pre-cooling grapes at -2 to 0 DEG C, and performing sealed fumigating treatment by adopting 1-MCP during pre-cooling; S2, performing short wave ultraviolet irradiation treatment on the grapes at -2 to 0 DEG C; S3, performing ozone fumigating treatment on the grapes at -2 to 0 DEG C; and S4, after the ozonefumigating treatment, when the environmental ozone concentration decreases to 0mg / L, packaging the grapes with bags, putting preservatives into the bags, and performing controlled atmosphere storage at -2 to 0 DEG C. The grape preservation method is capable of effectively prolonging the preservation period of the grapes and reducing fruit stem browning and fruit drop rate.

The invention provides straw fermented fine organic fertilizer and a preparation method of the straw fermented fine organic fertilizer. The straw fermented fine organic fertilizer is prepared by mixing a straw fermented material, soybean cakes, ammonium sulfate, calcium magnesium phosphate fertilizer, manganese sulfate, boric acid, zinc sulfate, ferrous sulfate, a conditioning agent, ammonium molybdate and copper sulfate according to a certain ratio. According to fertilizer demanding characteristics of crops at different growth periods, the organic fertilizer provides fertilizer efficiency persistence for the crops and three demanded elements including nitrogen, phosphorus and potassium and a plurality of medium and trace elements for the crops; soil is improved by utilizing good microorganisms in a farm-oriented microorganism bacterium agent material fermented by corn straw, soil acidification is reduced, the soil fertility is increased and the utilization rate of the fertilizer is improved; advantages of the two types of fertilizer are combined; meanwhile, calcium and magnesium and other medium and trace elements, which are needed by melon and fruit crops, are added, so that physiological diseases caused by later-period element deficiency of melons and fruits are effectively solved.

The invention provides a zizyphus maurtiana planting method and relates to the field of planting of zizyphus maurtiana. The zizyphus maurtiana planting method comprises the steps of field planting and water-fertilizer management, and further comprises the following step: spraying a certain amount of a microbicide in each growth period of zizyphus maurtiana. The microbicide comprises the following components: a bacillus subtilis agent, a trichoderma harzianum agent, a photosynthetic bacterium agent, a yeast agent, a bacillus thuringiensis agent and an enzyme enhancer preparation, wherein the enzyme enhancer preparation comprises such components as chitinase, glucanase and protease. By adoption of the zizyphus maurtiana planting method provided by the invention, the occurrence and spread of diseases and insect pests can be effectively controlled, the number of fruits with disease spots and the fruit dropping rate can be reduced; the quality and the yield of the zizyphus maurtiana can be improved; and the pollution-free planting effect can be achieved.

The invention discloses a method for integrated control of citrus fruit flies and belongs to fruit insect attack prevention methods. The citrus fruit fly control method is low in labor cost and can turn waste into wealth. According to the method, biological killing and physical cutting off of the insect source are combined; biological killing comprises the step of spraying a food trapping agent in the middle emergence period before massive coupling and oviposition, one third of plants in an orchard are sprayed with the food trapping agent, one third of the total area of each plant is sprayed with the food trapping agent, and spraying is conducted five times continuously; the food trapping agent is prepared from, by weight, 5% of Chinese rice wine, 5% of protolysate, 5% of vinegar and 85% of 90% crystal trichlorphon 500 times liquid; physical cutting off of the insect source comprises the steps of picking, maggoty fruit picking, and sinking into a biogas digester for insect killing. By the adoption of the method for integrated control of citrus fruit flies, the fruit-drop rate is reduced to 15% or less from the original 85% or more, and the control effect is quite remarkable.

The invention provides an organic fertilizer and a natural shade composting method thereof. The composting method comprises the following steps of: adding curing solution prepared from plant extracts into composting raw materials containing a mother fertilizer; and performing low-temperature aerobic fermentation on the plant extracts to prepare an organic fertilizer, wherein the plant extracts are prepared by performing extraction, concentration, fermentation and antagonism treatment on a plurality of plants; the curing solution is prepared by blending the plant extracts and basic water; the mother fertilizer is obtained by spraying the fertilizer curing solution onto the excrements, serving as the raw materials, of pigs and yarding and turning the excrements up and down; and the pigs are fed by an environmentally-friendly dry odorless pig-keeping method. The natural shade composting method has the advantages of realizing odorless, zero-emission and pollution-free composting, saving the cost, improving the production efficiency, solving problems on the harmless treatment of agricultural wastes and livestock manure and improving the quality of the organic fertilizer. The organic fertilizer prepared by the method has the advantages of no odor, deodorization function, no secondary fermentation, stable quality, high organic matter content, high fertilizer efficiency, low heavy metal content, high germination percentage and the like.

