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Strawberries are highly sensitive to changes in nutrient balance, soil conditions, and irrigation management. Nutrient deficiencies and excessive fertilization can directly affect plant growth, flowering, fruit set, fruit size, and marketable quality. Balanced nutrition is particularly important for strawberries intended for export, where uniform fruit size, attractive color, suitable firmness, and high quality are essential.
Early identification of nutrient deficiency symptoms in strawberries helps growers determine the potential causes of poor growth, misshapen fruits, and leaf scorch, allowing them to take appropriate measures to maintain crop productivity and fruit quality.
In this article, we explore the main symptoms of macronutrient and micronutrient deficiencies in strawberries, their potential causes, and practical approaches to managing them through balanced fertilization and proper irrigation.
Strawberry plants require essential macronutrients, including nitrogen, phosphorus, potassium, calcium, and magnesium, in amounts that vary according to their growth stage and nutritional requirements. A deficiency in any of these nutrients may cause physiological disorders that affect vegetative growth, yield, and fruit quality.
Calcium plays an essential role in cell wall formation and maintaining the structural integrity of plant tissues. It also supports the healthy development of young leaves, roots, and fruits.
Symptoms of calcium deficiency:
Causes of calcium deficiency
Symptoms do not always indicate a low calcium concentration in the soil. They may also result from limited calcium transport within the plant due to irregular irrigation, high salinity in the root zone, poor root activity, or reduced transpiration under conditions of high relative humidity.
How to manage calcium deficiency
Management begins with evaluating irrigation consistency, soil salinity, and irrigation water quality. Calcium supply should then be adjusted according to crop requirements.
Migma Reto can be incorporated into a soil fertilization program, while Caprive can be considered as part of a foliar application program, in accordance with each product's registered composition, label instructions, and the crop's growth stage.
Nitrogen is essential for protein and chlorophyll formation and supports vegetative growth and the development of new leaves.
Symptoms of nitrogen deficiency:
Causes of nitrogen deficiency
Nitrogen deficiency may result from insufficient nitrogen fertilization, reduced root uptake due to irrigation problems or salinity, or nitrogen losses through drainage water.
How to manage nitrogen deficiency
The fertilization program should be reviewed to determine the plant's actual nitrogen requirements at each growth stage. Excessive nitrogen application should be avoided because it may promote excessive vegetative growth at the expense of the balance between vegetative development and fruit production, potentially affecting fruit quality.
Phosphorus contributes to energy transfer within the plant, root development, new tissue formation, and the processes associated with flowering and fruit production.
Symptoms of phosphorus deficiency:
Causes of phosphorus deficiency
Phosphorus deficiency may result from low levels of available phosphorus in the soil, phosphorus fixation in forms that plants cannot readily absorb, or reduced root activity in cold or poorly aerated soils. Soil pH also influences phosphorus availability.
How to manage phosphorus deficiency
Soil analysis should be used to assess phosphorus availability and soil pH, while root health should also be evaluated. The appropriate phosphorus source and application method should then be selected according to the crop's nutritional requirements and growth stage.
Potassium plays an important role in regulating water movement within plants, activating enzymes, supporting sugar transport to fruits, and improving important fruit quality characteristics.
Symptoms of potassium deficiency:
Causes of potassium deficiency
Potential causes include low levels of available potassium in the soil, fertilization rates that do not meet crop requirements, and impaired nutrient uptake caused by salinity or competition between nutrients.
How to manage potassium deficiency
Effective potassium nutrition requires an appropriate potassium source applied at the correct rate and timing, while maintaining a suitable balance between potassium, calcium, and magnesium.
PLANTS for Agriculture & Trade offers several fertilizer solutions that can be incorporated into strawberry nutrition programs, including:
The choice between soil application and foliar spraying depends on the product formulation, plant growth stage, soil and water analysis, and technical recommendations.
