Catharanthus roseus with stems erect, plant height 30 cm to 60 cm, dwarf species 25 cm to 30 cm. Leaves opposite, oblong, often thick green shiny. The flowers are solitary or few, and the varieties are rose red and pure white. Native to the tropics, China's warm areas and common greenhouse cultivation.
The periwinkle flower is hi and warm, not cold tolerant and hi of sunshine, but avoid dry heat, so it should be fully watered in the summer, strong and healthy, with few pests and diseases. Hi moist sandy loam soil, the general soil can also be cultivated, but the soil is hard to grow well.
Changchun flower pots should pay attention to the application of basal fertilizer, suitable for planting loose soil with rich humus. When there are 3 pairs of true leaves in the seedlings, the pots are transplanted. After the planting, attention should be paid to the management of the water, watering should not be excessive, and the wet and the poor growth and development.
Changchun flower pots should pay attention to the application of basal fertilizer, suitable for planting loose soil with rich humus. When there are 3 pairs of true leaves in the seedlings, the pots are transplanted. After the planting, pay attention to water and fertilizer management, watering should not be too much, too wet, the growth and development is not good. When the seedling grows to 6 cm to 7 cm, it must be picked up once. Afterwards, it must be plucking the heart twice to promote its multiple branches and blossom. During the vegetative growth period, more nitrogenous fertilizers should be applied, such as decomposed liquid residue fertilizer and urea, and phosphorus and potassium fertilizers should be applied before the buds during reproductive growth, and 0.5% potassium dihydrogen phosphate can also be sprayed on the leaves. It can make its leaves dark green, shiny, and can promote its frequent flowering, pure color, after the flowers should be cut off the residual flowers.
Periwinkle flowering usually occurs in spring. To blossom earlier, seedlings can be planted in greenhouses in early spring, and cuttings can also be propagated. Rooting is easy, but growth is less robust than real growth.
In addition, vinca contains a variety of alkaloids, some alkaloids are toxic, some have medicinal value, but not blindly abuse or when the tea, so as not to cause adverse consequences.
Food additives refer to chemical synthetic or natural substances added to food for the purpose of improving food quality, color, aroma and taste, as well as for the needs of anti-corrosion and processing technology. Generally, food additives may not be food and may not have nutritional value, but they must conform to the concept of the above definition, that is, do not affect the nutritional value of food, and have the function of preventing food spoilage, enhancing food sensory properties or improving food quality.
Generally speaking, food additives can be divided into natural and synthetic categories according to their source. Natural food additives refer to natural substances extracted from the metabolites of animals, plants or microorganisms as raw materials. Chemically synthesized food additives refer to substances obtained by chemical means through oxidation, reduction, condensation, polymerization, salt formation and other synthetic reactions of elements or compounds. Most of the chemicals used today are synthetic food additives.
According to the use, the classification of food additives in various countries is almost the same, the difference is mainly the difference in the classification of how much. The United States divides food additives into 16 categories, Japan into 30 categories, China's "Health Standards for the Use of Food Additives" divides them into 22 categories: Antioxidant preservatives (1) (2) (3) (4) bleach hair color agent (5) concreting citric acid (6) (7) loose agent (8) thickening agent defoaming agent (9) (10) sweetener (11) colorants emulsifier (12) (13) improver (14) anticaking agent (15) flavor enhancer (16) (17) of enzyme preparation was preparing foaming agent (18) (19) preservatives (20) spices (21) nutritional fortifier (22) other additives.
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