Importance of Chalky Soil for Agriculture

What is Chalky Soil?

Chalky soil, also known as alkaline soil, is composed primarily of calcium carbonate (lime) and tends to have a high pH. It is often stony or compact and is typically found in areas with a lot of chalk or limestone. While it is not as fertile as other soil types, it can support certain crops when managed properly. Chalky soil often has good drainage but may require amendments to improve its fertility for some plants.

Importance of Chalky Soil

• Good Drainage: Chalky soil drains well, which can prevent waterlogging and root diseases.
• Alkaline Nature: The high pH of chalky soil benefits plants that prefer alkaline conditions.
• Improves Aeration: Chalky soil is well-aerated, promoting healthy root growth.
• Requires Amendments: Organic matter or acidic fertilizers may be needed for optimal growth.

Minimum Nutrient Levels and pH of Chalky Soil

Chalky soils typically have the following characteristics:

• pH Level: 7.5 to 8.5
• Nutrient Levels: Low in nitrogen, phosphorus, and potassium
• Drainage and Texture: Stony and free-draining

Common Crops Grown in Chalky Soil

Indian Crops

Crop	NPK Requirements	pH Range
Wheat	N: 120 kg/ha, P: 60 kg/ha, K: 40 kg/ha	6.0 - 7.5
Rice	N: 100 kg/ha, P: 50 kg/ha, K: 50 kg/ha	6.5 - 7.5
Mustard	N: 80 kg/ha, P: 40 kg/ha, K: 40 kg/ha	6.0 - 7.5
Chickpea	N: 20 kg/ha, P: 60 kg/ha, K: 40 kg/ha	6.0 - 7.0

Foreign Crops

Crop	NPK Requirements	pH Range
Lavender	N: 40 kg/ha, P: 30 kg/ha, K: 30 kg/ha	6.5 - 8.0
Sweetcorn	N: 150 kg/ha, P: 80 kg/ha, K: 60 kg/ha	6.0 - 7.0
Peas	N: 20 kg/ha, P: 50 kg/ha, K: 40 kg/ha	6.0 - 7.5
Sunflower	N: 120 kg/ha, P: 60 kg/ha, K: 60 kg/ha	6.0 - 7.5