JK-TK/GRADE-8-TERM-2 huggingface dataset:
They are often effective in incredibly small concentrations; one caged virgin female of the introduced pine sawfly attracted over 11000 males. Some have been chemically identified and even synthesized. Its high specificity for particular target insects however makes this approach highly desirable. Such phenomena gave rise to the intriguing idea of using these natural or artificial pheromones to attract and trap insects, to lure them to contact poisons, chemosterilants or pathogens and to mask the location of females by saturating the environment with synthetic sex pheromones. Such techniques could offer highly specific control methods with little or no ecological side effects. It appears that adequate control from pheromones or attractants probably can only result if they are so highly effective as to be able to reduce the pest population to low level in the treated area and are used over a large area so that immigration of the pest from the outside would not negate the effort. Pheromone traps are commonly used for controlling various moths Heliothis, Spodoptera, Leucinodes etc. Chemical Control: Recent discoveries of new synthetic insecticides have sparked exciting advances and major breakthroughs in the control of insect enemies. Chemicals have subdued pests that once caused wide spread crop destruction, death of domestic animals and epidemics of insect borne human diseases. The modern insecticides are both effective and reliable. The whole world is resorting to them more and more for the solution of many insect problems. The chemicals which kill the insects by their chemical action are termed as insecticides. They are used for the protection of men, domestic animals, crops, agricultural products from the attack of insects when other methods fail to control the pests. Insecticides are seldom used in full strength but are formulated in a variety of ways to make them easier for application. Formulations of Insecticides: Following are the common formulations of insecticides viz.:. 1 Dusts, 2 Granular formulations, 3 Insecticide-fertilizer mixtures, 4 Wettable powders, 5 Solutions, 6 Emulsifiable concentrates, 7 Aerosoles, 8 Fumigants and 9 Miscellaneous formulations. Whatever may be the formulations the poisonous chemical present in an insecticide must penetrate the vital organs and tissues of the insect and ultimately kill it.
Insecticides are seldom used in full strength but are formulated in a variety of ways to make them easier for application. Formulations of Insecticides: Following are the common formulations of insecticides viz.:. 1 Dusts, 2 Granular formulations, 3 Insecticide-fertilizer mixtures, 4 Wettable powders, 5 Solutions, 6 Emulsifiable concentrates, 7 Aerosoles, 8 Fumigants and 9 Miscellaneous formulations. Whatever may be the formulations the poisonous chemical present in an insecticide must penetrate the vital organs and tissues of the insect and ultimately kill it. 1 Dusts: Insecticidal dusts are those powders which are used dry and mixed with or impregnated with certain organic materials or pulverised minerals powders such as talc, pyrophyllite, bentonite etc. These minerals are called carriers or vehicles since they carry the insecticide. Dusts are blown to deposit on plants by dusting machinery or blowers. Ground to a fine size, most dust will pass through a 325 mesh screen and range in size from 1 to 40 . The finished dust may be 0.1 to 25 active material. In dust form, in general, the toxicity of an insecticide increases as the particle size decreases. 2 Granular Formulations: These are similar to dusts except for larger particle size. The range of particle size in a granular product is designated by a two figures mesh classification e.g. 30 60 means that virtually all the insecticide granules will pass through a standard 30-mesh sieve while a negligible quantity will pass through a standard 60 mesh sieve. Some of the common granular formulations are 16 30, 20 40, 24 48 and 30 60. Granular insecticides are generally used as dressings on or in the soil and may be applied with fertilizer spreaders or special granule applicators. 3 Insecticide Fertilizer Mixtures: Insecticide fertilizer mixtures may be formulated by adding granular insecticides to commercial fertilizers or by spraying insecticides directly on to the fertilizer. Such mixtures are applied at the regular fertilizing time to provide both plant nutrients and control of soil insects.
