Organic Fertilisers to Use This Month

Introduction

Mid-summer is a critical time for maintaining soil fertility. As your vegetables, fruits, and ornamentals surge into full growth, nutrient demands peak. Applying the right organic fertilisers this month ensures continued vigour, higher yields, and improved resilience against pests and diseases. Unlike synthetic feeds that can cause salt buildup or nutrient imbalances, organic amendments work in harmony with soil biology—feeding plants while building long‐term soil health.

In this guide, you’ll discover:

• How to assess soil nutrient needs in July
• Top organic fertiliser types and their benefits
• Application methods and timing for each fertiliser
• Tips for safe, effective use to avoid over‐feeding
• Sustainable strategies like green manures and mulches

Read on to choose the best organic fertilisers for this month’s garden tasks and keep your plot thriving through summer and into autumn.

1. Assessing Soil Nutrient Needs

Before applying any fertiliser, understand what your soil requires:

1. Soil Testing:
   • Purchase a DIY soil test kit or send samples to a lab.
   • Check levels of nitrogen (N), phosphorus (P), potassium (K), pH, and key micronutrients.
2. Visual Indicators:
   • Nitrogen Deficiency: Older leaves turn pale green or yellow and stunted growth.
   • Phosphorus Deficiency: Purpling of leaf veins, slow maturity.
   • Potassium Deficiency: Brown scorching on leaf margins, weak stems.
3. Crop-Specific Needs:
   • Heavy Feeders: Tomatoes, courgettes, cabbages require higher N and K.
   • Light Feeders: Herbs and bulb onions thrive on lower rates.

Armed with this information, you can target fertiliser applications for maximum effect.

2. Compost and Compost Tea

2.1 Well‐Rotted Compost

• Benefits: Balanced macro- and micronutrients, improves soil structure, feeds soil microbes.
• Application:
  • Spread a 2–3 cm layer around plant bases, taking care not to bury stems.
  • Gently fork into the top 5–10 cm of soil to integrate.
• Timing: Early July and again mid‐month to top‐dress beds and replenishing beds used earlier.

2.2 Aerated Compost Tea

• Benefits: Soluble nutrients, microbial inoculant, beneficial for foliar feeding.
• Preparation:
  • In a clean bucket, mix 1 part compost to 10 parts water.
  • Aerate with an aquarium pump for 24–36 hours, straining before use.
• Application:
  • Apply as a soil drench or foliar spray early morning or late afternoon.
  • Repeat every 2–3 weeks for sustained microbial activity.

3. Farmyard and Poultry Manures

3.1 Well‐Rotted Farmyard Manure

• Benefits: Slow‐release nutrients, organic matter boost, improves moisture retention.
• Application:
  • Spread a 3–5 cm layer under summer crops at the beginning of the month.
  • Work lightly into the soil surface to avoid runoff.

3.2 Chicken Manure Pellets

• Benefits: High nitrogen content (3–4% N), plus P and K; easy to apply.
• Application:
  • Broadcast 50–75 g per m² around vegetables.
  • Water in well to activate nutrient release.
• Caution:
  • Avoid fresh manure directly on plants to prevent “burn.”
  • Wear gloves and wash hands after handling.

4. Liquid Feeds: Seaweed and Fish Emulsion

4.1 Seaweed Extract

• Benefits: Rich in trace elements (iodine, zinc, iron), natural growth regulators, improves stress tolerance.
• Application:
  • Dilute 1:100 (10 ml per litre of water) and apply fortnightly as a soil drench or foliar feed.

4.2 Fish Emulsion

• Benefits: Fast-acting source of N, P, K; strong fishy odour dissipates in hours.
• Application:
  • Dilute 1:50 (20 ml per litre of water); apply every 10–14 days.
  • Use sparingly on young seedlings to avoid ammonia damage.

5. Alfalfa Meal and Pellets

• Benefits: Natural source of triacontanol (a plant growth stimulant), balanced N-P-K (2-1-2), organic matter.
• Application:
  • Meal: Broadcast 1–2 kg per 10 m² and fork in before or after planting.
  • Pellets: Place a handful (100–150 g) around the drip line of fruiting crops; water in well.
• Timing: Apply at start of month and mid‐July for continuous growth stimulation.

6. Mineral Amendments: Bone Meal, Blood Meal & Rock Phosphate

6.1 Blood Meal

• Benefits: High nitrogen (12–14% N), quick foliage boost.
• Application:
  • Sprinkle 25–50 g per m² around leafy vegetables; incorporate lightly into soil.
  • Water immediately to reduce odour and volatilisation.

