Agrochemicals: Application Methods on Crops

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What Are Agrochemicals? कृषि रसायन क्या हैं?

Agrochemicals play a crucial role in modern agriculture by protecting crops from pests, diseases, and weeds, and by improving crop productivity. However, indiscriminate use can harm human health, soil fertility, water resources, and beneficial organisms. Therefore, understanding their types, correct usage, and safety measures is essential for sustainable farming. Agrochemicals are chemical substances used in agriculture to:

• Control pests, diseases, and weeds
• Enhance crop growth and yield
• Protect harvested produce

They are commonly used in crop production, storage, and post-harvest management.

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Types of Agrochemicals कृषि रसायनों के प्रकार

Fertilizers उर्वरक

Used to supply essential nutrients like Nitrogen (N), Phosphorus (P), and Potassium (K).

Examples:

• Urea
• DAP
• MOP
• NPK mixtures

Purpose:

• Promote plant growth
• Increase yield

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Pesticides कीटनाशक

Chemicals used to control insects, diseases, weeds, rodents, and nematodes.

a) Insecticides – Control insects

b) Fungicides – Control fungal diseases

c) Herbicides (Weedicides) – Control weeds

d) Rodenticides – Control rats and rodents

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Plant Growth Regulators (PGRs) पादप वृद्धि नियामक

Used to regulate flowering, fruiting, and plant growth.

Examples:

• Gibberellic acid
• NAA
• Ethrel

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Fumigants धूमन रसायन

Used mainly in stored grains and soil treatment.

Examples:

• Aluminium phosphide
• Methyl bromide (restricted)

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Need for Safe and Judicious Use of Agrochemicals

कृषि रसायनों के सुरक्षित एवं विवेकपूर्ण उपयोग की आवश्यकता

Excessive and improper use leads to:

• Pest resistance
• Residues in food
• Soil and water pollution
• Health hazards to farmers and consumers

Hence, balanced and responsible use is necessary.

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Principles of Safe and Judicious Use सुरक्षित एवं विवेकपूर्ण उपयोग के सिद्धांत

🌿 1. Use Recommended Dose Only अनुशंसित मात्रा का ही प्रयोग करें

• Never exceed the prescribed dosage
• Follow label instructions

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🌿 2. Right Chemical at Right Time सही समय पर सही रसायन का प्रयोग

• Spray at economic threshold level (ETL)
• Avoid calendar-based spraying

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🌿 3. Adopt Integrated Pest Management (IPM) एकीकृत कीट प्रबंधन अपनाएं

• Combine cultural, biological, mechanical, and chemical methods
• Chemicals should be the last option

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🌿 4. Use Protective Equipment सुरक्षा उपकरणों का प्रयोग करें

• Gloves, mask, goggles, long clothing
• Avoid spraying against wind

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🌿 5. Safe Storage and Disposal सुरक्षित भंडारण एवं निपटान

• Store away from food and children
• Do not reuse pesticide containers

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Methods of Agrochemical Application कृषि रसायनों के प्रयोग की विधियाँ

Method	Description
Seed treatment	Chemical coating on seeds
Soil application	Mixed with soil before or after sowing
Foliar spray	Sprayed on leaves
Drip / fertigation	Applied through irrigation
Dusting	Dry powder application
Fumigation	Gas treatment in storage

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Crop-wise Pesticide Recommendation Table फसलवार कीटनाशक अनुशंसा तालिका

Crop	Major Pest / Disease	Recommended Pesticide	Dose / Method
Rice	Stem borer	Chlorantraniliprole	150 ml/ha spray
	Brown planthopper	Imidacloprid	100 ml/ha
Wheat	Aphids	Thiamethoxam	100 g/ha
	Loose smut	Carboxin (Seed treatment)	2 g/kg seed
Cotton	Bollworm	Emamectin benzoate	220 g/ha
	Whitefly	Flonicamid	200 g/ha
Maize	Fall armyworm	Spinetoram	180 ml/ha
Pulses	Pod borer	Indoxacarb	500 ml/ha
Vegetables	Fruit borer	Spinosad	150 ml/ha
Sugarcane	Early shoot borer	Chlorpyriphos	Soil application
Oilseeds	Aphids	Dimethoate	1 ml/litre

⚠️ Always follow state agriculture department recommendations.

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Environmental and Health Considerations पर्यावरण एवं स्वास्थ्य संबंधी सावधानियाँ

• Observe waiting period before harvest
• Avoid spraying near water bodies
• Promote bio-pesticides and organic inputs

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Conclusion

Agrochemicals are powerful tools in crop protection and productivity, but their misuse can cause serious environmental and health problems. By adopting safe, judicious, and need-based use, along with IPM practices, farmers can ensure sustainable agriculture and food safety.

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