The N-P-K Ratio. Together, the three nutrients are the basis of the N-P-K ratio number listed on a fertilizer bag. The N-P-K set of numbers refers to the exact ratio or weight of Nitrogen (N), Phosphorous (P) and Potassium (K) that is present in a specific bag or container of fertilizer. As an example, a 5-5-5 set of numbers on a fertilizer bag The 25-pound bag of granules feeds up to 2,500 square feet of lawn as fertilizer, or up to 1,250 square feet of coverage for weed prevention. Its ultrasafe ingredients list means that children and Nevertheless, it is known that these type of fertilizers are eco-friendly with not easily determine NPK concentrations consecutively. Consequently, here are some fertilizer mixtures that you could use. This includes the following; Fish Emulsion and Liquid Fish. Fish emulsion isa good source of fertilizer with NPK ratio of 5-2-2. The ratio between the big three is often referred to as N-P-K (Nitrogen-Phosphorus-Potassium), where the number of each is the percentage used in the product. The remaining amount consists of micronutrients and other fillers. All-purpose, balanced fertilizer blends like 10-10-10 are easy to find and do a good job of keeping most plants happy. Hoss Complete Organic Fertilizer is the best watermelon fertilizer for administering calcium to the plant's roots. This granular fertilizer contains 9% calcium, which helps your plants produce the healthiest watermelons. This granular fertilizer has an NPK ratio of 5-5-2, which means it has a great source of nitrogen. If you need some Step 2. Prepare your orchid fertilizer as per the manufacturer's instructions. Most water-soluble orchid fertilizers require 1/2 to 1 tsp of granules to 1 gallon of water or 1/2 to 1 cap of liquid concentrate to 1 gallon of water. Remember, it's always better to under-fertilize so use sparingly. Step 3. Use fertilizer specifically designed for grass for the best results. The N-P-K indicates the percentage by weight of each of these three nutrients. For example, a common type of all-purpose fertilizer is referred to as 10-10-10. That means the bag contains an N-P-K ratio of 10 percent nitrogen, 10 percent phosphorous and 10 percent potassium. The higher the number, the more nitrogen the fertilizer provides. This is why most lawn fertilizers are high in nitrogen, with formulations like 24-4-12 or 20-2-6. Phosphorus (P) promotes root development, which helps to anchor and strengthen plants. It also increases bloom and fruit production. Nitrogen This helps a plant put on lush, green growth and helps break down organic matter in compost. Plants that lack nitrogen grow slowly, with small leaves and little top growth. Some things to know about nitrogen: Fertilizer Balance. Generally, fertilizer has an "NPK" number on the front of the container. The NPK number consists of three numbers, with each representing the concentration of nitrogen, phosphorus, and potassium, hence the name.. For the right formula for onions, you want to choose a mix that's high in nitrogen. G7mN02m.