Purple cabbage cultivated in the open field in summer can be supplied to the market from August to September, regulating the summer season of vegetables and increasing the variety of colors. However, the growth of purple cabbage in summer is the hot and rainy season. The weeds are overgrown and the pests and diseases are serious. Therefore, it is necessary to choose varieties with early maturity, heat resistance and disease resistance, and management should pay attention to flood control, weeding and pest control. High economic efficiency.
Seeding seedling beds should be selected for plots with high topography and convenient irrigation and drainage, and simple brackets should be built to protect them from rain and rain. Fertilization before planting, usually seeding seedlings from mid-May to early June. After the seedlings are unearthed, the seedlings are suitable. In order to cultivate strong seedlings, the seedlings were once every 15 days after sowing, and the seedling distance was 5 cm x 5 cm. When the seedling age is about 30 days, 6 to 8 true leaves are ready for colonization.
Site-wide fertilization and cultivation of summer purple cabbage should choose a well-drained and ventilated plot, and apply more decomposed organic fertilizer as base fertilizer, and apply appropriate fertilizer. High ridge cultivation or sorghum cultivation can be used. The ridge planting is convenient for watering, and the sorghum cultivation is convenient for drainage and is not susceptible to damage. The method used should be based on local conditions, but the terrain should be maintained. Sorghum cultivation, 畦 wide 100 cm (with groove), groove width 30 ~ 40 cm.
Timely planting was planted in the middle and late June, with a row spacing of 50 cm and a plant spacing of 35-40 cm. For each two rows, the triangle is planted, and 3000-4000 plants are planted per acre. It is best to transplant the seedlings with soil, and plant the water in time to stabilize the seedlings. When planting, you should choose cloudy or sunny evening to prevent sun exposure, reduce dead seedlings and promote slow seedlings.
The field management is hot and rainy in summer, with strong sunlight and large evaporation. In order to ensure the normal growth of the plants, small water should be poured and the soil should be kept moist. After colonization, weeding and weeding 2 or 3 times. The cultivating should not be too deep to prevent water accumulation after the rain and hinder the growth of the roots. The high-humidity season is not conducive to plant growth, it is necessary to topdress early, promote early growth, early ball formation, in order to achieve early maturity and high yield. Generally, the rosette leaves are applied in the early stage of growth and in the beginning of the core period, and the fertilized human excrement is applied.
Under high temperature and high humidity conditions, summer purple cabbage is prone to major pests such as aphids, cabbage caterpillars, rapeseed meal and soft rot. It should be controlled in time, otherwise it will affect quality and yield.
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Elevator Traction Machine
While there is a wide range of elevators to fit every need, they fall under three basic types: machine-roomless, gearless traction and geared traction.
Traction elevators are the most common type of elevators. Elevator cars are pulled up by means of rolling steel ropes over a deeply grooved pulley, commonly called a sheave in the industry. The weight of the car is balanced by a counterweight. Sometimes two elevators are built so that their cars always move synchronously in opposite directions, and are each other's counterweight.
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