Context: India's wheat production, primarily concentrated in the northwestern Indo-Gangetic plains, is under significant threat due to climate change.
Relevance of the Topic:Mains: Major crops, cropping patterns; Impact of Climate change.
Wheat
- Wheat is a rabi (winter) crop in India.
- Sown between October and December and harvested between February and April.
- Requirements:
- Optimum temperature: 15.5 degree Celsius. Warm and moist during the early stage, dry and sunny during late stage and harvest. Very sensitive to frost, requires frost free period.
- Moisture: between 45-65 cm. A light shower just before the harvest swells the grains and results in a good harvest. Excess of moisture can be detrimental to wheat. Cannot grow in areas of very low rainfall or with prolonged drought conditions.
- Soils: Light clay, heavy loam. Peaty soils are least suitable.
- Primarily grown in north-western parts of Indo-Gangetic plains.
- Primary producers: Uttar Pradesh, Punjab, Haryana, and Madhya Pradesh.
Impact of Climate Change on Wheat Production:
1. Indian Ocean warming and monsoon variability:
- The Indian Ocean is experiencing rapid warming, leading to alterations in monsoon patterns. This warming is associated with a reduction in summer rainfall over central-east India by about 10–20% over the past century.
- Delayed or erratic monsoon can postpone the kharif harvest, subsequently delaying the sowing of wheat. If its sowing starts late, the later stages of plant growth will coincide with early heat waves in India.
2. Rising temperatures and Yield reduction:
- India recorded its warmest February in 124 years in 2025. These conditions coincide with the wheat harvest season, where optimal temperatures should not exceed 30°C.
- High temperatures cause early flowering and faster ripening, shortening the grain-filling period. This results in lighter grains with lower starch accumulation, reducing the total wheat output.
3. High Input Cost and Economic losses:
- Low crop yield also tends to make farmers desperate and result in overuse of fertilisers, fungicides, etc.
- Extreme heat makes the wheat grain harder and affects the milling quality. Farmers may face lower market prices due to reduced grain weight and quality issues.
Way Forward
- Breeding heat-tolerant wheat varieties. Studies have shown that advanced breeding lines exhibit a smaller yield decline (3.6% per 1°C warming) compared to traditional varieties (5.5% decline), indicating superior climate resilience.
- Modifying sowing schedules to earlier dates can help wheat crops avoid late-season heat stress. This strategy requires region-specific research to optimise planting times in anticipation of climate variability.
- Enhancing irrigation efficiency, adopting conservation tillage, and implementing integrated pest management. These practices improve soil health and moisture retention, making crops more resilient to temperature fluctuations.
- Immediate policy support to farmers in the form of compensation. However, long term solutions (farmer education, R&D in heat-tolerant varieties, technology adoption, crop insurance) need to be incorporated into agricultural practices.
Climate change poses a significant threat to India's wheat production through altered monsoon patterns and rising temperatures. Ensuring food security necessitates proactive adaptation and mitigation strategies.