Scallions Miaotian over the summer management points
Shanghai Scallion cultivation area of ​​200hm (square) as much. In recent years, in addition to serving as a condiment for fresh food, dehydration processing of chives has also been carried out, which has greatly stimulated the rapid development of chives production and has emerged in many professional production villages. Chives can be produced in four seasons, but the production is mainly in the spring and autumn. In the hot summer season, the focus of production is to make the transplanted chives seedlings safer over the summer so that seedling transplanting can be carried out in mid-August. During this period of time, it is necessary to strengthen management in the following five aspects: 1. Before planting soil, it is best to use beans and melons. The soil must be deep-rooted and dried. It is necessary to make drainage and irrigation convenient and rain to dry. 1 mu of pre-transplanted farmyard manure 300kg and ternary compound fertilizer 50kg as base fertilizer before transplanting. Second, the appropriate shallow planting spring and autumn planting scallions general planting depth of 4-5cm, its purpose is to increase light blue length, increase production and product quality. However, during summers, heavy rains are often encountered, and the soil is easily hardened. If the planting is too deep, the bottom roots will have poor permeability, resulting in poor growth and even light blue rot. Therefore, when planting seedlings, 3-4 roots should be planted in each cluster, and the depth should be 2-3cm, and the density should be kept at 5cmx5cm. 3. The optimum temperature for the growth and delivery of sheltering chives is around 25 degrees, and the exposed temperature in summer is often as high as 40 degrees or above, which seriously affects the normal growth of chives. For this purpose, shade nets must be used. This can be a cooling down 3-5 degrees; Second, less evaporation, to maintain soil moisture; Third, prevent heavy rain and rain on the direct flushing of the surface, thus effectively reducing the degree of surface consolidation. Fourth, the small water ground scallion root system is not well-developed, shallow distribution, water absorption capacity is weak, neither drought nor impatient. Therefore, we must adhere to a small water supply during drought, and it is generally required to be carried out before 8 o'clock in the morning. Therefore, when the temperature of water and soil is constant, if the water temperature is high at noon, the temperature difference between water and soil is too large, and the chives are not suitable for physiological conditions. Disease. V. Diseases and Insect Control Diseases of chives include gray mold and disease. The commonly used agents are: 60% saponin aluminum phosphorus wettable powder 500 times liquid, 64% antivirus WP wetted powder 600 times. Insect pests mainly include: green onions, onion thrips, the former can be used 20% chlorine horse EC 200.