Amaranth is the main green and light green leafy vegetable in summer and autumn. It is in high temperature and high humidity environment, and it is not tolerant of low temperature. In case of frost, the stem and leaf are dead. The optimal temperature for growth is 25-30°C, and the growth is stagnant below 10°C. In winter, it is necessary to adopt greenhouse insulation cultivation. Variety selection choose suitable for local planting varieties of leeks, such as big bone blue, flag leaves, big chicken green and so on. Land fertilization and cultivation of leeks is fast, with strong branching ability, and requires more fertilizer and water, and basal fertilizer should be applied. Generally, 2500-3000 kg of organic fertilizer per mu, 100 kg of vegetation ash, mixed with the soil to make wolfberry, pod height 20 cm, width 130-150 cm seed treatment seed leeks thick and hard, direct seeding germination slower, In case of continuous low temperature and rainy weather, seeds are perishable, and germination is required before sowing. First soaking in warm water at 30°C for 18-20 hours, then wrap it in gauze and place it in 30°C germination box. More than 50% seeds can be sown. Sowing planting leeks using greenhouses can achieve annual production and annual supply. The sowing season for winter cultivation can be listed from October to January, December and December to March of the following year. Spreading, drilling can be used, the amount of 1.5 to 2 kg per mu. Spread 1 cm thick fine soil after spreading. Drilling can be done in the shallow surface of 2 to 3 cm deep ditch, groove 15 cm, the seeds evenly sprinkled in the ditch, and then covered with fine soil. After the broadcast, the surface was covered with shade nets, drenched with water, and the shade nets were removed after emergence. Temperature and humidity management In the winter, greenhouses are cultivated using greenhouses. The temperature inside the greenhouse is low and the humidity is high. In case of prolonged periods of low temperature and rain, it is not conducive to plant growth and development. After the sowing, the greenhouse shall be sealed to ensure that the greenhouse temperature is higher than 10°C to prevent freezing damage, but the temperature should not be higher than 35°C to prevent the occurrence of diseases. When the humidity in the booth is high, the film ventilation at both ends or around the greenhouse should be promptly opened under the conditions of sufficient sunlight and high temperature. The fertilizer and water management leeks can be harvested many times, and in addition to the application of base fertilizers, fertilizers should be applied in multiple stages. Seedlings can be applied per acre 10% to 15% of diluted human excrement 1000 to 1500 kg; when the seedlings have 3 to 4 true leaves, 45% per acre compound fertilizer 15 to 20 kg, urea 3 to 4 kg; The collection period is 1 time per harvest, and 5 to 8 kg of compound fertilizer is applied per mu. Leeks need a lot of water, they should always be watered to keep the ground moist. Pest control diseases mainly include seedling stage damping-off disease and stalk rot. Most of them are caused by low temperature and high humidity. Decreasing the humidity in the greenhouse can reduce the disease. 64% of the available antivirus crickets can be found in the early stage of disease.
Mn-Zn wettable powder 500 times or 70% mancozeb wettable powder 500 times spray control. The pests are mainly maggots such as red spider, which can be sprayed with a spray of 1000 times of 73% propargite EC.
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