Khadar soils are found in flood plains. Let's break down the answer and explain it in detail.

Flood Plains:
Flood plains are flat or gently sloping areas adjacent to rivers or streams. They are formed by the deposition of sediments carried by the flowing water during floods. Flood plains are characterized by their fertile soils, which are essential for agriculture.

Khadar Soils:
Khadar soils are a type of alluvial soil found in flood plains. Alluvial soils are formed by the deposition of fine particles such as silt, clay, and sand carried by rivers and streams. Khadar soils are younger and more fertile compared to older alluvial soils known as bhangar.

Characteristics of Khadar Soils:

1. Fertility: Khadar soils are highly fertile due to their composition. They contain a good amount of organic matter and essential nutrients required for plant growth.

2. Texture: These soils have a fine texture with a good percentage of silt and clay particles. The presence of clay helps in water retention and nutrient absorption, making them suitable for agriculture.

3. Moisture Retention: Khadar soils have a high moisture-holding capacity, which is beneficial for crops during dry periods. This characteristic ensures a continuous water supply to plants.

4. Nutrient Content: These soils are rich in nutrients like nitrogen, phosphorus, and potassium. The deposition of sediments during floods replenishes the nutrient content of the soil, making it highly fertile.

5. Alkalinity: Khadar soils are generally slightly alkaline in nature, which means they have a pH higher than 7. This alkalinity is conducive to the growth of a wide range of crops.

Conclusion:
In conclusion, Khadar soils are found in flood plains. These soils are fertile, have a fine texture, retain moisture well, and are rich in nutrients. They provide an ideal environment for agricultural activities and support the growth of various crops.