Granular insecticides are generally used as dressings on or in the soil and may be applied with fertilizer spreaders or special granule applicators. 3 Insecticide Fertilizer Mixtures: Insecticide fertilizer mixtures may be formulated by adding granular insecticides to commercial fertilizers or by spraying insecticides directly on to the fertilizer. Such mixtures are applied at the regular fertilizing time to provide both plant nutrients and control of soil insects. 4 Wettable Powders: These are similar to dusts but they are meant to be diluted and suspended in water and used as spray. To make an insecticidal dust act in this manner a dispersing and wetting agent is added to the formulation. They are more concentrated than dust as they may contain as high as 75 toxicant. 5 Solutions:Many of the modern synthetic insecticides are insoluble in water but soluble in organic solvents. These soluble insecticides in solution form are used directly for insect control. They are however seldom used on plants because of their phytotoxic reaction. 6 Emulsifiable Concentrates: The most common and versatile formulation is the emulsifiable concentrate. This formulation consists of an insecticide, a solvent for the insecticide and an emulsifying agent. Mixing the concentrate with water forms an emulsion. The solvent used may evaporate quickly after spraying leaving a deposit of toxicant after the water has evaporated. The use of an emulsifying agent serves several purposes; it makes possible the diluting of a water insoluble chemical with water, it reduces the surface tension of the spray thus allowing it to spread and wet the treated surface more effectively, helps the spray and make a better contact with the insect cuticle. Generally oil soluble emulsifying substance is used. Normally emulsions are unstable and break up into their component parts. This action is termed breaking. For spraying on plants a quick breaking mixture is preferred. Since this results in heavier deposits of toxicant. 7 Insecticidal Aerosols: Aerosols are minute particles suspended in air or fog or smoke. The diameter of these particles range from 0.1 to 50 . The dispersion of insecticide into aerosol form may be accomplished by burning, vapourising with heat, atomizing mechanically or releasing through a small hole an insecticide that has been dissolved in a liquified gas. The last method of aerosol preparation gives the popular aerosol bomb.
The diameter of these particles range from 0.1 to 50 . The dispersion of insecticide into aerosol form may be accomplished by burning, vapourising with heat, atomizing mechanically or releasing through a small hole an insecticide that has been dissolved in a liquified gas. The last method of aerosol preparation gives the popular aerosol bomb. 8 Fumigants:Insecticides used in the gaseous form are known as fumigants. Fumigants are most often formulated as liquids under pressure and are held in tanks. When the liquid is released in open air it changes back to a gas, quite often fumigants are a mixture of two or more gases. 9 Miscellaneous Formulations: There are certain insecticides which are special formulations meant for specific uses. Often insecticides are stuffed in large pills and capsules and introduced into the stomach of animal. Insecticides may be mixed in shampoos, intended for use on house pets waxes for use on floors may contain an insecticide. Poison baits consist of toxicants combined with food stuff attractive to the insect pests. All these types of insecticides are special formulations designed for special purposes. Synergists: Some chemicals have the property of greatly increasing toxicity of certain insecticides. When the increased toxicity is markedly greater than the sum of the two used separately, it is termed a synergistic action. Most synergists have been used with pyrethrum or allethrin etc. Synergistic action is important because it provides a means for a more effective insecticide and it reduces the cost of control. Legal Control: Legal control is the lawful regulation of areas to eradicate, prevent or control infestation or reduce the damage caused by insects. This mainly involves the use of quarantines and pest control procedures. The central and state officials often work with local community or districts as in mosquito or locust control projects. Crop Harvesting: Harvesting: Have you ever wondered how we get food grains supplied neat and cleaned directly to the shop? Yes, farmers are using traditional and modern techniques for harvesting the crops grown. There are various stages to harvesting a variety of crops when the particular crop attains its maturity. Harvesting the crops at matured levels gives high income, and good quality produces. If the crops such as pulses, cereals, oilseeds, etc.,. Are left in the field for too long after maturity without harvesting, it can lead to the predisposition of pests.
Maturity indices are a set of indicators that tell us when our crops have reached their optimal stage for harvest, based on various factors like size, color, texture, or taste. Here are some maturity indices for vegetables that are commonly sold in the local markets. These indices can serve as a guide for growers and consumers in determining the ideal time to harvest and purchase these crops for optimal flavor and quality. Tomato For local markets in the Philippines, tomatoes are typically harvested when they have reached the breaker stage, which is when the fruit has just started to changecolor from green to red. This is because the market demand for tomatoes is usually for ripe, red tomatoes that are ready for immediate consumption. It is important for growers to keep in mind that tomatoes that are picked too early will not ripen properly and may not have the desired flavor or texture. On the other hand, overripe tomatoes may be too soft and have a shorter shelf life. Eggplant Eggplants should be harvested at the right stage of maturity to ensure good quality and yield. Commercial maturity for eggplant is generally reached when the fruit has reached its full size and firmness, and has developed a glossy, smooth skin with a uniform color. The fruit should have a dark purple or black color, be firm to the touch, and have a slight give when gently squeezed. The calyx, or stem, should be green and firmly attached to the fruit. It is important to note that overly matured eggplants may have a bitter taste. Squash When the squash is ripe, its color becomes dull or matte, and it loses its sheen. Another indication is the hardness of the skin. When the skin of the squash becomes hard and difficult to puncture, it is a sign that it is mature and ready for harvest. Additionally, the tendril near the stem of the squash plant starts to dry out and turn brown when the squash is mature. The leaves of the plant may also start to wilt or yellow when the squash is ready to be harvested. Onion Onions are ready for harvest when their leaves start to turn yellow and fall over. This is an indication that the plant has stopped growing and the bulbs have reached their full size. The outer skin of the onion bulb should also be dry and papery. Once the leaves have fallen over and the skin is dry, the onion bulbs can be pulled from the ground and left to dry for a few days in a cool, dry, and well-ventilated area.
