To answer the question "Which deals with establishment, growth and reproduction of timber trees?", we can analyze the options provided:
1. **Afforestation**: This term refers to the process of planting trees in an area where there was no previous tree cover. While it involves planting trees, it does not specifically focus on the growth and reproduction of timber trees.
2. **Silviculture**: This is the practice that specifically deals with the establishment, growth, and reproduction of trees, particularly timber trees. It encompasses the management of forested areas for timber production, making it the most relevant option in this context.
3. **Horticulture**: This field focuses on the cultivation of garden plants, including fruits, vegetables, and ornamental plants. It does not pertain to timber trees specifically.
4. **Agroforestry**: This involves integrating trees and shrubs into agricultural systems, combining them with crops and livestock. While it includes trees, it does not specifically focus on the growth and reproduction of timber trees.
Based on this analysis, the correct answer is **Silviculture** (option 2), as it directly relates to the establishment, growth, and reproduction of timber trees.
### Step-by-Step Solution:
1. **Identify the options**: Afforestation, Silviculture, Horticulture, Agroforestry.
2. **Analyze each option**:
- Afforestation: Planting trees, not specific to timber.
- Silviculture: Focuses on timber trees' establishment, growth, and reproduction.
- Horticulture: Cultivation of garden plants, not timber.
- Agroforestry: Integrates trees with crops/livestock, not specific to timber.
3. **Determine the most relevant option**: Silviculture is the most relevant as it specifically deals with timber trees.
4. **Conclude the answer**: The answer is Silviculture (option 2).
