Farmers can provide nitrogen to crops through various sources, categorized as organic and inorganic:
Organic Sources
1. Animal Manure: A natural source rich in nitrogen and other nutrients.
2. Compost: Decayed organic matter that slowly releases nitrogen into the soil.
3. Green Manure: Crops like legumes fix atmospheric nitrogen, enriching the soil.
Inorganic Sources
1. Nitrogen-Based Fertilizers: Common fertilizers include urea, ammonium nitrate, and ammonium sulfate.
2. Nitrates in Soil: Naturally occurring nitrates are available for plant uptake.
3. Synthetic Additives: Controlled-release fertilizers provide nitrogen over an extended period.
