Mr. Lee is a veteran vegetable grower in Hong Kong who has been growing vegetables for more than 10 years. But he has never been able to make the vegetables he grows grow well and produce high yields. Mr. Li is best at growing greens and cabbage, but every time he sees the same vegetables in his neighbor's house growing significantly better than his own, Mr. Li feels very puzzled and anxious. 
Later, Mr. Li figured out that the key to the problem was fertilization. He found himself Xi habit of using only a small amount of nitrogen fertilizer to fertilize and never change. The nutrient needs of vegetables at different stages are different, so it is difficult for mechanized fertilization methods to meet the growth needs of vegetables. For example, during the seed germination stage of green vegetables, a large amount of nitrogen fertilizer is needed to promote nitrogen absorption and help seeds germinate quicklyIn the middle and late stages of growth, phosphate fertilizer and potassium fertilizer are more needed to maintain normal growth. But Mr. Li has never fertilized according to this demand, so it is no wonder that the greens have not grown well. 
In addition, Mr. Li did not pay attention to the application of basal fertilizer. He usually sprinkles a little fertilizer at the time of sowing and rarely topdresses in the later stage. This leads to a chronic lack of soil fertility to provide adequate nutrients for vegetables. (1) Blind fertilization at the wrong time and at the wrong timeA common problem for many vegetable growers is that they do not match the use of fertilizer according to the characteristics of different growth cycles of vegetables, but blindly use a certain fertilizer. This leads to the problem of "wrong time, wrong time". For example, Ms. Wang grows tomatoes. She has only used phosphorus and potassium compound fertilizers, and never used nitrogen fertilizers, calcium fertilizers, etc. As everyone knows, nitrogen is particularly important for the growth of vegetables during the period from seed germination to flowering and fruitingIn the later stage of fruiting, calcium is more needed to promote fruit ripening. Ms. Wang's single fertilization method could not meet the nutritional needs of the tomatoes at different stages, which resulted in a low final yield of her tomatoes. 
2) Pay attention only to basal fertilizer at the seed stage and ignore the mailbox at each growth periodAnother common problem is that many growers only pay attention to the application of basal fertilizer, and ignore or reduce the top dressing that continues to supplement nutrients at each growth period. It's like a child who only has a baby period** and no longer eats when he grows up, and he will inevitably be stunted. This is the case with Mr. Zhang, a grower. He will first apply sufficient basal fertilizer when planting vegetables, but rarely continue to supplement fertility after the seedlings grow up. This leads to the rapid loss of soil nutrients, and the seedlings cannot obtain sufficient nutrients in the later stage of growth, and eventually the leaves are yellow, which affects the yield. (3) Not supplementing nitrogen fertilizer in the late growth stage, resulting in premature decay and yield reduction, there is also a problem for another type of grower, that is, ignoring the importance of continuing to add nitrogen fertilizer in the late growth stage. After many vegetables grow and bear fruit, if nitrogen fertilizer is not supplemented in time, there will be premature senescence and withering. That's the case with Ms. Zhao, a grower. The seedlings she planted grew well in the early stages, but in the later stages of growth, the leaves turned yellow and soft, affecting the yield. The root of the problem is that there is no continued supplementation with nitrogen, which is necessary to maintain leaf growth. This made Ms. Zhao feel very sorry. 
Through the above cases, it can be seen that if growers have misunderstandings in fertilization, it will seriously affect the normal growth and yield of vegetables. This verifies the true meaning of the phrase "if you don't understand these three points for fertilization, no matter how much you apply, it will be useless". (1) Early growth stage: the early stage of promoting the growth of roots and seeds germination vegetables, that is, from sowing to germination and initial growth, the development of root system and the successful germination of seeds during this period are particularly important. Reasonable basal fertilizer application can achieve the purpose of "promoting seedlings and strengthening roots". According to Wang Jun, a planting expert, the base fertilizer must be based on nitrogen fertilizer. Because nitrogen can enhance the germination force of seeds and promote the rapid growth of radicles, it is the best "seedling helper". In addition, the addition of fertilizers rich in organic matter and biological bacteria can also help improve the soil and make the root system more abundant and developed. 
A well-developed root system can provide sufficient water and nutrients for the later growth of seedlings. Just like a company, it must first establish a sound procurement and transportation system, and then the product manufacturing can continue to obtain raw materials. Therefore, the good application of basal fertilizer and the establishment of a sound root system are the first steps to the success of the whole vegetable life cycle. (2) Mid-growth: After ensuring comprehensive nutrition into the mid-growth stage, vegetables have more comprehensive and sufficient needs for various nutrients. Not only nitrogen fertilizer is needed to develop stems and leaves, but also potassium fertilizer and phosphate fertilizer are needed to promote flower and fruit fruiting, and trace elements such as calcium and zinc also play an important role. Li Xiaoqiang, a planting expert, said that many growers tend to overlook the importance of balanced fertilization in the middle of growth. For example, only nitrogen fertilizers are used, and other nutrients such as phosphorus and potassium are not added. 
As everyone knows, the lack of nitrogen, phosphorus and potassium during this period will limit the output, and sufficient balance must be ensured. It's like the human body has to consume a variety of nutrients such as proteins, fats, carbohydrates, etc., and a lack of any of them will affect health. Therefore, the fullness of flowers and fruits and the abundant yield in the medium term are all ensured by balanced fertilization. (3) Late growth: Supplementing nitrogen fertilizer to delay decayFinally, adding an appropriate amount of nitrogen fertilizer in the late growth stage can significantly delay aging. Otherwise, nitrogen deficiency will cause the leaves to turn yellow, which will affect the yield. It's like the aging of the human body and the need to continue to replenish nutrients to maintain body functions. Therefore, reasonable nitrogen fertilizer topdressing is one of the key measures to obtain abundant yields. (1) Promote the growth of vegetables and increase the yieldScientific and reasonable fertilization methods can significantly improve the growth quality of vegetables, make the leaves greener, the stalks thicker, and ultimately significantly improve the yield. 
It's like a child, if you eat a reasonable and balanced diet, you will be healthy and grow up quickly;Otherwise, growth will be stunted and the body will be weak. (2) Improving the soil, optimizing the planting environment, and rational fertilization can also increase soil fertility and provide a better growth environment by supplementing organic matter. It's like a home, you have to clean up and go out to buy food to be a good place to live;Otherwise, it will become more and more dirty and messy. Therefore, mastering scientific fertilization methods can be said to kill multiple birds with one stone, not only to greatly increase yields, but also to improve the soil, so that future longer-term planting can benefit. 
This is the core skill that every grower needs to focus on and is the key to a good harvest.