Acidic soil: Deficiencies are more likely when the soil’s pH level is below 5. Most plants’ roots absorb calcium easier in neutral or slightly alkaline soils. [2] X Research source Nutrient imbalance: High soil levels of potassium, magnesium, or other essential plant nutrients can block the roots’ uptake of calcium. [3] X Research source Dry soil: The soil is not consistently moist enough for the roots to absorb enough nutrients for healthy growth. [4] X Research source Environmental conditions: The plant is located in an area with stagnant airflow, low air or soil temperatures, or high humidity. [5] X Research source Low calcium in the soil: In rare instances, the soil simply lacks enough calcium to support healthy plant growth. [6] X Research source
Distorted or irregular young leaves with curled tips or edges. Ragged-looking leaves with brown spotting or scorching. Dead terminal buds. Bare or underdeveloped root system. Blossom-end rot or fruits that decay rapidly in storage. Stunted or very slow growth. [10] X Research source
Check the care instructions for your plants to determine the ideal watering schedule and amount. Water less in high humidity. Transpiration slows when the air is humid, meaning the plant will draw in less water through its roots. [12] X Research source
Read your fertilizer’s instructions for the recommended amount. In most cases, add a handful of fertilizer for every 72 square inches (1. 8 square meters). Check fertilizer ingredients closely. They contain many nutrients and minerals, so choose one that fits your soil’s particular balance. If possible, try to fertilize your soil annually to gradually build up a higher calcium level.
Cal-mag supplements also increase the soil’s pH level, which helps with calcium absorption.
Alternatively, mix wood ash into the top 2-4 inches (5-10 cm) of soil around your plants. About 2 pounds (0. 91 kg) of ash per 100 square feet (30. 5 square meters) is sufficient. [16] X Research source Other calcium-rich organic materials include bone meal, rock dust, and gypsum. If possible, add your ash, eggshells, or oyster shells to the soil about 2 weeks before planting to calcify the soil ahead of time.
Read the instructions on your pH water container for the recommended amount and application directions. Find pH water online or at your local gardening center or nursery.
If your plant needs more air moisture to thrive, set the humidity above 60%, mist it with a spray bottle, or group it with other plants. Wind removes the boundary layer of moisture surrounding leaves, which increases transpiration into the atmosphere. [21] X Research source When the air is drier than a plant’s leaves, the plant moves more water through its system and out into the air. [22] X Research source
Knowing the tendencies of your soil helps you prepare it properly before planting. DIY pH testers are available online or at gardening centers and plant nurseries.
A pH level of 7. 0 is considered perfectly neutral. Lime raises both pH and calcium levels. If you need to raise calcium without altering the pH level, consider gypsum instead. Lime is poorly soluble, so make sure it’s thoroughly spread throughout the soil before planting to make it effective. [25] X Research source