The invention relates to the technical field of planting, in particular to a rhodomyrtus tomentosa planting method. The method mainly comprises the following steps that (a) seed screening is performed, wherein high-quality rhodomyrtus tomentosa seeds are screened and dried and then are stored; (b) the seeds are processed, wherein the seeds are put in a saline solution for screening, and seeds obtained after soaking are uniformly mixed with silt; (c) transplanted seedlings are cultivated, wherein the seeds are scattered onto nutrient soil on a compartment face, a layer of straw is laid, and watering is performed to obtain the transplanted seedlings; (d) transplantation and planting are performed, wherein planting holes are formed, quick lime and planting base fertilizers are scattered in the planting holes, soil is backfilled, the transplanted seedlings are taken for transplantation, earthing is performed, a leaf fertilizer is sprayed on time within 2 months after transplantation, non-survived transplanted seedlings are supplemented in time to obtain survived transplanted seedlings; (e) field management is performed, wherein main seedlings are removed to promote side branch growth,and a pollination agent is sprayed in a flowering phase; (f) fruits are harvested. By adopting the method, the survival rate of planted rhodomyrtus tomentosa can be remarkably improved, the quality ofrhodomyrtus tomentosa fruits can be improved, the yield per unit area can be increased, and the economic benefit of planting is increased. The method is suitable for large-scale planting.

The invention discloses an agent for improving the fruit setting rate and yield of macadamia nuts and a preparation and use method. The agent for improving the fruit setting rate and yield of macadamia nuts is prepared from a first agent, a second agent and a third agent, the first agent is characterized by being prepared from zeatin, gibberellin, alpha-naphthylacetic acid, compound sodium nitrophenolate, soya bean lecithin, sunflower lecithin, borax, monopotassium phosphate, sodium humate and microelement fertilizer, wherein the first agent is used for improving the fruit setting rate of macadamia nuts; the second medicament is characterized by reducing the fruit dropping rate of macadamia nuts and is prepared from brassinolide, 6-benayl aminopurine and sodium citrate; the third agent is an organic chelated sugar alcohol calcium leaf fertilizer and is characterized by reducing the cracking rate of macadamia nuts; under the synergistic effect of the first agent, the second agent and the third agent, the fruit setting rate of the macadamia nuts can be increased, the fruit dropping rate and the fruit cracking rate are reduced, and the yield of the macadamia nuts is increased.

The invention relates to a citrus tree retaining preservative containing amino-oligosaccharin and cinnamic acid. The citrus tree retaining preservative is prepared from, by weight, 2-5% of amino-oligosaccharin, 1-3% of tea polyphenol and 1-3% of cinnamic acid, and the weight ratio of amino-oligosaccharin to tea polyphenol to cinnamic acid is (2-5):(1-3):(1-3). The fruit drop rate of citruses during tree retaining can be obviously reduced, and adverse influences of decrease of the next-year fruit setting rate caused by tree retaining preservation can be relieved.

The invention discloses a fruit tree shedding resistant agent. The fruit tree shedding resistant agent comprises the following substances: 100-200g of boric acid, 10-60g of urea, 50-80g of calcium superphosphate, 100-200g of potassium permanganate, 80-160g of potassium dihydrogen phosphate, 5-8g of cycocel, 10-30g of sodium bisulfite and 30-50L of water. Compared with fruit tree shedding resistant agents prepared with the prior art, the fruit tree shedding resistant agent of the invention has the following beneficial effects: 1, the fruit tree shedding resistant agent which allows the fruit tree boll shedding rate to be reduced by 20-30% has the effects of disinfection and sterilization; 2, the fruit tree shedding resistant agent has adjustment and growth promotion effects on fruit trees; and 3, the fruit tree shedding resistant agent can provide nutrient elements for the fruit tree growth.

The invention discloses a method for controlling pomegranate tree rootstock budding. The method includes: coating inhibitor at a cut or on the periphery near the cut of a cut pomegranate tree, and using black films to wrap a rootstock of the pomegranate tree to avoid direct sunlight so as to reduce photosynthesis. By the method, pomegranate tree rootstock budding is reduced effectively, yield of the pomegranate tree is increased, and fruit drop rate of the pomegranate tree is lowered.

