It is forbidden to apply urea. Urea belongs to ammonium nitrogen fertilizer. It cannot be directly absorbed and used by crops after being applied to the soil. It needs to be converted into ammonium nitrogen by the urease secreted by urea bacteria in the soil to be absorbed by the root system. The rate of urea conversion depends mainly on soil temperature. If all the urea applied to the soil is converted into ammonium nitrogen, it takes 7 to 10 days at a ground temperature of 10 ° C, 4 to 5 days at 20 ° C, and only 2 to 3 days at 30 ° C. It can be seen that when crops are topdressed in winter or early spring, if urea is applied, it will often affect crop growth because of slow fertilizer effect.
The absorption of phosphorus and zinc by the increased application of phosphorus and zinc fertilizers was significantly affected by temperature and light. Low winter temperatures and insufficient sunlight can easily induce phosphorus deficiency and zinc deficiency in winter crops. Phosphate and zinc fertilizers should be appropriately applied. In addition, phosphorus can enhance the cold resistance of plants, and increasing the application of phosphorus fertilizer is beneficial to the prevention and control of crop freezing damage.
Disclaimer: Some articles on this website are transferred from the Internet. If you have third party legal rights, please inform this website to deal with them. phone
Human chorionic gonadotropin is a hormone for the maternal recognition of pregnancy produced by trophoblast cells
Human chorionic gonadotropin (HCG) is a glycoprotein secreted by trophoblast cells of the placenta And β dimer proteins. The molecular weight of glycoprotein hormone 36700, A. Pituitary, FSH, follicle stimulating hormone, LH (luteinizing hormone) and TSH (thyroid stimulating hormone) are basically similar, So they can cross-react with each other, while the structure of β subunit is not similar. In mature women, the fertilized ova move to the uterine cavity for implantation and form embryos. In the process of development and growth into the fetus, the placental syncytiotrophoblast cells produce a large amount of HCG, which can be excreted into urine through the blood circulation of pregnant women. Serum and urine HCG levels rise Rapidly from 1 to 2.5 weeks of gestation, reaching a peak at 8 weeks of gestation and dropping to moderate levels at 4 months of gestation, which remain at the end of gestation. At present, the commonly used detection methods are: latex aggregation inhibition test and hemagglutination inhibition test; Radioimmunoassay (RIA); Enzyme linked immunosorbent assay (ELISA); Monoclonal antibody colloidal gold test
Hcg Powder,Custom Ghrp Peptides,High Purity Hcg Powder,Popular Peptide Bodybuilding Powder
Shaanxi YXchuang Biotechnology Co., Ltd , https://www.peptide-nootropic.com