Irrigation of farmland pays attention to four kinds of fertilizers
The application method of irrigating with water is also called “fertilizingâ€, and it is generally a kind of top dressing that provides nutrients during the period of rapid growth of the crop. Since it is a supplementary fertilizer, it cannot replace basic fertilizers such as basal fertilization. However, because this method is convenient and fast, it is widely used in irrigated fields of vegetable fields and cash crops and special food crops. At present, the fertilization is mainly used in the vigorous season of growing vegetable crops, and is widely used in greenhouse cultivation and open field vegetables. Due to the rapid fertility of fertilization, it is generally effective from 2-3 days to 3-5 days after rinsing. It is reflected in the changes in leaf color and plant height, which is in line with the enthusiasm of some eager growers. It has been widely used for many years. Considering comprehensively the agricultural production targets with high yield, high quality, high efficiency and taking into account of environmental protection, and the current situation of the lack of rural labor force, in order to give full play to the strengths of “fertilization and fertilization†to avoid its shortcomings, the technical essentials of “flooding and fertilization†are briefly described as follows: 1. Correct selection of fertilizer types for fertilization Only water-soluble fertilizers can be applied with water. Urea, ammonia, ammonium sulfate and ammonium nitrate are commonly used in nitrogenous fertilizers; potassium and potassium sulfates are used in potash fertilizers, and potassium nitrate can also be used. Even phosphorus-containing ammonium phosphate and diammonium phosphate do not need to be flushed. Because the phosphate fertilizer has poor mobility after being dissolved, it is easily fixed and cannot infiltrate into the root layer with water. The best application method of phosphate fertilizer can only be layered buried in the soil in order to improve its utilization. 2, fertilize a single nutrient Be sure to reduce the amount of pure nitrogen used in the cultivation of high-yielding vegetables at the rate of 2-3 kg/mu, especially nitrate nitrogen to be controlled below 2-3 kg/mu, with a limited amount of potassium fertilizer (potassium oxide). Usually 2-4 kg/mu; otherwise, nutrients are wasted and lost. It will not only reduce the nitrogen fertilizer utilization but also cause pollution to water quality. Fertilization in the whole growth period is generally 2 times. 3, the period of fertigation In the case of a large crop growth period, if the vegetables are flushed after fruiting and picking the fruits, if the cabbage is in the filling phase, in the autumn planting, the choice of temperature will decrease, the soil mineralization will decline, and the vegetable crop will be heavy. The growth period is appropriate. 4, the amount of irrigation control In the case of flood irrigation, flood irrigation is prevented, and when the canal is irrigated, the depth of the ditch is appropriate to the amount of water, so that nutrients dissolved in the water are prevented from being lost. Many farmers like to use this top-dressing method and it is effective to use it. However, in order to pursue the effect of the surface, regardless of the cost, one-sided use of large amounts of nitrogen fertilizer, misuse of fertilization, will lead to vegetables, longevity, quality, fertilizer use efficiency, loss of nitrogen, increase soil salinization. Some people break down granular high-concentration compound fertilizers and crush them; others use unprocessed and insoluble solid organic fertilizers or microbial preparations as fertilizers. These are not appropriate. In short, we must master the following points in principle: The method of fertilization should be applied in a timely and appropriate manner. It is mainly used for top dressing in intensive vegetable cultivation, and nitrogen and potassium are mainly applied. There are four types of fertilizers that do not require flushing, one that does not flush phosphorus, two that do not flush granular compound fertilizers, three that do not flush solid organic fertilizers, and four that do not crush microbial preparations or fertilizers. An organic compound formed by dehydration of amino acids, containing carboxyl and amino groups, and being amphoteric. Also known as "peptide".
Three, is related to the biological body of a variety of cell functions of biological active substances. Hundreds of peptides have been found in living organisms, which are essential participants in the body's complex physiological activities. All cells can synthesize peptides and their functional activities are regulated by peptides. It involves hormones, nerves, cell growth and reproductive fields, and its importance lies in the regulation of various systems, organs and cells in the body. The physiological and pharmacological effects of enzymatic polypeptides are mainly to activate related enzymes in vivo, promote the permeability of intermediate metabolic membrane, or affect specific protein synthesis by controlling DNA transcription or translation, and eventually produce specific physiological effects or play their pharmacological effects. Peptide is better than amino acid, one is faster than amino acid absorption; Second, it is absorbed by the body in a complete form; Third, active absorption (amino acids are passive absorption); Fourth, low consumption, compared with amino acids, peptide absorption has the characteristics of low consumption or no energy consumption, peptide absorption through the duodenum, directly into the blood circulation, their own energy nutrition transported to various parts of the human body; Fifth, peptide absorption is less than amino acid, with the characteristics of unsaturated; Sixth, there are only 20 kinds of amino acids, with countable functions, while peptides take amino acids as substrates, which can be synthesized into hundreds of thousands of kinds.
It is mainly divided into medical polypeptide drugs, peptide antibiotics, vaccines, antimicrobial peptides for agricultural use, small peptides for feed, cosmetics for daily use, soybean polypeptides for food, corn polypeptides, yeast polypeptides and sea cucumber peptides. buy peptides,peptides benefits,peptides bpc 157,peptides buy,peptides cjc 1295 Shaanxi YXchuang Biotechnology Co., Ltd , https://www.peptide-nootropics.com
Two, one of the amide. It consists of two or more amino acids joined by the amino group of one amino acid to the carboxyl group of the other. An amino acid cannot be called a peptide, nor can a peptide be synthesized, but must be a compound of two or more amino acids linked by a peptide bond. Compounds where two amino acids are linked by a peptide bond are called dipeptides; A compound with three amino acids linked by peptide bonds is called a tripeptide, and so on, a compound with thirty-four amino acids linked by peptide bonds is called a thirty-four peptide.
A peptide is a chain of polymers of amino acids
A peptide is a chain of polymers of amino acids
From the functional point of view, can be divided into antihypertensive peptide, antioxidant peptide, cholesterol lowering peptide, opioid active peptide, high F value oligopeptide, food strong taste peptide and so on.
Active peptide, and nutrition, hormone, enzyme inhibition, regulation of immunity, antibacterial, antiviral, antioxidant has a very close relationship. Polypeptides are generally divided into: polypeptide drugs and polypeptide health products. Traditional peptide drugs are mainly peptide hormones. The development of peptide drugs has been developed into various fields of disease prevention and treatment, especially in the following fields. [2]
Antitumor polypeptide
Tumorigenesis is the result of many factors, but ultimately all involve the regulation of oncogene expression. In 2013, many tumor-related genes and regulatory factors have been discovered. Screening peptides specifically bound to these genes and regulatory factors has become a new hot spot in the search for anticancer drugs. For example, somatostatin has been used to treat endocrine tumors of the digestive system; American scholars found a hexapeptide can significantly inhibit adenocarcinoma in vivo; Swiss scientists have discovered an octapeptide that induces apoptosis in tumor cells. [2]
Antiviral polypeptide
By binding to specific receptors on host cells, viruses adsorb cells and rely on their own specific proteases for protein processing and nucleic acid replication. Therefore, peptides binding to host cell receptors or active sites such as viral proteases can be selected from the peptide library for antiviral therapy. In 2013, many small peptides with antiviral properties have been screened from peptide banks in Canada, Italy and other countries, and some small peptides have entered the stage of clinical trials. In June 2004, the Chinese Academy of Sciences institute of Microbiology came out of the news, which was undertaken by the Chinese Academy of Sciences known