Discuss the relationship between El Nino and south-east monsoon in India and its impact on agriculture.

El Niño and the monsoon link

• In a typical El Niño, the Walker circulation weakens, Pacific convection shifts east, and the rising limb over the Indian Ocean and South Asia is often suppressed.
• All-India summer monsoon rainfall (ISMR) then tends to be below normal, with a higher chance of drought years—but not every El Niño is a drought (the Indian Ocean Dipole can wet the monsoon, as in some years).
• La Niña, the cold phase, more often favours a normal or excess monsoon, again with exceptions.
• Onset delay, long breaks in July–August, and uneven spatial spread (deficient north-west, patchy east) matter as much as the seasonal total.
• South-east trades are the Southern Hemisphere winds that, after crossing, become the southwest monsoon current over the Arabian Sea and Bay of Bengal; El Niño alters that whole Walker–monsoon coupling, not a separate ‘southeast rainy season’ of India.

Impact on agriculture

• Kharif rice, maize, soybean, groundnut, cotton, and rainfed pulses in the Deccan and central India are the first to lose if June–September rain fails or comes in few violent spells.
• Sugarcane and paddy in canal commands suffer when reservoirs (live storage) stay low; Uttar Pradesh cane and rice feel both rain and canal water.
• Drought raises fodder and drinking-water stress, cuts rural labour demand, and can push food inflation; the government then uses MSP procurement, drought relief, and later rabi planning.
• A weak monsoon can still allow a good rabi if winter western disturbances and groundwater help wheat—so the farm year is not only kharif—but groundwater over-pumping is itself a cost of monsoon failure.
• Forecasting (IMD ENSO updates, IOD watch) is now part of agricultural risk management, not only a geography note.