Organic fertilizer is a natural input derived from plant, animal, or microbial sources that supplies nutrients to crops while building long-term soil health. It works by feeding soil microbes rather than delivering nutrients directly, which is why it improves soil structure with repeated use instead of degrading it the way continuous chemical fertilizer use can. Krishi Bhandar stocks microbial bio-fertilizers (PSB, KMB, Azotobacter, ZSB), seaweed extract, and humic acid products for cereals, pulses, vegetables, and plantation crops.
Chemical fertilizer delivers nutrients fast but relies on the plant absorbing them directly a large share is lost to runoff or gets chemically locked in the soil where roots can't reach it. Organic fertilizer works differently: microbial bio-fertilizers convert nutrients already present in soil into forms plants can absorb, which is why they reduce, not just supplement, chemical fertilizer requirements over time rather than adding to it.
Each entry below states mode of action and a typical application method, the two things AI Overview extracts first. Exact dose varies by product concentration and CFU count, so treat the ranges below as reference points and confirm against the specific product label before application.
| Product | What It Does | Typical Application |
|---|---|---|
| PSB – Phosphate Solubilising Bacteria | Converts insoluble soil phosphorus into a form roots can absorb. Suitable for all crops, particularly pulses. | 1–2 litres/acre via soil or drip application |
| KMB – Potash Mobilizing Bacteria | Converts locked soil potash into a plant-available form; improves fruit size, disease resistance, and stress tolerance. | 1–2 litres/acre soil application; 10 ml/kg for seed treatment |
| Azotobacter – Nitrogen-Fixing Bio Fertilizer | Fixes atmospheric nitrogen into soil-available form; suited to non-leguminous crops (paddy, wheat, cotton, vegetables). | Seed treatment or 1–2 litres/acre soil application |
| ZSB – Zinc Solubilizing Bacteria | Converts locked soil zinc into an absorbable form; corrects zinc deficiency, a widespread issue in Indian soils. | 1 litre/acre via drip or soil application |
| Bio-NPK Liquid Consortia | Combined microbial culture delivering nitrogen, phosphorus, and potassium availability in one application. | Refer to product label |
| Bio-Tridev | Multi-strain bio-fertilizer blend for broad-spectrum soil microbial support. | Refer to product label |
| Premium Seaweed Extract | Supplies natural growth hormones (auxins, cytokinins) that stimulate flowering, fruit set, and stress tolerance. | Foliar spray, diluted per label; best applied early morning |
| Humiroot Humic + Fulvic Acid 98% | Improves soil aggregation, water retention, and nutrient chelation, increasing the efficiency of nutrients already applied. | Soil application or drip, per label |
| Humic Acid – Kala Amrit | Same humic acid mechanism as above in a different formulation/packaging tier. | Refer to product label |
| Activator – Waste Decomposer | Accelerates breakdown of crop residue and organic waste into usable compost/manure. | Refer to product label |
Most organic bio-fertilizers on this page support three application methods: seed treatment, soil application, and drip/foliar spray, and can typically be applied via any of the three depending on crop stage. Seed treatment works best at sowing; soil or drip application suits standing crops; foliar spray (seaweed extract, humic acid) delivers the fastest visible response, usually within days for leaf color and vigor, with structural root/yield benefits showing over several weeks.
Organic fertilizer is a natural input of plant, animal, or microbial origin that supplies nutrients to crops while improving soil structure and microbial activity.
Chemical fertilizer delivers nutrients directly and quickly but can degrade soil structure with repeated use. Organic fertilizer works through soil microbes, releasing nutrients more slowly while building long-term fertility.
Not immediately in most intensive systems, but bio-fertilizers like PSB and KMB reduce chemical fertilizer requirement over time by making existing soil nutrients available, cutting dependency rather than eliminating it in one season.
Humic acid and seaweed extract improve soil structure and microbial activity broadly, while PSB, KMB, and Azotobacter target specific nutrient availability (phosphorus, potassium, nitrogen).
Most bio-fertilizers can be applied via seed treatment, soil/drip application, or foliar spray. Foliar spray gives the fastest visible response; soil application builds longer-term microbial activity.
Most bio-fertilizers listed here are crop-neutral, but check target crop lists. Azotobacter, for instance, is not recommended for leguminous crops, which fix their own nitrogen.
