flowering? The fertilizer is in powder form
You will need to follow the instructions on the packaging, as well as know the feeding requirements of the specific plant in question.
Feeding rates can differ from brand to brand, depending on purity and proper storage.
As a general rule, you should start with half the recommended strength and work your way up, starting about 2 or 3 weeks before a plant starts to flower into maturity. Usually, this is mixed into water, as per the instructions. It is not usually safe to apply raw phosphate powders directly to the soil, like it is with a granular.
Basically, it all boils down to packaging instructions, and the individual plant's feeding habit.
Here is an article that will help you with superphosphate use: https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/what-is-superphosphate.htm
Fertilizer I bought says do not use on potted plants, even though it is for citrus.
I'm not sure why it would say that; our articles recommend fertilizing potted fruit trees.
You might try to call the manufacturer or the shop where you bought the product and ask for more information.
Does this method differ for plants in the ground?
You will be watering -with- the fertilization. Make sure to follow all packaging instructions regarding use. Usually, you will mix in a certain amount per gallon, or liter, whichever applies to you.
Application rates will be dependent on the type of fertilizers that you choose, as well as the specific type of plant.
Always make sure to water only after the ground dries fully, down to 3 or 4 inches, outdoors, and 2 and 3 inches, indoors. This will prevent root rot, or other issues.
Watering times will differ based on climate, and humidity around the area. It is best to measure by hand, or with a meter until you get comfortable with watering habits of your plants.
These articles will help: https://www.gardeningknowhow.com/category/garden-how-to/soil-fertilizers
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/best-times-to-apply-fertilizer.htm
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/what-is-balanced-fertilizer.htm
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/what-is-foliar-spray.htm
https://www.gardeningknowhow.com/houseplants/hpgen/watering-your-houseplants-properly.htm
https://www.gardeningknowhow.com/edible/vegetables/vgen/water-plants-vegetable-garden.htm
Wanting to learn how to mix plant foods properly to get the best results for my household plants, and the best plant foods; and can plant foods be mixed together? and what is p/h levels for
It is best to follow all instructions on the packaging. All foods will have different instruction, so it is important to use them accordingly.
Usually, you will not mix plant foods, unless you need to fulfill one of the 16 main nutrient requirements that is not contained in the food. In this case, you will need to figure out, exactly, how much is missing from your main food source in order to find out how much you will need to supplement from another.
Usually, this will not be necessary.
The pH of the soil will determine the ability of nutrient uptake. The pH need will vary slightly between most plants, but 6.5 to 7 is acceptable to most. Some plants require acidic soils, and some alkaline. This information will need to be obtained prior to planting.
nutrient levels will depend on the species of plant, also. Some plants are heavy feeders, and others will die with heavy feeding.
This article will offer more information: https://www.gardeningknowhow.com/houseplants/hpgen/feeding-and-repotting-your-houseplants.htm
Which application would use a 28-3-3 fertilizer. Just found a bag recently.
Since that is high in nitrogen (first number) you could use it on your lawn.
Or if the soil sample showed high rates of phosphorus and potassium (the next two numbers) already in a garden area, you could use it there.
https://www.gardeningknowhow.com/lawn-care/lgen/type-of-lawn-fertilizers.htm
I have seen people placing fish with corn and such..does it work or can it be harmful to plants?
I have heard of people placing whole fish in the soil, but we don't recommend it. Most fertilizing foods need to be composted or broken down into some form of plant food. Plus you will attract animals. Here's an article about what to compost:
https://www.gardeningknowhow.com/composting/ingredients/what-can-you-compost.htm
I am sorry for wrong post because I'm Turkish and I don't know english very much. My plants need to tsp and Potassium nitrate.But If potassium nitrate is used, calcium should not be used.And there is calcium in the tsp.Can I use potassium nitrate and TSP at the same time?
Are you making your own fertilizer? I would use a ready made fertilizer or add organic fertilizers such as compost instead.
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/what-is-balanced-fertilizer.htm
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/types-of-organic-fertilizer.htm