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How to Give Nitrogen to Plants

All plants need nitrogen to thrive, but this essential element is constantly depleted from the soil. Some nitrogen is lost in runoff and leaching, and plants consume large quantities while they grow. Gardeners return nitrogen to the soil by fertilizing the plants. Most bagged fertilizers contain nitrogen. The percentage of nitrogen in a bagged fertilizer is expressed as a ratio, such as 20-5-10. The first number refers to the percentage of nitrogen, and the next two numbers refer to the amounts of phosphorous and potassium respectively. Natural fertilizers such as compost and rotted manure also contain large amounts of nitrogen.

Things You'll Need

  • Fertilizer
  • Hoe or shovel
  • Manure or compost
  • Cheesecloth
  • Large bucket or barrel
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Instructions

  1. Bagged Fertilizer

    • 1

      Spread the fertilizer evenly around the plants. Dumping it all in one place can damage the roots. Do not allow the fertilizer to come into direct contact with the foliage.

    • 2

      Scratch the fertilizer into the soil with a shovel or hoe. Be careful not to damage the plants' roots as you work.

    • 3

      Water lightly, applying only a quarter- to a half-inch of water to prevent runoff.

    Compost and Manure

    • 4

      Apply a few handfuls of compost or aged manure around the plants. Both compost and manure are rich in nitrogen, but the amount varies.

    • 5

      Take care not to allow manure to come into direct contact with the plants. Direct contact can burn the foliage.

    • 6

      Water lightly.

    Manure Tea

    • 7

      Place aged manure in the center of a piece of cheesecloth.

    • 8

      Pull up the sides of the cheesecloth, and tie a knot to enclose the manure.

    • 9

      Suspend the bag in a large bucket or barrel of water, and leave it overnight.

    • 10

      Remove the bag, and dilute the liquid to the consistency of pale tea.

    • 11

      Use the diluted liquid to drench the soil around the plants.