Cabbage is one of the most commonly grown vegetables in the north and south of China. It uses the land on the basis of overcoming the spring and autumn, and increases the number of pakchoi planted in Yuci during the summer and fall seasons. First, varieties: According to the color of the petiole, there are two types of green and white. Qing Gang has Shanghai Qing Gang and Qingdao Qing Gang. It has strong cold resistance and good quality. White Gang has Nanjing White Gang and Jinan White Gang. The leaves are short, white and green, and the cold resistance is slightly inferior. Summer and autumn cultivation generally chooses heat-resistant and adaptable varieties. Second, the summer and autumn cultivation time: generally in May to early August can be sown at any time, about a month can be harvested young plants listed. Third, cultivation techniques: (1) selection. Select drainage well. Cool and ventilated place. Plough before the harvest and clean the pastoral field to reduce the risk of pests and diseases. (2) sowing. The summer and autumn are generally broadcasted, and harvesting is carried out in divided times. Generally, 1.5-2.0 kilograms are planted per acre. (3) Management. From sowing to harvesting, the demand for water and fertilizer for the entire growth period of Chinese cabbage is parallel to the growth of the plant. In the initial stage, the amount of growth was small and less fertilizer was required. In the middle stage of growth, the growth was prosperous. In combination with watering, the urea was traced once or twice, and the amount was 10-15 kg per mu. Combining potash spraying with potassium fertilizer to improve quality. (4) Harvest. During the vegetative growth period of Chinese cabbage, plants can be harvested and marketed as long as they are fresh regardless of their size. Due to the high temperature in summer and autumn, rapid growth and aging, attention should be paid to the timely picking of the market. (5) Pay attention to prevent pests and diseases. Summer and autumn virus disease, black rot, vitiligo, pay attention to drainage, with Virus Ling, Green Heng 2nd, agricultural resistance 120, streptomycin for agricultural prevention, virus disease mainly control aphids, drought prevention; insect pests, aphids, vegetable powder Discs, moths, can use high-efficiency Bt insecticides, Shennongbao, 0.26% matrine water to prevent.
Disposable Dental Micro Applicators,Dental Micro Brush Holder,Disposable Micro Applicators
Dental Radiography Co., Ltd. , http://www.nsdentals.com