Explanation:

Soil conservation is the prevention of soil from erosion or reduced fertility caused by overuse, acidification, salinization or other chemical soil contamination.
Use of Early Maturing Varieties
Early maturing varieties of crops take less time to mature and thus put lesser pressure on the soil. In this way it can help in reducing the soil erosion.
Contour Ploughing
If ploughing is done at right angles to the hill slope, the ridges and furrows break the flow of water down the hill.
This prevents excessive soil loss as gullies are less likely to develop and also reduce run-off so that plants receive more water.
Strip Cropping
Crops may be cultivated in alternate strips, parallel to one another. Some strips may be allowed to lie fallow while in others different crops may be sown.
Various crops are harvested at different intervals. This ensures that at no time of the year the entire area is left bare or exposed.
The tall growing crops act as wind breaks and the strips which are often parallel to the contours help in increasing water absorption by the soil by slowing down run off.
Crop Rotation
Adopting sustainable agricultural practices is the most important measure to conserve soil.
In many parts of India, a particular crop is sown in the same field year after year. This practice leads to exhaustion of certain nutrients in the soil making it infertile.
Crop rotation is a practice in which a different crop is cultivated on a piece of land each year.