6.2 Bone Meal

• Benefits: Slow‐release phosphorus (20–30% P₂O₅), supports root development and flowering.
• Application:
  • Mix 50–75 g per m² into planting holes for tomatoes, peppers, and brassicas.
• Note: Most effective in slightly acidic soils (pH 6.0–7.0).

6.3 Rock Phosphate

• Benefits: Phosphorus source for established beds, also supplies calcium and trace minerals.
• Application:
  • Broadcast 100–200 g per m² and fork into the top 15 cm of soil; best applied a few weeks before planting.

7. Worm Castings and Vermicompost

• Benefits: Highly available nutrients, beneficial microorganisms, enhances soil tilth.
• Application:
  • Top‐dress: 1–2 cm layer around seedlings and transplant plug plants.
  • Soil Drench: Steep 1 part castings in 5 parts water overnight; strain and pour around bases.
• Timing: Use weekly on high‐value crops like tomatoes and peppers for continuous microbial support.

8. Green Manures and Cover Crop Mulches

8.1 Summer Green Manures

• Options: Buckwheat, phacelia, crimson clover sown early July.
• Benefits: Rapid biomass production, nitrogen fixation (with clover), weed suppression.
• Application:
  • Sow in vacated beds; cut down at flowering and incorporate into soil 2–3 weeks before next sowing.

8.2 Mulch from Cover Crops

• Method: Mow or scythe fast‐growing mustard or oats, leaving a 10 cm stubble; use as a mulch on adjacent beds.
• Benefits: Conserves moisture, feeds soil fauna as it decomposes.

9. Wood Ash and Lime

9.1 Wood Ash

• Benefits: Supplies potassium (4–7% K₂O), calcium carbonate (raises pH), trace elements.
• Application:
  • Broadcast 100–150 g per m² on acid‐loving crops like brassicas; lightly rake in.
• Caution: Monitor soil pH to avoid over‐liming.

9.2 Agricultural Lime

• Benefits: Adjusts pH upward, improving nutrient availability in acidic soils.
• Application:
  • Apply at 250–500 g per m² in early July if soil pH is below 6.0; incorporate well and water.

10. Specialized Organic Blends

• Balanced NPK Mixes: Specialty granular or pelletised blends (e.g., 4-4-4, 5-5-5) tailored for vegetables.
• Application:
  • Follow label rates (often 50–100 g per m²) broadcast around growing plants; fork or water in.
• Advantages: Simplifies feeding schedule when multiple deficiencies exist.

Conclusion

July’s warm weather accelerates plant growth—and depletes soil nutrients rapidly. By choosing the right organic fertilisers this month, you provide essential macro- and micronutrients in a gentle, soil-building manner. From compost teas and manures to mineral amendments and green manures, each option plays a role in sustaining vigour, enhancing yields, and nurturing soil health. Apply fertilisers judiciously—guided by soil tests and visual cues—and integrate mulches and cover crops for lasting benefits. With these organic strategies, your garden will thrive now and build resilience for seasons to come. Happy summer feeding!

Top 10 Questions and Answers

1. How often should I apply organic fertilisers in July?
   Generally, every 2–4 weeks depending on the type: liquid feeds biweekly, granular meals monthly, compost top‐dressing mid‐month.
2. Can I mix different organic fertilisers together?
   Yes—as long as you follow recommended rates for each. For example, a side‐dress of compost plus a light dusting of blood meal can be combined.
3. Will organic fertilisers burn my plants?
   Fresh manures and high‐nitrogen meals (blood, fish) can scorch roots if over‐applied or unwatered—always water in and avoid contact with stems.
4. What’s the best way to apply compost tea?
   Strain before use, apply as a soil drench or foliar spray early morning, and repeat every 2–3 weeks for microbial boost.
5. Is wood ash safe for all crops?
   It’s high in potassium and calcium; best for brassicas and fruiting vegetables—avoid on acid‐loving plants like blueberries.
6. How do I know if my soil needs lime?
   Conduct a soil pH test. If pH is below 6.0, apply agricultural lime; re‐test after 6–8 weeks before re‐applying.
7. Can I use green manures in midsummer beds?
   Yes—buckwheat and crimson clover establish in 4–6 weeks; sow early July, cut at flowering, and incorporate mid‐August.
8. Are worm castings better than compost?
   Castings have higher concentrations of available nutrients and microbes, making them ideal for top‐dressing or teas.
9. What’s the difference between bone meal and rock phosphate?
   Both supply phosphorus, but rock phosphate releases slowly over months; bone meal works faster but still slower than synthetic P.
10. How do I store organic fertilisers?
    Keep dry, cool, and sealed in labelled containers. Manures and meals should be used within a year to maintain nutrient potency.