What to do when the white part of scallions is short, thin, and hollow? Control measures and integrated management

1. Select excellent long-white scallion varieties, such as Zhangqiu scallion, grain scallion (whip-pole scallion), etc.

2. Choose a plot with deep soil, fertile texture, and good drainage, and carry out deep plowing and fine harrowing; generally plow deeper than 30 cm, dig 20-30 cm deep, 15-30 cm wide or more, with ridges 70-80 cm wide between furrows to facilitate earthing up. Before planting, open furrows and apply fertilizer, applying 1000-5000 kg of farmyard manure per mu, then subsoil the furrows deeply so that manure and soil are combined.

3. Plant between Grain in Ear and Minor Heat; earlier is better than later. If planted too late, the formation period of the white part is short, so the white part will be short and thin and the yield low; at the same time, the seedlings tend to grow leggy, and after planting the hot weather makes it difficult for them to recover.

4. When planting scallions, plant deep and cover shallowly, so that soil can be earthed up in stages later. Generally, the plant spacing is 1 cm, and the soil cover is about 8 cm, with the standard being not to bury the heart leaf of the scallion seedling. Before planting, select the scallion seedlings, choosing seedlings with stems about 1 cm thick, 3-4 leaves, 30-40 cm tall, and free of pests and diseases.

5. Strengthen cultivation management. From after planting to before Start of Autumn is the seedling recovery and summering period. In the semi-dormant state, intertillage should be strengthened to conserve soil moisture and promote root development; if the soil is not dry, it is best not to water. From after Start of Autumn to before White Dew, the plants enter the peak leafing period. From about late August to late September, fertilizer and water management should be strengthened, applying 15 kg of urea per mu; after topdressing, soil should be earthed up, earthed up, and irrigated in time. After White Dew, the plants enter the white-part growth period; fertilization should mainly use quick-acting nitrogen fertilizer, and watering should be frequent and heavy, keeping the soil moist often to meet the needs of white-part growth.

6. Combine intertillage with earthing up. Before the rainy season arrives, slightly earth up the furrows onto the ridge platform to prevent water accumulation in the planting furrows from causing root and stem rot. After Start of Autumn, earth up once every 10-15 days. Earthing up is an effective measure to increase the length of the white part, for a total of 3-4 times. The first time should be shallow earthing up to raise soil temperature; the latter two times should involve more earthing up, especially the last time, which should be earthed up as high as possible without exceeding the heart leaf.

7. When the heart leaf stops growing, 15-20 days before the soil freezes is the suitable harvest period; generally harvest from Frost's Descent to Start of Winter.