The invention provides an orange pedicel drop resisting preparation which is prepared from the following ingredients in parts by weight: one part of 2-methyl-4-chlorophenoxyacetic acid or 2-methyl-4-sodium chlorophenoxyacete or 2-methyl-4-amine chlorophenoxyacete, 10-20 parts of glycerinum and 40-50 parts of polyoxyethylene-8-octyl phenyl ether-100 (triton X-100). The orange pedicel drop resisting preparation is used for preventing drop of orange fruits before harvesting, and fruit drop before harvesting can be reduced by 64.1-87.4 percent. The preparation has a good effect of preventing pedicel drop of stored orange fruits and can be used for reducing the pedicel drop of the stored fruits by 94-100 percent.

The invention discloses an anti-winding pick-up device and a harvester. The anti-winding pick-up device comprises a motor end baffle welding part, a pick-up roller welding part and a bearing end baffle welding part. The motor end baffle welding piece is installed at the motor end and comprises a right side baffle disc, the two ends of the picking roller welding piece comprise picking end plates, the bearing end baffle welding piece is installed at the bearing end, and the bearing end baffle welding piece comprises a left side baffle disc. The right side baffle disc and the left side baffle disc are respectively connected with the picking end plates at the two ends of the picking roller welding piece, and the picking end plates, the left side baffle disc and the right side baffle disc form a double-sealing structure; the device can reduce dust, soil, weeds and the like entering the picking roller, has an anti-winding function, and is good in anti-winding effect, simple in structure and easy to clean; according to the harvester, picked, distributed and cut sugarcanes can smoothly enter a next-stage conveying channel in the sugarcane receiving process, the falling rate and the loss rate of the sugarcanes in the picking process are reduced, and the harvesting efficiency is high.

The invention relates to the technical field of okra planting and discloses a high-yield okra planting method. The method has the advantages that survived okra seedlings are transplanted into nutrient soil which contains additionally-added mixed mineral substances having great influence on the constitutive property, exchange capacity and fertility effect of soil, calcium has good positive correlation with a pH value, the soil acid-base balance effect of thoroughly decomposed chicken manure compound fermentation fertilizer can be kept, silicon has a strong adsorption effect on important base ions on soil colloid, formation of humus and conversion of nutrient elements can be controlled and the problems of soil aggregation and soil structure degeneration can be avoided due to the combination of components, home-made slow release fertilizer is used for prompting the growth of okra plants, fine management is performed during flowering and fruiting periods, and thus a fruit drop rate is reduced, and the quantity of bearing branches is increased.

The invention belongs to the technical field of fertilizers, and discloses a biomass compound fertilizer capable of increasing the yield of amomum villosum, wherein the biomass compound fertilizer comprises the following components in percentage by mass: 8-15% of a seaweed extract material, 50-70% of an organic chelating material, and 20-35% of an inorganic composite material. By mixing the organic fertilizer and the inorganic fertilizer, the growth traits of the amomum villosum plants can be remarkably improved, the stem diameter can be increased, the fruiting rate of the single amomum villosum plant can be remarkably increased, the quality of single fruit can be remarkably improved, and meanwhile, the fruit drop rate of the amomum villosum is remarkably reduced, so that the aims of increasing the yield and reducing the planting cost are achieved.

The invention discloses a method for planting pineapples by using an organic formula fertilizer, and belongs to the technical field of agricultural planting. The organic formula fertilizer comprises the following raw material components by dry weight: 25-30 parts of astragalus sinicus straws, 10-20 parts of chicken manure, 10-15 parts of mushroom stick waste residues, 15-20 parts of waste plant herbal residues, 12-16 parts of soybean meal, 3-6 parts of a complex microbial inoculant, 15-20 parts of humic acid, 4-8 parts of compound amino acid and 4-8 parts of a water-retaining agent. The organic formula fertilizer is prepared according to the steps of raw material treatment, material composting fermentation, adding of residual raw materials, uniform mixing and fertilizer granulation. The organic formula fertilizer is balanced in nutrient, strong in soil fertility and strong in water retention capacity, meets the growth and development requirements of the pineapples, can effectively promote the growth of the pineapples and improve the yield and quality of the pineapples when being used for planting the pineapples, and can effectively prevent the pineapples from cracking and further improve the quality of the pineapples by using an anti-cracking regulator in the planting process.

