The key to field management of corn seedlings is to properly control the growth of stems and leaves, promote root development, ie, "control and promote the next," to reach more roots, flat stems, dark green leaves, generous leaves, individuals robust, neat groups. The specific measures are:
Transplanting seedlings to ensure that the whole seedlings
After the emergence of corn, it is necessary to promptly check the emergence of seedlings and find that the lack of seedlings and ridges must be timely replanted and supplemented. 3 before the leaf stage lack of seedlings, with a full seed soaking germination watering reseeding. After the 3rd leaf stage, the seedlings are transplanted with soil and transplanted with seedlings (planting can be performed between the rows for seedlings). In addition, the lack of seedlings can also be remedied by leaving two plants nearby. Early seedlings
When the corn grows to 3 to 4 leaves, it will be planted and timed to remove weak, yellow, disease, inferior and hybrid seedlings. When 5 to 6 leaves are reached, the seedlings are planted according to the planned spacing and density, and the remaining seedlings are unplugged. When setting the seedlings, the lines and fields can be kept slightly denser to give full play to their marginal advantages. When setting up seedlings, the seedlings to be removed should be cleared out of the field in time. Timely fertilizer
Maize seedling topdressing should be applied at the beginning of the five leaves, that is, at the 4 to 6 leaf stage, especially for interplanting corn and summer corn sown. The top dressing should follow the principle of light weight, ear weight and grain fertilizer, and The ratio of topdressing is about 2.5 to 3 seedlings, 5 to 6 ears, and 1.5 to 2 grains. If the intercropping corn or sorghum sowing summer corn has insufficient base fertilizer or no base fertilizer, the amount of top-dressing fertilizer should be increased, but the proportion of the three phases generally does not change.
Timely cultivator
The timely cultivation of corn seedlings can play a role in “control and promotionâ€. It is especially important for interplanting corn and summer maize with poor soil preparation. Seedling cultivating generally 2 to 3 times. The first time the seedlings were planted, the cultivator learned the principle of "middle seedlings shallow and middle depths" in order to remove the weeds and not press the seedlings. Deep tillage was generally 3 to 5 cm. The second and third time before jointing, the depth of cultivation should be appropriately deeper, generally about 10 centimeters is appropriate. At this time, deep and medium tillage will cut off some fine roots, but it can promote new roots. The soil should be gradually completed from the 9th to the 10th leaf stage before heading to facilitate the formation of roots and enhance the lodging resistance of the plants.
Appropriate seedlings are strong
The methods commonly adopted by seedlings to promote growth are: control of fertilizer and water, deep cultivator, and soil drying. Corn seedlings should follow the principle of seedlings that are "not black, yellow, no fat, no moisture, no phlegm". That is to say, the dark green, fertile, and sturdy seedlings of young plants. On the contrary, it does not worry. The seedlings are usually sowed in summer and interplanted with corn for about 20 days. The time is too short to be effective. If the time is too long, it is easy to form “small old seedlings†and affect the later growth. After the seedlings are over, they should immediately top-dressing and irrigating to promote growth. For fields where the growth of seedlings is weak, not only do not plant seedlings, but also take timely fertilizer and water measures to promote seedling growth.
The management of corn pests and diseases: high temperature in summer, various pests and diseases are harmful to corn plants. The main diseases are sheath blight and head smut, and the control of sheath blight can peel off the lower epidermis and spray Jinggangmycin. When the smut strain is found, it must be removed or buried in a timely manner. Insect pests mainly include corn borers, locusts, etc. Control methods can be consulted with the local agricultural resources department.
In the middle and later stages, discretion should be made according to the status of fertility requirements, moisture content, pests and diseases, etc.
Plant extracts refer to a class of substances derived from plants that have one or more biological functions. Can be separated by physical and chemical extraction of one or more effective components formed by natural products.
There are many kinds of plant extracts. At present, natural plant extracts mainly include essential oils, saponins, alkaloids, polysaccharides, polyphenols, flavonoids and so on. According to the biological activity, it can be divided into antioxidants: grape seed extract, green tea extract, pine bark extract, etc. Immune modulators: ginseng extract, gynostemma pentaphyllum extract, Ganoderma lucidum extract, etc. Improve cardiovascular function: ginkgo biloba extract, lotus seed heart extract, rhodiola extract, etc. Sedative: valerian extract, hop extract and so on.
According to their own characteristics in the market application of plant extracts can be roughly divided into six categories: coloring, seasoning, medicinal, health, dietary supplements and feed additives. Natural plant pigments refer to pigment components in roots, stems, leaves, flowers, fruits and bark of plants, such as turmeric, sappanwood, indigo, safflower, black bean and green walnut peel. Natural plant pigments are widely used in food, textiles, cosmetics, medicine, leather industry, printing and dyeing and other industries.
Plant extracts are rich in ingredients that can effectively stimulate the senses, such as sweeteners and volatile substances. Natural sweeteners, such as stevia glycoside and grosvenin, are popular new sweeteners. They are not only sweet, but also ideal substitutes for sucrose. Essential oils are concentrated volatile substances that are commonly used in the preparation of fragrances and are widely recognized in plant extracts.
Contained in the plant extracts of saponins, alkaloids, polyphenols, flavonoids and other ingredients are widely study has many biological activities, such as antioxidant, antibacterial, anti-inflammatory, improve animal production performance, antivirus, enhance immunity, etc., for human and animal health has the effect of nots allow to ignore, and the development of its pharmacology and health care function has become the main trend of plant extracts.In addition, as a dietary supplement, it is one of the main applications of various plant extracts. Such as oligosaccharides (oligosaccharides, oligosaccharides, oligosaccharides, galactose, etc.) dietary fiber, soybean protein, dietary fiber, wheat albumin, L-arabinose, sugar alcohol (xylitol, malt heavy sugar alcohol, sorbitol, etc.) and other natural plant food additives have been widely used in the food health care market. Many plant functional ingredients with anti-inflammatory, antioxidant and bacteriostatic properties are also commonly used as substitute anti-bacterial products. The application of green feed additives in livestock and poultry production has been vigorously developed, such as green tea polyphenols extract, pine bark procyanidins extract and polyanthocyanidins extract.
Due to the changes in lifestyle, working mode and consumption mode, more consumers are pursuing the life concept of "big health". The so-called "big health" refers to a concept of whole-process, comprehensive and total factor care for people's life around the basic necessities of life, life, old age, illness and death. It not only pursues individual physical and physical health, but also pursues mental, spiritual, social, environmental and family health. In the era of "great health", natural plant-based health products are the core and the key material basis.
With increasing attention to the food and drug safety, from natural plant in the development and utilization of the active ingredient is becoming more and more attention, a large number of food safety, have certain curative effect function of plant extracts have been used as raw materials in a variety of ways into functional food nutrition and health food has entered people's lives, and will play a more and more important role.
And more and more new research new discovery, predicts that the plant extract industry chain will have more members to join, there will be more business opportunities. The future domestic plant extract market will stride forward gradually to mature period!
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