Alternate nitrogen amendments for organic fertilizers

Area of Science:

• Agricultural Science
• Environmental Science
• Soil Science

Background:

• Organic fertilizers like compost and manure are widely used in tropical developing countries, but often have low nitrogen content.
• Chemical nitrogen fertilizers are common but pose environmental risks, including nitrate leaching and eutrophication.
• Sustainable alternatives are needed to improve crop yields and reduce environmental impact.

Purpose of the Study:

• To evaluate Gliricidia sepium as a nitrogen source in organo-mineral fertilizer formulations.
• To determine the efficacy of amending compost with Gliricidia prunings for crop production.
• To assess the potential of this approach for small-scale farmers and environmental protection.

Main Methods:

• A sand culture experiment was conducted using Amaranthus caudatus as the test crop.
• Commercial compost was amended with 30% Gliricidia sepium prunings.
• Nutrient content of Gliricidia sepium was analyzed (3.8% N, 0.32% P, 1.8% K).

Main Results:

• Gliricidia sepium demonstrated a higher nitrogen content (3.8%) compared to typical composts (<1%).
• Amending compost with 30% Gliricidia prunings showed potential benefits for crop growth.
• The organo-mineral formulation offers a balanced nutrient profile.

Conclusions:

• Amending compost with Gliricidia sepium prunings is a viable strategy for small-scale farmers.
• This approach can improve nutrient availability for crops like Amaranthus caudatus.
• Utilizing Gliricidia sepium can help reduce reliance on chemical fertilizers and mitigate environmental pollution.