There are many kinds of vegetables, different biological characteristics, and different requirements for nutrition. Therefore, adopting different fertilization methods for different types of vegetables not only saves fertilizer, but also enables high yield, quality, and efficiency of vegetables.
1. Leaf vegetables mainly include cabbage, green vegetables, spinach, leeks, etc. Nitrogen fertilizers are the main nitrogen fertilizers for leafy vegetables, but phosphorus fertilizers and potassium fertilizers must be added at the same time when nitrogen fertilizers are used during the growth period. If you cultivate cabbage, seize the second fertilization that begins to enter the rosette stage and before the package is the key to high yield. For example, if the supply of nitrogen is insufficient during the whole growing season, the plants are dwarf and the tissues are rough. In the spring, the cultivated leafy vegetables are also easy to twitch early. In the late period, the phosphorus and potassium fertilizers of the cabbage leafy vegetables are insufficient, and it is often difficult to make the ball.
2. Fruit vegetables include melons, solanaceous fruits and beans, and edible parts are plant fruits. Generally, seedlings need more nitrogen, but excessive application of nitrogenous fertilizers can lead to leggy, which in turn prolongs flowering and results, increases flowering and falling fruit, and enters reproduction. During the growing season, the demand for phosphorus increased rapidly, but the amount of nitrogen needed was slightly reduced. Therefore, the application of phosphorus and potassium fertilizers should be increased to control the amount of nitrogen fertilizer. After cucumbers were set up, they should be re-fertilized. After each batch of melons, the fertilizer and water should be added.
3. Root vegetables mainly include radish, carrots, mandarin, etc. The edible portion is fleshy root. In the early stage of growth, nitrogen is mainly supplied to promote the formation of large green leaves. In the middle and late stages of growth (the period of growth of fleshy roots), more potassium fertilizer should be applied, and the amount of nitrogen fertilizer should be appropriately controlled to promote the transport of assimilated substances from the leaves to the roots so as to form a strong fleshy mass. Straight roots, if the late nitrogen fertilization too much potassium fertilizer, it is easy to make the ground part of the leggy, small roots, yield, quality deterioration.
Greenhouses and other protected vegetables have a much larger amount of fertilization per unit area than exposed vegetables, and most of the remaining fertilizer remains in the soil due to no rainwater leaching, causing excessive concentration of soil solution and impeding the root from absorbing nutrients or damaging the root system. Therefore, facilities for cultivation of vegetables, should fully consider the after-effect of the former fertilizer, apply more organic fertilizer, appropriate less fertilizer, to avoid the damage caused by salt accumulation of the crop, so as to further give play to the advantages of vegetables in the protection.
Oranges are an important nutritional source for human health and have immense economic value. Citrus orange orange-yellow colour, gratifying fruit savory, harmonious sourness and sweetness, soft taste, flavor is rich and generous.Citrus is believed to be native to southeast Asia, and cultivation of fruit crops occurred in China at least 4,000 years ago.Citrus is a large genus that includes several major cultivated species, including Citrus sinensis (blood orange), Citrus reticulata (tangerine and mandarin), Citrus limon (lemon), Citrus grandis (pummelo) and Citrus paradisi (grapefruit).citrus fruits and juice are the prime human source of vitamin C, an important component of human nutrition.citrus-unique characteristics have hindered the study of citrus genetics and breeding improvement. Complete genome sequences would provide valuable genetic resources for improving citrus crops.
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