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How to Spray Corn with Liquid Fertilizer

By Larry Parr ; Updated September 21, 2017

For the backyard gardener who's into vegetables, there are few things better than fresh-picked corn on the cob. But getting your corn to the stage at which it can be picked and eaten takes a lot of work and unless your corn has the right nutrients, the cobs may not fully form and your backyard cobs may turn out to be a bit of a disappointment. One way to increase your chances of a healthy corn harvest is to properly fertilize your crop, and one way to do that is to spray your corn with a good liquid fertilizer.

Purchase a liquid 4-3-3 corn fertilizer. The numbers refer to the proportion of nitrogen (N), phosphorous (P) and potassium (K). If you have a backyard garden that is under an acre in size, you will need approximately 1 gallon or slightly less.

Mix the liquid fertilizer with water as per the manufacturer's directions (approximately 30 gallons of water per 1 gallon of liquid fertilizer) and put the mixture in a sprayer.

Spray the leaves and stems of your corn plants when they are 4 to 6 inches tall. Spray on a non-windy day and do not spray if rain is expected within the next 24 hours, as rain will wash the fertilizer from the leaves before it has had a chance to be fully absorbed.

Spray the leaves and stems of your plants again when they are approximately 18 inches tall. Allow at least 10 days between sprayings.

Spray a third time if desired just as your corn plants are beginning to tassel.


Things You Will Need

  • Liquid corn fertilizer
  • Garden sprayer


  • Follow the manufacturer's instructions when mixing liquid fertilizer as each brand requires a slightly different concentration.
  • Liquid fertilizers are absorbed by the leaves and stems of the plants, not by their roots.


  • Do not water plants for 24 hours following the application of liquid fertilizer.

About the Author


Larry Parr has been a full-time professional freelance writer for more than 30 years. For 25 years he wrote cartoons for television, everything from "Smurfs" to "Spider-Man." Today Parr train dogs and write articles on a variety of topics for websites worldwide.