In the spring season, when fertilizing in the greenhouse
Release time：2024-04-11 page views： Font size：big In the small
In spring, the indoor ground temperature and temperature of greenhouses gradually rise. At this time, vegetables are in a high temperature environment, and this is also a period when diseases and pests are frequent and prone. Therefore, greenhouse management at a critical time should pay more attention to fertilization. Which methods should be used for fertilization, which fertilizers are relatively important, and at the same time, what should be paid special attention to in fertilization? This issue of "Greenhouse Butler" focuses on fertilization management and tells you what should be paid attention to.
The method is scientific and promotes the comprehensive absorption of nutrients.
adopts a single-plant fertilization method to "open a small stove" for plants with weaker growth. The method is to water first, and fertilize a single plant when the water flow in the planting row is stable and the water does not seep down. This can improve the utilization rate of fertilizers and avoid waste.
Choose fertilizer according to plant growth. Nitrogen and potassium are balanced water-soluble fertilizers with high content, which can promote plant growth, promote fruit development, and balance plant growth. High-potassium water-soluble fertilizers can effectively promote nutrient transportation to fruits and increase yield.
Root-raising fertilizer, root joy, root like, etc. are fertilizers rich in amino acids, chitin and microbial agents, which can effectively improve the absorption capacity of roots; Suteng "Xinxiu" is rich in nitrogen, phosphorus, potassium and other elements and alginic acid organic matter; Shell Beijia water-soluble fertilizer, rich in chitin, can support roots and provide nutrients, which can significantly improve vegetable yield.
Ecological orchard, which helps shed vegetables to prevent cold and resist cold
Increase light, provide more sunlight for seedlings, and cover grass and other mulches as early as possible and at night within the temperature range that can maintain normal growth. Even on cloudy and rainy days, it should be uncovered. It is best to use a drip-free film or dust-proof film with high light transmittance, and often keep the film surface clean.
Control humidity. The humidity in the shed is too high, the water content in the seedlings is too high, and the concentration of cell fluid is low, which is prone to freezing damage. Due to the low temperature and weak light in spring, high humidity in the shed is also easy to induce diseases. In this regard, the seedling shed should strictly control the number and amount of watering, and strengthen ventilation when the humidity is too high. Ventilation should be carried out during the period with high temperature around noon to prevent the cold wind from blowing directly on the seedlings and causing freezing damage.
Scientific fertilization should not be applied to nitrogen fertilizer, so as not to reduce the cold resistance of seedlings. Increasing the application of potassium fertilizer can improve the cold resistance of seedlings. Spraying sweet and sour liquid on seedlings can increase the sugar content and hardness of leaf flesh, and can also improve the cold resistance.
Strengthen coverage. At night, the outside of the shed should be covered with thermal insulation materials such as quilts and grass tombs, and keep the covering in a dry state. The inside of the shed should be insulated by multi-layer covering methods such as hanging two-layer films and buckling small arch sheds. The North Face of the greenhouse can be stacked with straw to form a windbreak to keep out the wind and cold.
Apply with caution, beware of causing fertilizer damage
Do not apply cake fertilizer that is not decomposed, because the carbon and nitrogen ratio of cake fertilizer is small, the decomposition is fast, and it is easy to produce high temperature and high concentration of ammonia and organic acids locally, which is easy to burn roots. The cake fertilizer should be broken up, soaked in human feces and human urine for about 3 weeks, and then applied after high temperature fermentation.
Do not apply ammonium sulfate and ammonium carbonate. Ammonium sulfate is a physiological acidic fertilizer. After application, it will increase the acidity of the soil and damage the soil structure. Ammonium carbonate evaporates a lot of ammonia gas, which is not good for the growth of vegetables.
Do not apply chemical fertilizers containing chlorine. Chloride ions can reduce the starch and sugar content of vegetables, make the quality of vegetables deteriorate, reduce yield, and chloride ions remain in the soil, which can lead to soil acidification and easily cause soil decalcification
Do not fertilize under drought conditions. Vegetables are water-loving crops. Fertilizing when the soil is dry will not only fail to give full play to the fertilizer effect, but also suddenly increase the concentration of the soil solution, which is easy to cause vegetables to burn roots. Fertilization of vegetables should be combined with irrigation, open ditches for fertilization, bury the fertilizer tightly and then irrigation, or top-dressing along the water.
Do not apply more diammonium phosphate. Vegetables need a lot of nitrogen and potassium, and less phosphorus is required. Even if phosphorus fertilizer is applied, diammonium phosphate should not be mixed with alkaline fertilizers such as plant ash to avoid volatilization of ammonia and cause ammonia damage.
Do not apply iron fertilizers and rare earth fertilizers to the soil. Iron ions are easily fixed by the soil and converted into insoluble compounds, thus losing the fertilizer effect. Therefore, iron fertilizers should not be applied to the soil. Iron is not easy to flow on the leaves, foliar spraying should be used, 0.1%~ 0.3% ferrous sulfate solution can be evenly sprayed on the vegetable leaves, or 0.05%~ 0.07% rare earth micro-fertilizer solution sprayed on the vegetable leaves, spraying 50~ 60 kg of solution per mu. (Comprehensive)