A season of winter vegetables read "fat medicine"
The snow has passed and the temperature in winter has been declining. Due to the rapid decline in temperature, the temperature in the greenhouse is extremely unbalanced with the external temperature. Therefore, during this period, greenhouse vegetable fertilization and pesticide use must be strictly observed. Many peasant friends often neglect the influence of temperature, pay attention to details when fertilizing, resulting in reduced fertilizer use efficiency, affecting the growth of shed vegetables; in the use of drugs, management is not comprehensive, resulting in the occurrence of phytotoxicity, hindering the growth of shed vegetables effect. In short, regardless of fertilization or medication in winter, we must consider the low-temperature elements to ensure that the shed has a good growing environment.
The fertilization chapter “Preventing Duties†Controls the Bureau of Fertilization
To prevent the application of nitrate nitrogen fertilizer nitrate-nitrogen fertilizer such as ammonium nitrate, potassium nitrate, etc., it is easy to accumulate nitrate in vegetables; it is also not suitable to use chlorinated fertilizer, chloride ions can reduce the content of vegetable starch and sugar, so that the quality of vegetables will be deteriorated and the yield will be reduced. , And chloride ions will remain in the greenhouse, which will lead to acidification of the soil, easily causing calcium deficiency in the soil. After potassium chloride, ammonium sulfate and other chemical fertilizers are applied to the soil, ammonia ions and acid ions are not easily absorbed and remain in the soil, which will increase the concentration of the soil solution and damage the normal growth of the crop. Therefore, greenhouses should use urea, ammonium phosphate, diammonium phosphate, superphosphate and special fertilizers.
Preventing the fertilization of vegetables under drought conditions is a happy crop. Fertilizing when the soil is dry, not only can the fertilizer effect not be fully exerted, but also the concentration of soil solution can suddenly increase, causing the roots of the vegetables to burn. Therefore, when fertilizing vegetables, they should be combined with irrigation, and they should be fertilized by drilling or applying fertilizer.
To prevent shallow fertilization greenhouses due to a better degree of confinement, shallow fertilization or spread fertilization materials, it is easy to make the fertilizer volatile, both to reduce fertilizer efficiency, but also easy to produce ammonia hazards. When topdressing, it is necessary to do acupuncture or application. The depth is 5 to 6 cm, and it is best to maintain a distance of 8 to 10 cm from the vegetable roots. This will reduce the accumulation of nitrates in vegetables and increase the utilization rate.
To prevent excessive fertilization in greenhouses, we must strictly follow the principle of “a small number of times†to prevent excessive fertilization. The limit of applying fertilizer to different soils per acre is as follows: urea does not exceed 0.6 kg per mu; 25 kg of diammonium phosphate sandy loam, 35 kg of clay and loam soil; 40 kg of superphosphate-based sandy loam, 50 kg of loam and clay. Once improper fertilization is found, when the harmful gas content in the greenhouse is too high, ventilators should be opened to ventilate when the temperature is high at noon to reduce the concentration of harmful gases so as to ensure the normal growth of vegetables.
Medication articles "Preventing problems", strict drug off
The amount of drug used can not be arbitrarily increased in the winter greenhouse is relatively closed, poor ventilation, increased humidity within the greenhouse, the disease occurs frequently, it is difficult to control. In this case, the measures adopted by vegetable farmers are to increase the dosage of pesticides. This situation has become more and more severe, which is the main reason for the high incidence of drug damage. Farmers need to change their understanding of the use of drugs. The emergence of resistance to pathogens is the main reason for the decrease in the use of pesticides. Increasing the dose of pesticides has a great influence on the growth of vegetables, and the disease-preventive effect is not obvious, especially when the temperature rises rapidly at noon in winter. The moisture in the medicament rapidly dissipates, and it is very easy to destroy the leaf tissue of the vegetable, causing the occurrence of phytotoxicity. Farmers should not blindly increase the amount of pharmaceuticals, they should constantly change their medicines, rotate their medications, and avoid drug resistance.
To use anthers in order to promote the flowering of fruits and vegetables, in addition to the use of plant growth regulators, we should also pay attention to strengthening the management of greenhouses, often wiping the greenhouse film, and strengthening the light; increase the cover of the greenhouse, strengthen the insulation, to avoid the night temperature Low; attention to weather changes when watering, so as not to happen when the low temperature water damage; adjust the greenhouse environment, increase plant growth, increase fruit setting rate, avoid blindly increase the concentration of anthers, causing poisoning.
Pay attention to the reasonable mixing of foliar fertilizer and pesticides. In order to improve the efficacy of medicines, many pharmaceutical agents on the market today are compounded pharmaceuticals containing multiple components. The foliar fertilizer contains a large number of metal ions, which are prone to chemical reactions in light of pesticides. It reduces the efficacy of the drug, causing it to cause injury. In winter, the ground temperature is low, and the fertilizer and water are not properly managed. It is very easy to cause root injury, resulting in the weakening of the plant's ability to absorb nutrients in the root system and reducing the resistance of the plant. In order to avoid this kind of phytotoxicity, it is necessary to pay attention to spray alone when spraying foliar fertilizer, or to do experiments when mixing foliar fertilizer to ensure that there will be no large-scale application when no phytotoxicity occurs. Http://Content/0c336237-0bca-4cf7-9bb9-2fde29f8301e?cType=2
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