Organic Fertilizers for Certified Production: Sources, Ratios, and pH Management

Certified organic farming requires approved nutrient sources and careful soil management.

Approved Organic Fertilizers

• Animal-based: Bone meal, blood meal, composted manures.
• Plant-based: Cottonseed meal (acidifying), alfalfa pellets, cracked corn.
• Mined minerals (allowed): Sulfate of potash, rock phosphate, gypsum.
• Caution: Biosolids (water treatment byproducts) may contain heavy metals—verify certification status.

Building Balanced Nutrition

Organic fertilizers are single-nutrient dominant. Blend to achieve target ratios:

• Vegetables/roots: 1-2-2 (e.g., combine blood meal N + bone meal P + sulfate of potash K).
• Grains: Higher nitrogen ratio.

pH Uniformity

• Thorough tillage distributes amendments evenly.
• Test via composite samples (multiple cores across field).
• Most crops prefer 6.0–6.8; research each crop's specific range.

Practical Steps

1. List planned crops.
2. Research conventional fertilizer recommendations.
3. Source organic equivalents for each nutrient.
4. Consider pelleted blends (Espoma) for convenience vs. bulk raw materials for cost.