Potassium deficiency: what it is, how it develops, and how to fix it in fruit

• Conduct a soil analysis when potassium deficiency is suspected to determine its actual availability before increasing fertilizer doses.

• Maintain balanced fertilization adapted to the specific needs of the crop and its stage of development.

• Apply potassium fertilizers when analyses indicate insufficient availability and the crop has a high demand.

• Adjust potassium doses considering the crop's expected uptake and the anticipated yield.

• Avoid excessive potassium applications, as a high application rate can cause imbalances with other nutrients, especially calcium and magnesium.

• Split potassium applications when soil characteristics or crop needs make gradual release advisable.

• Maintain relatively stable soil moisture to promote continuous potassium uptake by the roots.

• Avoid prolonged periods of drought that reduce root activity and hinder nutrient absorption.

• Also avoid prolonged waterlogging, which can reduce soil oxygenation and impair root function.
• Improve drainage where water frequently accumulates around the root system.

• Avoid soil compaction and promote a structure that allows for adequate root expansion and activity.

• Maintain a healthy and active root system, preventing damage during transplanting, cultivation, or work around the plants.

• Pay special attention to sandy soils or soils with low cation exchange capacity, where potassium can be lost more easily.

• Avoid excessive irrigation, which can promote potassium leaching, especially in light soils.

• Maintain adequate levels of organic matter to improve soil structure and nutrient retention capacity.

• Monitor for potential imbalances between potassium, calcium, and magnesium that could interfere with the absorption of these nutrients.

• Avoid excessive nitrogen fertilization, which leads to excessive vegetative growth and increases the crop's nutritional requirements. • Ensure an adequate supply of potassium during periods of peak demand, especially during fruit growth and ripening.

• Use potassium sources appropriate to the soil characteristics, avoiding those that unnecessarily increase salinity when it is a problem.

• Monitor the electrical conductivity of the soil or nutrient solution in intensively fertilized crops.

• Periodically observe the size, color, firmness, and uniformity of the fruit to detect any nutritional deficiencies early.

• Supplement soil analysis with foliar analysis when necessary to confirm the plant's nutritional status.

• Correct any irrigation, drainage, or root problems that may be hindering potassium absorption before increasing fertilizer doses.

• Remove severely affected fruit once it has lost its commercial value and correct the underlying nutritional conditions.

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