Name the four major rivers that irrigate Andhra Pradesh, and explain why irrigation is described as the single most important determinant of the state's agriculture.

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**The four major rivers** watering Andhra Pradesh are the **Godavari**, the **Krishna**, the **Penna (Pennar)** and the **Tungabhadra** (a tributary of the Krishna system serving the interior). The Godavari and Krishna, in particular, form the great deltas that are the agricultural heart of the state.

**Why irrigation is the decisive determinant:**
1. **Delta productivity depends on assured water.** The **Krishna–Godavari delta** is highly productive precisely because it enjoys assured **canal irrigation** on fertile alluvial soil, allowing intensive, multi-crop rice cultivation — the basis of the "Rice Bowl" reputation.
2. **Rain-dependence makes the interior vulnerable.** The **Rayalaseema** region and other unirrigated tracts depend far more on tanks, wells and an uncertain monsoon, so they are repeatedly exposed to **drought** and crop failure.
3. **Water availability, not land alone, sets output.** Because the same soils yield very differently depending on whether they are irrigated, the state's agricultural output — and the incomes of most of its rural population — rises and falls with water availability. This is why state economic policy places such heavy emphasis on **irrigation projects**. …

Q.Name the four major rivers that irrigate Andhra Pradesh, and explain why irrigation is described as the single most important determinant of the state's agriculture.

Concept understanding — Sectoral Composition of the Economy

Q.Name the four major rivers that irrigate Andhra Pradesh, and explain why irrigation is described as the single most important determinant of the state's agriculture.

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