In the greenhouse vegetable production, topdressing is a very important farming operation, and the topdressing almost runs through the entire growth period of the vegetables. The method of topdressing is mainly based on the application of fertilizer with water, compound fertilizer, large amount of elemental water soluble fertilizer, humic acid fertilizer, biological bacteria, etc., can be used as top dressing. There are so many kinds of fertilizers, many farmers do not know when to use which fertilizer, so some fertilizers have been used, resulting in the accumulation of salt in the soil, some topdressing is insufficient, vegetables are not enough. It is recommended that the vegetable farmers fill the fertilizers in stages to ensure that the vegetables are not enough to eat.
Pre-growth fattening
In the pre-growth period, from the seedling colonization to the flowering and fruit setting, the crops are mainly vegetatively grown. Therefore, after the vegetables are planted, the root system should be paid attention to. After rooting, the rooting of vegetables is slow, and rooting products can be used to assist rooting to promote rapid seedling growth. In the seedling stage, there is not much mineral nutrition. After the seedlings are slowed down, it is recommended to apply amino acid, chitin, biological bacteria and other functional fertilizers to promote rooting, which not only can protect the soil and roots, but also balance plant growth. When the roots are strong, the plants have strong disease resistance and can prevent various seedling diseases.
In the middle of the growth, the strong fruit grows in both hands.
In the middle growth period, before flowering and fruit set to premature senescence of the plant, the vegetative growth and reproductive growth of the crop go hand in hand, both to take the yield and to ensure the growth of the plant. Therefore, at this stage, the high-potassium fertilizer is the main fertilizer, supplemented by the nitrogen, phosphorus and potassium balance type. It is recommended to continuously flush the high-potassium type twice, and then cooperate with the first-time equilibrium type to avoid low potassium and high nitrogen in the soil and imbalance of nutrients. In the high price period of vegetables, many vegetable farmers in order to continue to produce a large number of results, continuous flowering, high potassium fertilizer, resulting in plant vegetative growth is too weak, eventually leading to plant weakness and death, which has a lot to do with improper fertilizer. If the plant is weak, timely fruit thinning, high nitrogen fertilizer, and conservation of stems and leaves, the plant can be gradually restored.
Enhanced resistance to premature aging in late growth stage
In the later stage of growth, the plants begin to prematurely decay to the garden, and the crops are mainly reproductive growth. At this stage, the management of vegetable farmers is often lax, with less or less fertilizer, resulting in severe aging of plants. Even some vegetable growers have to keep the yield in order to maintain the yield, and the plant's nutritional burden is not considered at all. As a result, the plant is overloaded, the disease resistance is greatly reduced, and various invasive diseases are accompanied in the later stage. In order to take high yields in the late stage of vegetable growth, high-nitrogen fertilizer should be used. Because there is no shortage of potassium fertilizer in this stage, the lack of nitrogen fertilizer is much better than that of high-potassium fertilizer. Nitrogen fertilizer promotes vegetative growth, promotes regeneration of stems and leaves, enhances plant resistance, and reduces disease occurrence.
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Plant extraction process
1. Select plants/herbs. No more than ancient prescriptions, prescriptions, folk herbs to find. At present, common and uncommon herbs have been studied. At present, it is mostly to increase the amount of medicinal materials to extract and separate components with low content, or to find medicinal plants that have never been studied from miao medicine, Tibetan medicine, Mongolian medicine, Africa, Latin America and other places.
2. The extraction. Solvent petroleum ether, n-hexane, cyclohexane, benzene, chloroform, ethyl acetate, n-butanol, acetone, ethanol, methanol, water (low polarity → high polarity). Daily medicine decoction effective, water and ethanol and other solvents with large polarity, such as artemisinin boiling ineffective extraction with petroleum ether and other solvents with small polarity. Common medicinal materials water/alcohol/ether to go through, separation and identification of more compounds.
3. The separation. This is the most important work. In the solution extracted from the second step, there are dozens of compounds, usually by column chromatography, which is often referred to as the column flushing. It's a lot of work, it's boring, it's low tech. A master's student might do this every day for two years. The column for separating compounds, as shown below, is as large as 2 meters high and as small as 10 centimeters. Change the solvent condition of mobile phase, change the material of column, different conditions and different separation principles of column repeatedly punching, can be separated from the monomer compound.
Herbal Medicine,Ginger Extract Powder,Hawthorn Berry Extract,Lycium Berry Fruit Extract
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