The invention relates to an orange on-tree fresh keeping agent containing methyl jasmonate and prochloraz. Effective components of the orange on-tree fresh keeping agent comprise methyl jasmonate and prochloraz, and a weight ratio of the methyl jasmonate to the prochloraz is (5-20):1. The orange on-tree fresh keeping agent has the advantages of synergism, improvement of the stress resistance of oranges, reduction of sooty mold and gray mold in the on-tree fresh keeping stage, and effective reduction of the fruit dropping rate in the orange on-tree fresh keeping stage.

The invention discloses a comprehensive prevention and treatment method for honey pomelo scabs. The comprehensive prevention and treatment method comprises the steps of fruit tree treatment, soil texture adjustment, physical prevention and treatment, and pesticide prevention and treatment. According to the method, a trunk is warped upwards, a distance is remained, ventilation and light transmission are convenient, fruit thinning enables honey pomelos to grow more fully, the fruit drop rate is reduced, and breathable transparent film bag are matched to avoid contact propagation of diseases andpests; a drainage channel and a reflective mulching film are matched with physical prevention and treatment of terrains, so that orchards can be kept dry and the bottoms of fruit trees can be lighted,fungus propagation infection in a humid environment is prevented, scab morbidity is reduced, and weeding and soil loosening are carried out to loosen and ventilate soil; deeply-buried organic fertilizer, ground surface inorganic fertilizer, a low-toxicity bactericide, an antibacterial agent mixed material, brassin and micro element fertilizer are matched, soil fertility is improved, ground is dried, bacterial and fungal viruses in the orchards are effectively killed, the resistance of the fruit trees is improved, the yield is stably increased, the scab morbidity is reduced to the minimum in cooperation with pesticide prevention and treatment, and at the same time, the scabs can be prevented from further spreading to stop loss in time.

The invention belongs to the technical field of white pomelo planting, and discloses a white pomelo high-yield method. The method comprises the following steps: the self-flowering and non-fruiting mechanism of Dianjiang white pomelo is tested; a pollination yield increasing technology of girdling, flower promoting agent, artificial cross pollination and nutritional fruit retention is provided; the winter fruit falling and granulating mechanism of Dianjiang late pomelo is ascertained, the winter anti-falling and anti-granulating comprehensive technology of Dianjiang late pomelo with balanced fertilization, hormone fruit retention, flood drainage and film mulching and planting in proper land is formed, and a 3 + 2 + organic + medium-micro nutrition diagnosis formula fertilization technology is provided; simple pruning technologies of low-yield tree rotation fruiting, branch break without tree break, old tree crown retraction, root cutting and updating, upper opening, lower hanging branch beating, peripheral thinning and dense and crossed removal, and inner withered branch pruning of production trees are adopted; a green mite prevention and control technology of tree trunk whitening, predatory mites, vegetable oil and matrine for mites is established. According to the method, a high-quality and high-yield technical system of characteristic Dianjiang white pomelo is formed, and scientific and effective technical support is continuously provided for healthy development of the industry.

The invention relates to an edible refreshing plastic capable of reducing fruit dropping rate. The plastic is composed of zein, mannose fatty acid ester, inositol hexaphosphoric acid, aminoacetic acid, tween-80 and water, and is prepared by the steps of: taking zein as the basic material, mixing zein with mannose fatty acid ester according to ingredient ratio to emulsify and dissolve the zein, adding inositol hexaphosphoric acid, aminoacetic acid, tween-80 and water according to ingredient ratio, heating the mixture, stirring uniformly, and removing the foams generating during the stirring process to obtain the final product. The edible refreshing plastic can reduce fruit dropping rate consumedly, and all the ingredients are edible which have no toxic pollution to the fruit.

The invention belongs to the field of fertilizers and specifically relates to a special fertilizer for apples. The fertilizer for apples is composed of the following raw materials by weight percent: 26.9-38.7% of ammonium-containing compound, 25.0-30.0% of potassium-containing compound, 32.6% of diammonium hydrogen phosphate and 3.7-7.8% of additives, wherein ammonium nitrate or ammonium chloride is taken as the ammonium-containing compound and potassium chloride or potassium sulfate is taken as the potassium-containing compound. The special fertilizer for apples has the beneficial effects that the weight of a single apple can be increased by 75g, the apple peel is red, the apple stem is thickened and the apple drop rate is obviously reduced.

