5 Signs that your crop is under stress before it’s too late
If there’s one thing we often see in the field, it’s that stress doesn’t appear overnight.
Before a plant shows obvious damage, it usually sends out subtle signals indicating that something is wrong. The problem is that these symptoms often go unnoticed or are mistaken for other common occurrences in the crop.
These are some of the signs we usually observe when a crop begins to suffer from stress.
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1. The crop stops growing at its usual rate
One of the first signs is usually a general loss of vigour.
The plant looks healthy, but something has changed. The shoots grow more slowly, vegetative growth slows down and the crop loses some of the vigour it showed a few weeks ago.
When a plant faces conditions such as water shortage, high temperatures or salinity, it needs to devote much of its energy to staying alive. As a result, it reduces the resources allocated to growth.
That is why stress is often detected earlier by observing the crop’s development than by the appearance of visible damage.
2. The leaves lose their firmness during the hottest part of the day
You’ve no doubt noticed on more than one occasion how some plants seem to perk up in the morning and at dusk, but during the middle of the day their leaves droop or appear less turgid.
This is a common response when the demand for water exceeds the plant’s ability to absorb it.
Although it may seem like a one-off occurrence, when this situation repeats itself continuously, it is a clear sign of stress that should be monitored.
3. The colour of the plant changes
Colour also tells us a great deal.
A healthy plant usually looks uniform and vigorous. However, when it is under stress, symptoms such as the following may appear:
- Paler leaves.
- Yellowing.
- Loss of green colour intensity.
- Dry edges or necrosis.
This does not always mean there is a nutritional deficiency. In many cases, the problem is related to difficulties in properly absorbing or utilising the available nutrients.
4. Flowering and fruit set are adversely affected
The flowering and fruit-setting stages are particularly sensitive.
Under adverse conditions, the plant prioritises its survival and may reduce some of its reproductive effort.
The result?
- Fewer viable flowers.
- Flower drop.
- Setting problems.
- Fewer fruits per plant.
In many fields, yield losses stem precisely from periods of stress experienced during these stages.
5. The problem becomes apparent at harvest time
Sometimes the crop seems to be developing satisfactorily throughout the growing season, but it is only at the end that the consequences become apparent.
Smaller fruit, less uniformity, lower quality or lower-than-expected yields are usually some of the most common signs.
That is why we place such emphasis on the importance of monitoring the crop throughout its entire cycle, and not just when obvious damage becomes apparent.
Prevention remains the best strategy
In agriculture, we cannot always prevent a heatwave, a period of drought or certain environmental conditions.
What we can do, however, is better prepare the crop to cope with them.
A balanced nutrient supply, a well-developed root system and proper agronomic planning help the plant to maintain its physiological activity and respond better when stressful situations arise.
Our experience shows that the best decisions are usually made before a problem arises.
Conclusion
Plants are constantly communicating. The key is knowing how to interpret the signals.
Detecting a loss of vigour, changes in colour, setting problems or stress-related symptoms at an early stage allows us to take action before crop yield is compromised.
Because by the time the damage is visible, the plant has usually been trying to warn us for some time.
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