There are quite a lot of fertilizers for feeding flowers and plants. They are available in liquid and powder form. And the instructions usually indicate how much fertilizer should be taken for a certain volume of water. But only the volumes of water for irrigation, the capacity of watering cans and bottles are different for all of us. For example, I water plants from one and a half liter plastic bottles, my friend from five liter and two liter bottles - it is more convenient for her. Liquid fertilizers are easier to measure and calculate for the required amount of water, but with powdered fertilizers (usually a fine-crystalline powder), it is more difficult. The fact is that not everyone has electronic scales with an accuracy of 1 g. The concept of "a tablespoon with a top" is also very subjective. And to be too clever with fertilizers, pouring "by eye", is very dangerous for plant health.
Therefore, I will try to tell you how I calculate the dose of fertilizers for my flowers.
The most common fertilizer I have is "Fertika Lux" - a pink fine-crystalline powder, rather hygroscopic. Sold in bags weighing 20 g. According to the manufacturer's statement, this is one tablespoon. To clarify, if you pour the contents of the package into a tablespoon, there will be a heaped tablespoon.
20 g of fertilizer (1 sachet) Fertika Lux are designed for 10 liters of water. My flowers will not drink so much at a time, and not everyone needs to feed it with this fertilizer, so I dilute 1.5 liters of solution.
First, I pour all the fertilizer into a measuring cup to find out approximately its volume. It is about 22 ml.
For more accurate metering of fertilizers, I have a 20 ml syringe, from which the front wall with the tip is cut off.
I put the fertilizer into the syringe, quite tightly, I have to press it lightly with a stick, but without effort. The capacity of the syringe is just the required 22 ml.
I make a simple calculation: 22 ml of fertilizer is designed for 1 liter of water, respectively, 3.3 ml of fertilizer is needed for 1.5 liters of water. But, I take strictly 3 ml - it's better not to get enough than to go too far.
And now I pour the resulting handful of fertilizer into a teaspoon (it turned out not complete and without a slide), which I will use exclusively for chemicals. You can use any medicine scoop. The more accurately the volume of the spoon fits, the better.
In exactly the same way, you can calculate any other powdery or crystalline fertilizer for any volume of water. The main thing to remember is that the fertilizer solution should stand a little (about 1 hour), so that the crystals are completely dissolved, it is better to shake it periodically. Well, and the most elementary rules for fertilizing plants: you cannot water with a fertilizer solution on dry soil, you cannot feed sick and weakened plants, as well as those at rest. Doses of top dressing in universal fertilizers are usually averaged, for some plants you need to take a lower concentration of fertilizer (half or a quarter), so carefully read the recommendations for plant care. This primarily applies to bromeliads, ferns, orchids and some other flowers.