This is an indication that the plant has stopped growing and the bulbs have reached their full size. The outer skin of the onion bulb should also be dry and papery. Once the leaves have fallen over and the skin is dry, the onion bulbs can be pulled from the ground and left to dry for a few days in a cool, dry, and well-ventilated area. After drying, the onions can be cleaned, trimmed, and stored. Garlic The timing of garlic harvest is determined by the maturity of the bulbs, which is indicated by the drying and browning of the leaves. When approximately one-half of the leaves have turned yellow or brown and have begun to dry out, it is time to harvest the garlic bulbs. Bitter gourd Bitter gourds are harvested when they have reached a length of 4-6 inches and a diameter of about one inch. The color should also be dark green, which indicates that it is still young and tender. The seeds inside the bitter gourd should be small and white, which indicates that the vegetable is still young and has not yet matured. Cucumber Cucumbers are typically harvested when they are young and tender for best flavor and texture. Cucumbers intended for the local market are usually harvested when they are still green, although some varieties may have a slightly yellow or white coloration. Over-ripe cucumbers will turn yellow or orange and are no longer suitable for the market. Cucumbers intended for fresh consumption should have a crisp texture and a slightly sweet, mild flavor. Overly matured cucumbers may have a bitter or unpleasant taste. It is important for growers and consumers to know the maturity indices of vegetables because it helps ensure that the vegetables are harvested at the optimal time for consumption or processing. For growers, knowledge of maturity indices can help them plan their planting and harvesting schedule, as well as manage their resources more efficiently. For consumers, knowing the maturity indices can help them choose the freshest and most nutritious vegetables, as well as get the best value for their moneyMethods of Harvesting There are three essential methods of cutting the crop or harvesting. 1. Hand Harvesting Manual Harvesting: Hand harvesting is a method of gathering grains, fruits, vegetables, leaves, etc.,. By hand or manually. Fig: Hand Harvesting 2. Harvesting with Hand Tools: Farmers use a few tools to harvest the crops.
Cleaning, fumigation, and drying are done to the stockroom before the grains are stored or deposited. The grains are later transported to dissimilar places throughout the year. Importance of Harvesting 1. Harvesting crops by using advanced technology reduces the wastage of grains and increases in quality and quantity. 2. The direction of cutting fruits, grains and vegetables are very important during harvesting to save the quality of the fruits and also, we should see that the tools used should not damage the plant. 3. Harvesting at the right stage enriches the quality of grains or seed protection. Summary Harvesting is the act of gathering the edible parts of the plant after they approach the stage of maturity. Harvesting of crops is done using many tools and types of machinery in the agricultural fields. The tools that are used while harvesting, such as sickle, axe, etc.,. To harvest the crops like paddy, wheat, maize, grass, etc. Hand harvesting, harvesting with hand tools and harvesting with machinery are the three harvesting methods. Reaping, threshing, cleaning and hauling are the four stages of harvesting. The importance of harvesting crops by using advanced technology reduces the wastage of grains and increases in quality and quantity. Post-Harvest Management Best Practices and Methods Reducing post-harvest loss is critical. Great post-harvest management will help address the growing concerns around food sustainability. What does post-harvest mean? Post-harvest process is the stage that immediately follows the harvest. The final quantity and quality of the product depends on it. Appropriate pre-harvest practices and harvesting the crop at the right time using adequate farming equipment are also important in order to optimize the overall postharvest output. Additionally, post-harvest management includes various steps such as: Drying: This decreases the moisture levels to ensure safe storage and prevents grain germination. It also reduces the risk of fungal attack and contamination by aflatoxin, maximizing the quality of crops retained. Threshing Shelling: Threshing or shelling of grains helps to reduce the required storage capacity and minimize the susceptibility of the grain to pests. Cleaning Winnowing: This involves removing any foreign matter from the grain, such as leaf, stalk, or empty seeds, in order to optimize its market value. Storage: Protecting the grain from climatic changes and contamination by insects and pests is crucial. Various post-harvest grain storage methods can accomplish this.