The invention provides a composition for increasing fruiter fruit setting rate and relates to the technical field of plant regulators. The composition comprises, by weight, 1-5 parts of diethyl aminoethyl hexanoate and 0.2-0.5 part of gibberellin. By spraying a preparation comprising the composition onto fruiters, fruit dropping rate of pear can be lowered from higher than 5% to about 1% while that of peach can be lowered from about 15% to about 10%, fruit dropping rate of plum can be lowered from 40% to 20% while that of two-ovary plum among the plum is lowered from 99% to 90%, so that fruitdropping rate of the fruiters is lowered remarkably, and fruit setting rate of various fruiters is increased.

The invention relates to a cultivation method of xiang bitter oranges. The method comprises the following steps of fruit storage and seed preservation, shell opening and seed warming, sowing and seedling hardening and transplantation and forest establishment. According to the cultivation method, the measures are adjusted according to the local conditions, according to the geographical characteristics of the Hunan area, research of the seedling cultivation stage of the bitter oranges is emphasized, through sterilization, waxing and low-temperature fine sand storage, fresh fruits cannot go bad,a natural storage environment is established for the seeds, and the germination rate of later sowing is above 95%. Meanwhile, by adopting combination of hole sowing and classification seedling hardening, seedlings are robust and grow robustly in the later period, and the survival rate of transplantation and field planting basically reaches 100%. The age of fruit bearing trees of the bitter orangescultivated by the method can be younger by 1-2 years, the fruit drop rate is reduced by 30% or above, few diseases and pests exist, and compared with bitter oranges cultivated by the prior art, the method has the advantage that the content of the effective components of the cultivated bitter oranges is increased by 1-2%.

The invention discloses a portable environment-friendly citrus fruit fly control method which includes the steps of citrus fruit fly larvae bag sealing and killing in a fruit drop period, citrus orchard edge centralized adult trapping and killing in a return mating season and full orchard avoiding fruit retention in a spawning period. According to special life habits of citrus fruit flies, green pesticides and instruments are scientifically used for controlling the citrus fruit flies in periods and areas with the most concentrated orange citrus fruit flies. Processes are simplified, control efficiency is improved, pesticide and labor costs are reduced, safety of fruits is improved, and environmental pollution is relieved.

The invention relates to a plant source nutrient solution preparation method using walnut male inflorescences as a raw material. The method comprises the following steps: extracting the nutrients of male inflorescences with sugar used as the extractant, then diluting and spraying the solution back to the leaf surface of walnut. The method is adopted to supplement the nutrients of the walnut tree,reduce the fruit drop rate of walnut and increase the yield. The method makes full use of a lot of redundant and immature male inflorescences of walnut as the raw material to prepare the plant sourcenutrient solution, thus the nutrients are rich and the nutrients which may be lost can be supplemented back to walnut. Therefore, waste materials can be utilized and the environment can not be polluted. The method is simple, easy to learn, environmentally-friendly and practical and is an effective method for producing the green food (walnut); and the invention provides a method of utilizing the waste materials to provide the nutrients so as to increase the yield of walnut. The invention lays a foundation for applying fertilizers for the leaf surface in the production of pollution-free walnuts, green walnuts and organic walnuts.

The invention provides application of 2, 4-D sodium salt in prevention of waxberry abscission. The 2, 4-D sodium salt enables thickening of waxberry carpopodium to make waxberry fruits less prone to abscission, and accordingly the waxberry abscission rate is decreased. The waxberry abscission rate is 13.4-28.6% when the 2, 4-D sodium salt is applied while the waxberry abscission rate is 34.0% when no agent is applied; thus the waxberry abscission rate is decreased by 5.4-20.6% by the 2, 4-D sodium salt, the 2, 4-D sodium salt cannot cause chronic diet exposure risks to children and adults.

The invention discloses a drip irrigation fertilizer for promoting the increase of the oil content of oil-tea camellia fruits. The fertilizer comprises 10.35 wt% of urea, 38.09 wt% of diammonium phosphate, 51.18 wt% of potassium sulfate, 0.05 wt% of sodium tetraborate, 0.19 wt% of zinc sulfate and 0.05 wt% of magnesium sulfate. The drip irrigation fertilizer can solves the problems of low oil content, low fruit cracking rate and low seed yield of fruits in the key period of oil conversion of the oil-tea camellia fruits, and can effectively promote the increase of the oil content of oil-tea camellia fruits and promote the development of oil-tea camellia fruits in order to effectively increase the oil content of fruits.