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The main purpose of combining coarse fertilizer with fine fertilizer is to combine the slow effect of coarse fertilizer with the quick effect and high efficiency of fine fertilizer, so that vegetables can get sufficient nutrition supply during the whole cultivation period, and at the same time, improve the soil structure and improve the soil production capacity. Under normal conditions, repeat the operation several times. Contact the laboratory for sampling and analysis. If the hydrocarbon content in the tank is less than 1.5%, it is qualified.
At present, the seedling substrate is mainly cultivated into a pile, injected with disinfectant, and then covered tightly with plastic film. After fumigation for 7 days, it is spread out and dried for 7-10 days, and then used for seedling cultivation after releasing the residual disinfectant. The side and bottom of the seedling bowl for Soilless Seedling Raising are provided with many holes, which contain substrates. They are placed in a nutrient solution tray 1-2 cm deep for seedling raising. The roots of vegetable seedlings protrude from the holes into the nutrient solution to absorb nutrients.
Generally, peat, vermiculite and coal cinder with good ventilation, strong water holding capacity, compact texture and good root protection effect shall be selected as the seedling medium and mixed Soilless Seedling medium, among which peat is the best. At the same time, the water holding capacity and cation exchange capacity of peat are high, and the ventilation is good. When used for seedling cultivation, the substrate is not easy to disperse, and the effect of root protection is good. It is the most ideal substrate for seedling cultivation.
Due to the small bulk density of peat and the high acidity (pH less than 4) when peat is used alone, the seedling tray is mainly used to mix peat and vermiculite in the ratio of 2:1 before seedling cultivation. When used alone for seedling cultivation, 4-7kg dolomite powder should be added to each cubic meter of peat to reduce the acidity. Disinfection treatment of seedling substrate in order to avoid seedling disease caused by substrate carrier, the substrate should be disinfected before seedling cultivation.
In addition, steam is introduced into the box to keep the substrate at a high temperature of 70-90 ℃ for 1 hour, and the substrate is sterilized and exterminated by high temperature. The main agents for disinfection are formalin, chloropicrin, bromomethane, etc. Sunlight disinfection this disinfection method is to use the principle of "high temperature and closed shed" to cultivate the matrix into a strip pile with a height of about 20cm in the greenhouse or greenhouse, spray water properly to keep it moist, cover it with plastic film, and expose it to the sun for about 1 week.
This disinfection method is troublesome, and most of the disinfectants are toxic to the human body. At present, there are not many applications. During the operation, the gas-solid contact between nitrogen and polypropylene powder is not very uniform, and the propylene adsorbed by the polypropylene powder under normal pressure cannot be completely replaced. The flashing is carried out alternately by vacuum pumping and nitrogen filling, which can reduce the residual hydrocarbon content in the powder, accelerate the flashing speed and ensure the product quality. Start the vacuum pump on site.
The concentration of nutrient solution should be properly increased, and the amount of fertilizer used should be increased by about 20% in a timely manner. The seedling bowl is mainly used to cultivate seedlings for soilless cultivation of vegetables. In addition to disinfecting the seedling substrate and seeds according to the regulations, it is also necessary to regularly spray the bed surface with carbendazim, chlorothalonil and Prozac for protection from the beginning of seedling emergence. The first two numbers in the seedling hole specifications indicate the length and width of the seedling hole, and the last number indicates the depth of the seedling hole.
The seedling tray is a plastic tray with many regularly arranged seedling pits (similar in shape to ordinary seedling cups and bowls) pressed by hard plastic. The size of the seedling pits ranges from 1.5cm × 1.5 cm × 2.5 cm to 5 cm × 5cm × 5.5 cm. During flash replacement, it is forbidden to use the replacement method of filling N2 while venting, which will cause N2 "short circuit" and incomplete replacement, and also waste nitrogen, which is easy to cause accidents.
Therefore, according to the size and number of seedling raising holes, seedling raising plates can be divided into 72 hole plates, 128 hole plates, 200 hole plates and so on. The seedling tray can be irrigated with nutrient solution or put into the nutrient solution, and the nutrient solution can be infiltrated into the bowl from the hole at the bottom of the seedling hole. The nutrient solution management is flexible. The activator flows into the raw silk scale or metering tank of the refined N2 pipeline, and the activator flows into the refined N2 pipeline from the opened or leaked refined nitrogen valve.
