To ensure water does not stagnate near the roots.
Explanation
Tea is a plantation crop that thrives in tropical and sub-tropical climates. It requires abundant rainfall (150-250 cm) distributed throughout the year. However, the crop has a specific physiographic requirement regarding soil moisture and drainage.Analysis of Options:
- To prevent soil erosion. is incorrect: Cultivating crops on slopes generally increases the risk of soil erosion due to water runoff. While tea bushes are planted in rows to check erosion, the preference for slopes is not to prevent erosion but to utilize their drainage characteristics.
- To ensure water does not stagnate near the roots. is correct: Tea plants are highly intolerant of waterlogging. Stagnant water near the roots can lead to root rot and fungal diseases, destroying the crop. Gentle slopes ensure that despite heavy rainfall, water drains away rapidly, keeping the soil moist but not saturated.
- To allow easy movement of heavy machinery. is incorrect: Tea cultivation is traditionally labor-intensive, especially the plucking of leaves. Slopes make the use of heavy machinery difficult rather than easy.
- To maximize exposure to sunlight. is incorrect: While adequate sunlight is necessary for photosynthesis, the specific preference for slopes is dictated by the need for drainage. Flat lands can also receive maximum sunlight but are unsuitable if they lead to water stagnation.
Key Takeaway: The most critical condition for tea cultivation is well-drained soil; therefore, it is grown on gentle slopes to prevent water stagnation at the roots.