The water and fertilizer treatment in the germination process is one of the indispensable conditions for seed germination(propagation tray). Chinese cabbage seeds are in a high temperature stage when they germinate, and are easily flooded. However, due to the underdeveloped seedling roots, the ability to absorb water and fertilizer is weak, and in the hot season(72 cell propagation trays wholesale), it is necessary to provide sufficient water and nutrients in real time based on climate change.(greenhouse plastic seedling tray manufacturers nz)
The seedlings can be simmered for 10-15 days under the control of water(gallon nursery pots). Therefore, the watering should be combined with the fertilization and topdressing, and the amount of fertilizer applied is 7.5 kg of ammonium sulfate per mu. In addition, some weak seedlings should be fertilized to catch the seedlings. It is best not to apply fertilizer on the surface of the soil, but to dig trenches and bury them to improve fertilizer efficiency(98 cell propagation trays wholesale). Fertilizer should be applied 5 cm from the root to avoid watering the roots.
Water immediately after fertilization(plug trays). The water and fertilizer treatment in the lotus root period is a period in which the root system of Chinese cabbage is developed in a large amount and the leaves are rapidly developed. It is also the basic period for the formation of large leaf balls, so it is also a period of necessary water and fertilizer. At this time, it is also the epidemic period of downy mildew(flat plastic tray). Downy mildew requires two conditions: proper temperature and proper humidity.
(greenhouse plastic seedling tray manufacturers nz)Because the root system is shallower at the seedling stage, the base fertilizer effect is slower, and the young roots cannot be used in real time(black plastic plant pots). Although the temperature of the open space cannot be controlled, the humidity can be handled by controlling the watering. Therefore, care should be taken to avoid bud buds and bud steaming, especially in dry years(plastic grow pots). BT emulsion can be used before the third age, 3-4.5 kg per hectare, 750 kg of water, spray once every 7 days, even spray 2 times.
Therefore, the watering during the lotus seat should be properly controlled, and the soil can “see dry and wet”(gallon plant pot). In the middle of the lotus period, water can be poured once, and then a deep cultivation can be stopped. These are all traditional practices. In recent years, downy mildew has been largely controlled due to improvements in cultivation techniques(greenhouse supplies pots), such as the implementation of large-scale and small-scale operations and improvements in preventive measures.
Important diseases of Chinese cabbage include viral diseases, downy mildew, leukoplakia and soft rot(square nursery pots). Cold water in the seedling stage to prevent viral diseases, use 40l aluminum phosphate 300 times solution and 70l carbon dioxide 500 times solution to control downy mildew, use 25 times Ndazim 500 times solution or 70 times Kosher cloth to control white spot disease, use 150 ml / liter Streptomycin sulfate controls soft rot(wholesale greenhouse pots). The pests include striped flea beetles, aphids, cabbage caterpillars, cabbage thieves, and mantles.
(greenhouse plastic seedling tray manufacturers nz)Insecticides are applied in real time to prevent and control the damage formed by trichlorfon. Use 120 - 150 kg of fine powder or 90 times of chlorophenol solution per hectare(cell trays). At the seedling stage, attention was paid to the control of aphids, which were controlled with a 25% solution of 40% dimethoate emulsion(seed starter trays). During the growth period of Chinese cabbage, attention should also be paid to the control of cabbage caterpillars and cabbage night larvae.