Timing and Dangers of Overuse of Potassium Dihydrogen Phosphate
Main text core guide: Understanding potassium dihydrogen phosphate fertilizer and whether to apply phosphorus and potassium fertilizers after the coloring of rose flower buds, let's learn about it together.
Recently, many flower friends have asked: "The buds of the roses have colored, can I still use potassium dihydrogen phosphate? Many bloggers say that excessive use of potassium dihydrogen phosphate can lead to a shorter blooming period. Is that true? I'm纠结 whether to use it or not."
Potassium dihydrogen phosphate is a commonly used water-soluble phosphorus and potassium fertilizer and one of the ingredients in many water-soluble fertilizers. It is generally used to promote flowering and strengthen roots in home flower cultivation. Some flower friends say that the flowering effect is very good after using it, while others say that their roses did not grow after using potassium dihydrogen phosphate. Why is there such a big difference?
Understanding Potassium Dihydrogen Phosphate Fertilizer
Maybe everyone is more familiar with Huaduo No. 1 and No. 2, knowing that Huaduo No. 1 is a general growth fertilizer and Huaduo No. 2 is a flowering fertilizer. Why is there a functional difference between No. 1 and No. 2? Here we need to look at the effective ingredients.
In Huaduo No. 1 fertilizer, the ratio of nitrogen, phosphorus, and potassium is 1:1:1, which is very balanced. In Huaduo No. 2, the ratio of nitrogen, phosphorus, and potassium is 1:3:2. It can be clearly seen that the content of phosphorus and potassium is significantly higher. The main function of phosphorus and potassium fertilizers is to strengthen roots, promote root absorption, and promote bud growth, so Huaduo No. 2 is a flowering fertilizer. What does this have to do with potassium dihydrogen phosphate?
Simply put, potassium dihydrogen phosphate is one of the raw materials for making water-soluble fertilizers such as Huaduo. If the nitrogen element in Huaduo No. 2 is removed, it is roughly equal to potassium dihydrogen phosphate.
The Timing of Potassium Dihydrogen Phosphate Use and the Hazards of Overuse
In the entire growth period of plants, a large amount of nitrogen, phosphorus, and potassium fertilizers are needed. In the vegetative growth period of plants, that is, the stage of growing branches and leaves, more nitrogen fertilizers are needed, of course, phosphorus and potassium fertilizers are also needed. Therefore, before the flower buds grow, a balanced growth fertilizer containing nitrogen, phosphorus, and potassium is generally used.
Some flower friends may wonder, isn't more nitrogen fertilizer needed at this time? Shouldn't high-nitrogen fertilizer be used? Why use a balanced fertilizer? Because nitrogen fertilizer promotes the rapid growth of branches and leaves, the plant is prone to grow tall, and we not only want to control the height of the pot but also hope that the pot can bloom early, so using a balanced fertilizer of nitrogen, phosphorus, and potassium will be better.
Of course, if it is a very small seedling and you want the seedling to grow fast, using some high-nitrogen fertilizer is also fine. Fertilizers themselves are not good or bad, the key is the timing of use.
When the pot begins to grow flower buds, a "large amount" of phosphorus and potassium fertilizers need to be used because孕育ing flower buds requires more nutrients, and these nutrients need to be absorbed by the roots. Potassium dihydrogen phosphate can promote the strength of the roots, enhance absorption capacity, and provide more sufficient nutrients for the growth of flower buds.
But it should be noted that the "large amount of use" mentioned here is also relative, and it does not mean that once the flower buds start to grow, potassium dihydrogen phosphate is watered with a solution of 100 times or 200 times. As the saying goes, you can't become fat overnight, but you can overeat. Flower friends say that after their roses are watered with potassium dihydrogen phosphate, they do not grow, which is actually a phenomenon of fertilizer damage.
In addition to promoting flowering and strengthening roots, potassium dihydrogen phosphate also has a function of controlling vigorous growth. To achieve the effect of controlling vigorous growth, a high concentration of potassium dihydrogen phosphate needs to be used, such as a 200-fold concentration. When used to promote flowering, a concentration of 500-1000 is generally used. This concentration difference can be adjusted according to needs.
Let's take an example:
Like roses, when they grow flower buds, their branches continue to grow taller, and the necks under the flowers also stretch. If we use 1000 times the concentration of potassium dihydrogen phosphate, then during the bud formation stage, the branches of the roses may grow as high as they should. But if we use 500 concentration, it will have a certain controlling effect. The focus of rose growth will be on the flower buds, and the growth of the branches and the "neck" under the flowers will be less, thereby making the overall flowering height shorter.
Therefore, experienced flower friends will use potassium dihydrogen phosphate to control the height in advance when raising some rose varieties that are prone to drooping, to reduce the phenomenon of flower drooping.
Of course, it is not that the more phosphorus and potassium fertilizers the better. The key to correct use is still the timing and concentration.
Can Potassium and Phosphorus Fertilizers Continue to Be Used After the Coloring of Rose Buds? Will It Shorten the Blooming Period?
In mid-April, some rose buds have begun to show color, and many flower friends begin to worry that continuing to use potassium dihydrogen phosphate will lead to a shorter blooming period. In fact, stopping fertilization too early is the root cause of the short blooming period of roses.
Roses are almost multi-headed in spring, with several flower buds on one branch. The earliest flowering varieties have already begun to show color or even bloom. But if fertilization is stopped at this time, it is very likely that after the middle-sized flower bud blooms, the smallest flower bud will wither because it does not get sufficient nutrients.
The petals of the rose flowers also continue to grow during the blooming process and consume nutrients. Stopping fertilization too early will result in insufficient nutrients for the later flower buds, which can easily cause the flower buds to wither. Therefore, it is recommended to maintain the frequency of applying phosphorus and potassium fertilizers before the smallest flower bud shows color, which will be more beneficial to extend the blooming period.
Moreover, by observing the growth of roses, I found that roses that continue to be fertilized with phosphorus and potassium during the bud formation stage and blooming period not only have a good flowering degree of flower buds but also have better resistance and recover faster. Even when the flowers on the top of the branches have not withered, new branches have already grown and continue to grow flower buds.
Therefore, for potted roses, as long as not continuously applying a very high concentration of potassium dihydrogen phosphate for a long time, there is basically no problem of excessive phosphorus and potassium fertilizers, even if fertilized every day. Of course, stopping fertilization or reducing the fertilization frequency during the full blooming period is also possible. After all, having worked hard all year round, it's time to enjoy this wonderful moment.
For flowers like hydrangeas, which bloom once a year and have a consistent flowering period, stopping fertilization after the buds show color is completely fine. After all, such varieties that bloom only once a year do not require a lot of fertilizer, and there is also fertilizer in the potting soil. When the buds show color, you can stop fertilization and enjoy the flowers, and then supplement the fertilizer after the flowers.
The above content about understanding potassium dihydrogen phosphate fertilizer, the timing of potassium dihydrogen phosphate use and the hazards of overuse, and whether potassium and phosphorus fertilizers can continue to be used after the coloring of rose buds and whether it will shorten the blooming period is provided for everyone's reference.