What do the 4 numbers on fertilizer mean?

What do the 4 numbers on fertilizer mean?

EUGENE – When you see numbers following a fertilizer name, they correspond to the percentage of those elements – N, P and K – nitrogen, phosphorus and potassium.

What does NPK written on a bag of fertilizer mean?

These three numbers form what is called the fertilizer’s N-P-K ratio — the proportion of three plant nutrients in order: nitrogen (N), phosphorus (P) and potassium (K). The product’s N-P-K numbers reflect each nutrient’s percentage by weight.

What is NPK value?

The NPK value indicates how much nitrogen, phosphorus and potassium there is in your substrate or fertiliser. These three essential macronutrients are needed by all plants. Knowing the NPK value of your soil and fertiliser helps you give the right amount of nutrients to your plants.

What is the difference between NPK 19 and 20?

NPK represents Nitrogen (N), Phosphorus (P), and Potassium (K) and the numbers like 20-20-20 or 19-19-19 means the concentration of these elements in the fertilizer. 20-20-20 fertilizer has a 1-1-1 ratio. 19-19-19 fertilizer has a 1-1-1 ratio. 15-30-15 fertilizer has a 1-2-1 ratio.

How do you calculate fertilizer blends?

To determine a fertilizer ratio for a recommendation of 1.5 lb of nitrogen, 0.5 lb of phosphate, and 0.5 lb of potash, divide the weight of each of the three nutrients (1.5 lb, 0.5 lb, 0.5 lb) by the nutrient with the lowest weight (0.5 lb). Thus, the fertilizer ratio that best fits this recommendation is 3-1-1.

How do you calculate fertilizer?

To determine the fertilizer rate for a particular nutrient, multiply the rate of the desired nutrient by 100 and divide by the percentage of the nutrient in the fertilizer.

How do you calculate NPK fertilizer?

To calculate the pounds of nitrogen in a bag of fertilizer, multiply the weight of the bag by the percent nitrogen (this is the first number in the N-P-K designation on the front of the bag). This will tell you the pounds of nitrogen in the bag.

What is a good NPK ratio?

Studies have found that the ideal NPK fertilizer ratio of those nutrients for flowering plants is 3-1-2. (That’s 3% Nitrogen, 1% phosphorus & 2% potassium.) So look for that ratio on the label of packaged fertilizers; anything close to a 3-1-2, a 6-2-4 or a 9-3-6 should be ideal.