Cleaning Winnowing: This involves removing any foreign matter from the grain, such as leaf, stalk, or empty seeds, in order to optimize its market value. Storage: Protecting the grain from climatic changes and contamination by insects and pests is crucial. Various post-harvest grain storage methods can accomplish this. Transport: Grains sold to buyers are transported to warehouses or markets where they are made available to the common folk. Minimize post-harvest losses and preserve produce by correctly following the steps above. How does grain storage play a major role? Agricultural products are stored before they are made available and accessible to the public. The storage process keeps grains, whether in bags or in bulk, in a storage structure. The structure, designed to protect the stored product for a short or long period, hosts the grains awaiting movement to other locations. Grain storage occurs at three levels: producer s level, trader s level, and urban organization storage level. Storing it is necessary for the following reasons: To provide a uniform supply of food throughout the year. Grains are produced seasonally while consumption is a constant. To provide reserve for contingencies such as flood, drought, pandemics, and other calamities. To speculate a good price either in domestic or in export markets. Hence storage is fundamental to the concept of food security. What happens if grain storage is improper? The main cause of deterioration of grain quality and decrease in grain quantity is improper storage. This can occur due to: Weather changes: Changes in climatic conditions such as rain, humidity, increased dampness, moisture; heat can harm the grain quality and seed viability. Infestation: Unfavorable environmental conditions can also make the grain more vulnerable to infestation by insects, pests, and molds. Incorrect Grain Storage resulting in post-harvest losses In fact, rodents and birds often attack incorrectly stored grains. They can not only feed on the grain, but also contaminate it with their urine, droppings, and hair feathers. These problems caused due to improper storage result in post-harvest losses in the form of: Weight loss of the agricultural produce. The grain is prone to rancidity or it may undergo sprouting, over-ripening if not stored properly. There is loss in quality and market value of the produce. Furthermore, the nutritive value of the grain also decreases.
The grain is prone to rancidity or it may undergo sprouting, over-ripening if not stored properly. There is loss in quality and market value of the produce. Furthermore, the nutritive value of the grain also decreases. What are the correct post-harvest storage methods?Proper grain storage methods are the key to reducing post-harvest losses. The quantity of produce and the duration of storage are important to choose the proper storage method. Storage in bags: Storing grains in bags is convenient for short-term storage when grains are intended to be moved early. Short term storage duration requires few measures against insects. Loose storage: Large quantities of grains can be stored in loose bulk storage. Requirements for correct storage are: A good storage site: Ventilate and keep the site cool. Have a strong roof to protect from high winds and rain. Ideally, raise the site off the ground to prevent ground water soaking into the stored grains. Produce in suitable condition: Ensure that the crop going into the store is in good condition, cleaned and well dried. It is also necessary to store the grain at the right moisture content. Intake of grain is orderly and controlled: Maintain the air-tight barrier each time the storage unit is opened and closed. Quality maintenance ensured: Keep stored grains in the shade to protect them from rodents and birds. Security against theft and loss: Keep the storage area locked in order to limit access. Any loss is identifiable and accountable: Regularly inspect the store to maintain the condition of crops throughout the storage period. Adherence to these requirements helps to know the quantity stored at any given time, decrease the grain loss during storage, and quickly recognize the causal agents of losses and accordingly control them. Hermetic storage Hermetic Bags by Save Grain Bags A post-harvest storage technology, Hermetic storage protects grain by creating an oxygen-deficient and carbon dioxide-rich atmosphere that is incompatible with the survival or breeding of pests. It creates an airtight and moisture-tight barrier, preserving the agricultural products in their optimal form.
All art uses some blend of many or all of these aspects in order to be pleasing to the eye or to communicate its message. For example, Grant Wood's Fall Plowing uses a blend of color, repetition, line, shape and balance to bring his piece to life. He uses bold greens, yellows and reds, hard, flowing crop lines, and repetition of fun shapes to guide the viewer's eye over what seems to be a fairly serene scene of a freshly plowed field. To analyze the visual elements of visual arts one has to Consider the composition, colors, textures, size, space, and other visual and material attributes of the artwork The seven principles of visual arts 1. Balance refers to the visual weight of the elements of the composition. It is a sense that the painting feels stable and "feels right.". Imbalance causes a feeling of discomfort in the viewer. Balance can be achieved in 3 different ways: Symmetry, in which both sides of a composition have the same elements in the same position, as in a mirror-image, or the two sides of a face. Asymmetry, in which the composition is balanced due to the contrast of any of the elements of art. For example, a large circle on one side of a composition might be balanced by a small square on the other side Radial symmetry, in which elements are equally spaced around a central point, as in the spokes coming out of the hub of a bicycle tire. Contrast This is the difference between elements of art in a composition, such that each element is made stronger in relation to the other. When placed next to each other, contrasting elements command the viewer's attention. Areas of contrast are among the first places that a viewer's eye is drawn. Contrast can be achieved by juxtapositions of any of the elements of art. Negative Positive space is an example of contrast. Complementary colors placed side by side is an example of contrast. Notan is an example of contrast. Emphasis This is when the artist creates an area of the composition that is visually dominant and commands the viewer's attention. This is often achieved by contrast. Movement is the result of using the elements of art such that they move the viewer's eye around and within the image. A sense of movement can be created by diagonal or curvy lines, either real or implied, by edges, by the illusion of space, by repetition, by energetic mark-making.