1. The first requirement in the production of any crop is to see that soil conditions are as close to the optimum as possible. Barley prefers well-drained soils, light to medium in texture with a high pH

Inorganic fertilizers (Mineral Fertilizer)

Examples of naturally-occurring inorganic fertilizers include Chilean sodium nitrate, mined "rock phosphate" and limestone (a calcium source, but mostly used to reduce soil acidity).
Examples of manufactured or chemically-synthesized inorganic fertilizers include ammonium nitrate, potassium sulfate, and superphosphate, or triple superphosphate.
ROTATIONS
A rotation is a succession of crops usually fixed in a certain definite order. Nowadays rotations are not so fixed as before. To meet the changing conditions and the needs of the market, new crops can be introduced into rotations changes made when and where needed.
The opposite of rotation is to grow one crop year after year. This is known as monoculture and can lead to troubles, particularly disease. The one crop which can be grown this way is grass; permanent grass, if farmed properly, can be productive for a long time.

“Uses and Care of Soils” tekstni o‘qib chiqib, quyidagi gaplarni “T-jadvali” ga qo‘yib chiqing.

1. The economic value of crop rotation. 2. Properties determining the agricultural quality of soils. 3. Crop rotation. 4. The results of improper soil use. 5. The importance of proper care of the soil.