Uncle Li is a well-known local vegetable farmer, and the vegetables he grows have always been of high quality and high price. For many years, Uncle Li has adhered to the style of "real materials" and is deeply trusted by consumers. Over the years, Uncle Li has sown leafy vegetable seeds in the ground as usual, thinking that leafy vegetables are easy to grow anyway, just sit back and wait for harvesting. 
This year, however, things are a little different. Uncle Li found that the lettuce, spinach, and oily wheat cabbage he planted repeatedly appeared long and weak, and the color was not as bright as in previous years. "What's going on?Uncle Li muttered to himself puzzled. He carefully inspected the vegetable garden in the field and soon found the root cause of the problem - because he accidentally sowed more seeds in order to ensure the sowing density, which caused the seedlings to be too close to each other, which seriously affected the normal growth. Uncle Li flipped through the records and compared the sowing data of the past few years. Sure enough, this year, thanks to about 20% more seeds, the average plant spacing was nearly twice as short as in previous years. After this blow, Uncle Li suddenly realized the regularity of planting leafy vegetables, and decided to solve the problem from the interval. After a detailed investigation, Uncle Li found that different leafy vegetable varieties have different plant spacings and seedling spacing due to different plant sizes. 
Compared with open large-spaced vegetables, celery and cauliflower with small plant spacing are more likely to be over-dense. As a rule of thumb, this type of leafy vegetable is best spaced for the first time when it grows into 2-3 true leaves, ensuring that there is a 3-5 cm gap between each plant to prevent the appearance of elongated strips in the later stage. When 2 true leaves grow, the second seedling can be carried out, and the row spacing of the basic stereotyped plants can be carried out. For lettuce, dandelion, etc., which are open and medium-sized, it is best to adjust the plant spacing to about 10 cm for the first time after 3-4 true leaves appear. When the fourth and fifth true leaves are generated, they are spaced again to obtain a final plant spacing of 15-20 cm, so that there is plenty of room for growth. 
Finally, for cabbage and spinach with large sorghum plants, Uncle Li recommends transplanting seedlings, or selecting the best seats after hole sowing and growth, so as to fundamentally ensure sufficient distance between plants and prevent intensive competition. Uncle Li emphasized that if you want to optimize the growth quality of leafy vegetables through seedlings, it is not enough to adjust the plant spacing, and the water and fertilizer management in the later stage is equally important. For the first time, the seedlings are still delicate and delicate, so there is basically no need for additional management, and it is enough to check and confirm the loosening of the surrounding soil. However, the second time, especially after planting seedlings, is very different, when the leafy vegetables enter a period of rapid growth and have a great demand for nutrients. At this time, it is necessary to water and top dressing on time to ensure that the roots, stems and leaves receive sufficient nutrients to achieve the best growth results. 
Specifically, after planting, the residual nitrogen fertilizer should be applied in time, and 5-8 kg of urea per mu or the same amount of ammonium sulfate should be supplemented, and it should be added again within ten days, which can effectively promote nitrogen absorption and make leafy vegetables grow rapidly. At the same time, phosphorus and potassium fertilizer solutions (such as superphosphate) are configured for irrigation to supplement PK, improve root system and enhance resistance. The data shows that the yield of leafy vegetables can be increased by up to 18% with this combined fertilizer solution. Uncle Li walked into the vegetable garden with a relieved expression, looked at the vibrant greenery, and confidently planned a bumper harvest day. During the interview, Uncle Li showed us in detail the quality comparison of the two batches of leafy vegetables before and after taking the seedlings. 
In a vegetable field in front of the seedlings, lettuce and lettuce are crowded with plant spacing, and the leaves are delicate and the color is relatively dull. In the vegetable field next door after two seedlings, the leaf area of the same kind of vegetables has increased significantly, the color is full and bright, and each plant can support a large plastic plate. "This gap is clear at a glance, and the importance of seedlings is self-evident. Uncle Li said with a smile. Uncle Li carefully recorded and counted the growth indicators and outputs of the two batches, which indeed confirmed the value of the seedlings - the average weight per plant of leafy vegetables after planting increased by 30%, and the final yield per mu also increased by about 15%. "This is a new method of planting that is both environmentally friendly and efficient, and I call on vegetable farmers to master it. Uncle Li's face was filled with the joy of harvest. 
At the end, Uncle Li said to us sincerely: "After so many years of growing vegetables, it still can't be compared with scientific strategies, and in the future, I will strengthen my learning Xi, rely on mature and stable planting programs to protect every green life, and give back to consumers."