Managing Nutrients

Apply only those nutrients the plants can use.

with your local cooperative extension agent to help you understand soil test results, fertilizer recommendations, and how to correctly calibrate your spreader. Organic or conventional fertilizers usually provide primary plant nutrients (N-P-K), but plants require at least 10 other nutrients (called micronutrients). You can get a plant tissue test to determine if your plants need micronutrients. Apply only the nutrients needed according to soil test results. Never exceed the recommended rates and timing.

Fertilizing lawns

  • To avoid excess nitrogen in Hawaii’s waters, use slow-release nitrogen fertilizers. Consider using compost to enhance or replace fertilizers.
  • Leave grass clippings on the lawn for fertilizer.
  • Avoid using fertilizers that contain weed killer or insecticide. These chemicals should be used only when other more environmentally-friendly pest control options fail. Use them only on affected areas.
  • Be careful not to spread fertilizer on sidewalks and driveways.
  • Be sure to calibrate your spreader correctly.

Fertilizing gardens

  • Use compost to enhance or replace fertilizers.
  • Choose a level site, or terrace the garden, to avoid runoff and erosion.
  • Place fertilizer near plants rather than broadcast it over the entire garden.
  • Add organic matter to the soil by using manures and organic fertilizers at a conservative rate.

Additional Resources

 


Source: "Hawaii Backyard Conservation" (PDF), The U.S. Department of Agriculture.

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