The May Week Gopal Changed His Watering Clock

At eleven in the morning, the tomato leaves were already folding.

Gopal had two and a half acres of vegetables near his village in Khammam district: tomato, brinjal, bhendi and a few rows of ridge gourd climbing a bamboo trellis. It was the second week of May. The air over the field shimmered. The wind that came across the dry paddy fields next door felt like it had blown out of a kitchen fire.

He had irrigated at noon the day before, the way he always did when the plants looked tired. Today they looked worse. Under the tomato plants, the soil was littered with yellow flowers that had fallen before setting fruit. On the brinjal, the side of the fruits facing the afternoon sun had turned pale and papery.

His workers had stopped at half past eleven, sitting under the neem tree, faces grey with heat. One of them, an older woman who had picked for his family for years, said she felt dizzy.

How do you know your crop has heat stress?

Heat stress shows up as flowers falling without setting fruit, pale or papery patches on fruits facing the sun (sunscald), leaves that wilt or curl in the afternoon, and leaf edges that dry and burn. The most important check is whether plants recover by evening.

Gopal learned the difference that week:

• Midday wilting that recovers by evening is the plant protecting itself. It is a warning, not yet damage.
• Wilting that stays into the evening or next morning means the roots are not getting enough water or are themselves damaged by heat.
• Flower drop in tomato, chilli and brinjal is common when days and nights are both very hot, because pollen stops working well.
• Sunscald appears on fruits exposed to direct afternoon sun, often where leaves have dropped.
• Burnt leaf edges show that the plant is losing water faster than it can draw it up.

He photographed the scalded brinjal and the dropped flowers and logged them in his farm journal, with the date and the temperature from the weather screen. He wanted to remember this week.

Why is watering at noon a mistake?

Watering in the hottest hours wastes much of the water to evaporation and can stress roots in hot soil. Water given in the early morning or evening reaches the roots and stays in the soil longer, so plants enter the hot hours already well supplied.

That evening, Gopal opened the local weather advice in Mapis Farming. The forecast showed several more days of extreme heat ahead, with hot nights too. The advice for his area said to irrigate in the cooler hours, protect soil moisture with mulch, avoid spraying in the heat, and keep labour to the early morning.

He had been watering by the clock of his worry. He needed to water by the clock of the sun.

How to protect crops in a heatwave, step by step

These are the steps Gopal followed that week and still follows every summer. Most cost little more than a change of habit:

1. Shift irrigation to early morning or evening. Give water before the heat builds, not in the middle of it. Light, more frequent irrigation is better than one heavy flood in hot weather; drip helps a lot here.
2. Mulch the soil. Spread paddy straw, dry leaves or crop residue between the rows, or use plastic mulch for raised beds. Mulch keeps the soil cooler and slows drying.
3. Use shade nets on sensitive crops. Gopal put up a light shade net over his tomato nursery and the youngest transplants. For bigger fields, a net along the hottest side or over high-value crops can help. Ask your horticulture officer which shade level suits your crop.
4. Don't strip leaves. Leaves shade the fruits. Avoid heavy pruning in summer.
5. Pick early in the day. Harvest in the morning, keep produce in shade, and get it to market quickly, because heat spoils vegetables fast.
6. Avoid spraying in the heat. Spraying in the hot hours can scorch leaves, much of the spray evaporates, and it is dangerous for the person spraying. If a spray is necessary, do it in the early morning or late evening, with a label-approved product at the label dose.
7. Hold back on fertiliser during the worst days. Ask your agriculture officer before giving fertiliser to heat-stressed plants, since stressed roots may not take it up well.
8. Plan with the forecast. Check local weather advice every day so you can water, harvest and plan labour before a hot spell, not during it.

How do you protect workers and animals in extreme heat?

Move field work to the early morning and late afternoon, give plenty of drinking water and shade, and stop work during the hottest hours. Heat illness can become serious quickly, especially for older workers and anyone working bent over in the sun.

Gopal changed the day for his workers. Work started at six and stopped before eleven, then resumed for a couple of hours in the late afternoon. He kept a pot of water and some salt-and-sugar drink in the shade. Anyone who felt dizzy, confused or stopped sweating was to rest in the shade at once, and he knew the way to the nearest health centre.

His two bullocks and the family's buffalo were moved to a shaded shed with water available all day. He did not work the bullocks in the afternoon.

Are heatwaves becoming more common?

Yes. Weather scientists and the India Meteorological Department have described heatwaves becoming more frequent and intense in many parts of India, including Telangana and Andhra Pradesh, as the climate warms. Farmers can't control that, but they can plan around it.

For Gopal, that means planting his heat-sensitive crops so their flowering avoids the worst weeks of May where possible, keeping mulch ready before summer, and checking the forecast as routinely as he checks his motor.

How Gopal's field came through

The heatwave lasted almost two weeks. He still lost some tomato flowers, and the first brinjal pickings had scalded fruits he had to sell cheaply. But after the switch to morning and evening watering and the straw mulch, the plants stopped wilting into the evening. New flowers began to set as soon as the nights cooled a little. None of his workers fell ill.

Next summer he plans to have mulch and shade net in place by the end of March. If you want to plan sowing around the weather too, read about using the forecast to time monsoon sowing. And if water is short in your summers, look at millets as low-water crops.

Frequently asked questions

What is the best time to irrigate crops during a heatwave?

Early morning is best, and evening is the next best choice. Water given at these times reaches the roots and stays in the soil, while water given at noon partly evaporates. Light, frequent irrigation, ideally through drip, works better than heavy flooding in extreme heat.

Why do tomato flowers drop in hot weather?

When both days and nights are very hot, tomato pollen does not work well, so flowers fall without setting fruit. Water stress makes it worse. Mulching, timely irrigation and light shade can reduce flower drop, and fruit set usually improves when temperatures ease.

Does mulching help in a heatwave?

Yes. A layer of straw, dry leaves, crop residue or plastic mulch keeps the soil cooler and slows the loss of moisture, so roots stay active in hot weather. It also reduces weeds. Put mulch down before the hottest weeks start.

Is it safe to spray pesticides in a heatwave?

Avoid spraying in the hot hours. The spray can scorch leaves, evaporate before it works and harm the person spraying. If a spray is truly needed, do it in the early morning or late evening with a label-approved product at the label dose, and wear protective clothing.

How can I get heatwave warnings for my village?

The India Meteorological Department issues heatwave warnings, and local news and the state agriculture department share them. Mapis Farming shows local weather advice for your farm location, so you can plan irrigation, harvesting and labour before a hot spell arrives.