Introduction
Agrochemicals are substances that, when properly applied, help manage agricultural ecosystems, protect crops, and boost productivity. They play a key role in preventing or reducing the impact of pests, diseases, and unwanted ecological elements that can affect food production.
Globally, the use of agrochemicals has significantly increased crop yields, but misuse can lead to health risks and environmental degradation. Understanding types, proper application rates, and timing is critical for safe and effective use.
The main categories of agrochemicals include:
- Fertilizers
- Pesticides (Herbicides, Insecticides, Fungicides, Rodenticides, Disinfectants)

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Fertilizers
Fertilizers provide crops with essential nutrients for growth and higher yields. They can be:
- Synthetic/Chemical Fertilizers: Manufactured with precise nutrient ratios
- Organic Fertilizers: Derived from compost, animal manure, and decaying vegetation
Most fertilizers supply Nitrogen (N), Phosphorus (P), and Potassium (K)—nutrients essential for plant growth. Fertilizers can be applied as:
- Granules or powders: Spread on soil and watered in
- Liquid fertilizers: Diluted in water and applied through drip irrigation or sprinklers
- Slow-release forms: Pellets, spikes, or briquettes placed near plant roots
Globally, about 152 million tons of fertilizers are used annually, highlighting their importance in food production.
Pesticides
A pesticide is any substance used to kill, repel, or control pests, including insects, weeds, fungi, or rodents. Pesticides are categorized according to the pest they target:
- Herbicides – control weeds
- Insecticides – control harmful insects
- Fungicides – prevent fungal growth
- Rodenticides – control rats and mice
- Disinfectants – prevent bacterial contamination
Globally, 2–3 billion kilograms of pesticides are used each year, showing their significance in modern agriculture.

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Herbicides
Herbicides are chemical tools for controlling unwanted plants in crop fields. They can be classified by:
1. Site of Action
- Contact Herbicides: Kill only plant parts touched by the chemical
- Systemic Herbicides: Absorbed by roots or leaves, killing the plant from within
2. Selectivity
- Selective Herbicides: Kill weeds without harming crops
- Non-Selective Herbicides: Kill all plants in the treated area
3. Application Timing
- Pre-Emergence: Applied before weeds emerge to prevent germination
- Post-Emergence: Applied on existing weeds at any growth stage

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Examples of Herbicides
| Type | Active Ingredient | Crop | Dosage |
|---|---|---|---|
| Atrazine 80 WP | 800g/kg Atrazine | Maize, Yam, Cassava | 4kg/ha |
| Glyphosate 480 SL | 480g/l Glyphosate | Arable & Plantation Crops | 4–8 l/ha |
| Paraquat Dichloride 200 SL | 200g/l | Arable & Plantation Crops | 3–5 l/ha |
| Butachlor 600 EC | 600g/l | Rice, Groundnut, Cowpea | 4 l/ha |
| Nicosulfuron 75 WG | 750g/kg | Maize | 100 g/ha |
Insecticides
Insecticides control pests that damage crops. Examples include:
| Name | Active Ingredient | Target | Dosage |
|---|---|---|---|
| Shooter 1000 EC | Dichlorvos 1000g/l | Stored produce, field insects | As directed |
| Cypermethrin 10 EC | 100g/l | Cotton, Cowpea, Vegetables | 1 l/ha |
| Imidacloprid 350 SC | 350g/l | Leafhoppers, Aphids | 0.5–1 l/ha |
| Termistar 480 EC | Chlorpyrifos 480g/l | Termites, Soil pests | 1–21 l/ha |
| Emamectin Benzoate 5.7 WG | 57 g/kg | Cotton bollworms, leaf worms | 200 g/ha |
Fungicides
Fungicides prevent fungal diseases that can destroy crops:
| Name | Active Ingredient | Target | Dosage |
|---|---|---|---|
| Cuprous Oxide 75 WG | 86% Cuprous Oxide | Black pod (Cocoa) | 800 g/ha |
| Granite Plus 66 WP | 60% Cuprous Oxide + 6% Metalaxyl-M | Cocoa, Coffee, Tea | 500–600 g/ha |
| Granite 74 WP | 60% Cuprous Oxide + 14% Metalaxyl | Cocoa | 800 g/ha |
Seed Treatment Chemicals
Seed treatment protects crops from soil pests and diseases:
- All Star 40 DS: Contains Metalaxyl and Imidacloprid
- Dose: 10 g/3–4 kg of seed depending on crop (maize, rice, sorghum, groundnut, cowpea)
Benefits:
- Ensures healthy crop establishment
- Reduces early-season pest and disease losses
- Improves yield and profitability
Best Practices for Agrochemical Use
- Always read the label and follow recommended rates
- Wear protective clothing when handling chemicals
- Apply chemicals during calm, dry weather
- Store agrochemicals in a secure, ventilated place
- Avoid mixing incompatible chemicals
Investment Opportunity
Agrochemicals are high-demand products in Nigeria due to the growing agricultural sector. Investors can:
- Establish distribution businesses for fertilizers and pesticides
- Import or manufacture herbicides, insecticides, and fungicides locally
- Provide advisory services and training on safe agrochemical use
The increasing need for safe, effective crop protection products ensures a profitable market for entrepreneurs willing to invest in Nigeria’s agrochemical sector.
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