Strawberry plants require micronutrients in smaller quantities than macronutrients, but these elements remain essential for numerous physiological processes. Iron, boron, and magnesium deficiencies can produce visible symptoms affecting leaves, roots, and fruit development.
Iron is essential for chlorophyll formation indirectly and participates in several physiological processes associated with respiration and photosynthesis.
Symptoms of iron deficiency:
Causes of iron deficiency
Iron deficiency commonly occurs when soil pH is high, reducing iron availability for plant uptake. High bicarbonate concentrations in irrigation water and poor root function may also contribute.
How to manage iron deficiency
The underlying cause should be identified before selecting an iron source suitable for the soil conditions and pH. Appropriate iron chelates can help improve iron availability under certain conditions.
Bastion Iron 6% can be incorporated into an iron deficiency management program according to its registered formulation, soil conditions, and product recommendations. The stability of its iron chelate under field conditions should also be considered.
Boron supports young tissue development, cell wall integrity, flower development, pollination, and fruit set.
Symptoms of boron deficiency:
Causes of boron deficiency
Boron deficiency may result from low levels of available boron in the soil, irregular moisture in the root zone, or conditions that limit nutrient uptake.
How to manage boron deficiency
Boron application rates must be carefully adjusted to crop requirements because the difference between an adequate dose and an excessive dose is relatively small. Overapplication can cause plant toxicity.
Migma Combi Alpha can be incorporated into a micronutrient nutrition program according to its registered composition and crop requirements. Repeated applications should be avoided unless the plant's nutritional status justifies them.
Magnesium is a central component of the chlorophyll molecule and is therefore directly associated with photosynthetic efficiency and the production of carbohydrates within the plant.
Symptoms of magnesium deficiency:
Causes of magnesium deficiency
Magnesium deficiency may result from low soil magnesium levels, excessive potassium or calcium concentrations that interfere with magnesium uptake, or problems affecting root function.
How to manage magnesium deficiency
Management begins with reviewing the balance between major nutrients rather than applying a single nutrient without evaluating the plant's overall nutritional status.
Migma Camago, which contains nitrogen, calcium, and magnesium, can be incorporated into the fertilization program to help supply these nutrients according to crop requirements and product recommendations.
Not all physiological disorders result from nutrient deficiencies. Excessive fertilization or an imbalance between nutrients can produce symptoms similar to deficiencies and interfere with the plant's ability to absorb water and nutrients.
High concentrations of dissolved salts in the root zone increase soil electrical conductivity (EC), making water absorption more difficult and potentially causing salt stress.
Common symptoms:
Prevention and management:
Excessive application of one nutrient may reduce the uptake of another. This interaction is known as nutrient antagonism.
For example, excessive potassium or magnesium may interfere with calcium uptake under certain conditions. Similarly, high calcium or potassium levels may affect magnesium balance.
Random fertilizer applications or repeated fertilization without testing may therefore lead to overlapping symptoms that cannot be resolved by adding a single nutrient.
The solution: Develop a balanced fertilization program based on soil and irrigation water analyses, crop growth stages, and the actual requirements for both macronutrients and micronutrients.
Effective fertilization and irrigation management help reduce the risk of nutrient deficiencies, improve fertilizer use efficiency, and maintain crop quality.
Soil and water analyses help determine available nutrient levels, soil pH, and the salinity of both soil and irrigation water (EC). This information supports more accurate fertilization decisions.
Consistent moisture in the root zone is essential for nutrient uptake, particularly calcium and boron. Severe drying and prolonged waterlogging should be avoided, while adequate drainage and soil aeration should be maintained.
Fertilizers should be selected according to their composition, nutrient availability, and suitability for local soil and water conditions.
For example, high-pH soils may require iron sources appropriate for those conditions, while salt-affected soils require careful management of salinity and fertilizer sources.
Foliar spraying may help correct certain nutrient deficiencies when the nutrient can be effectively absorbed through the leaves. However, it does not always address the underlying problem in the soil or root system.
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