Understanding pH and Soil Drainage

Understanding pH and Soil Drainage

Understanding pH and Soil Drainage

Healthy Plants Need Healthy Soil

Growing a healthy plant, starts with healthy soil! Here are a few factors to consider when mixing and maintaining your soil for healthy plants. These will also vary depending on the specific plant and type of garden you are growing, but let’s start with the basics.

pH

pH is the measure of acidity or alkalinity of a substance. It is a scale from 1 to 14. Low numbers are more acidic and high numbers are more alkaline/basic. 7 is the magic number that marks neutrality. Every unit from 7 indicates the soil is 10 times more acidic or basic. pH is important because it changes the chemistry of the soil. If it is too high or low, nutrients can become less available to the plant because of the chemical state. Acidic soils can cause deficiencies of phosphorus, calcium, magnesium, and molybdenum and cause toxic levels of manganese and aluminium. Alkaline soils can cause deficiencies in iron, manganese, boron, copper, and zinc. This means that the pH can directly affect the health of your plant if nutrients are unavailable to them. Many plants perform best in neutral soils (pH approximately 7.0) however some prefer acidic or basic soils.

An example of some common plants and there pH levels can be found below. For a detailed list, please read our Optimum pH for Common Plants article.

  Acidic (pH 4.5 – 6.0) Basic (7.0 - 8.0)
Ornamental

Azalea   

Camellia

Erica

Gardenia 

Holly

Hydrangea 

Magnolia 

Pelargonium

Rhododendron

Sweet Pea

Cacti      

Geranium

Gerbera 

Hebe 

Hibiscus

Ivy 

Poinsettia 

Viburnum
Fruit

Blueberries

Cranberries
Melon
Vegetable Potato

Beetroot

Chervil

Choisya   

Leek

Spinach

 

To measure the pH of soil, use your Carbon Garden 3-in-1 Garden Meter (included with your Carbon Garden Kit), which is super easy to use and gives you a quick reading of the soil pH. If your soil is too acidic, add lime to increase the pH. If your soil is too alkaline, add sulphur to decrease the pH.

Water retention/drainage

Plants require balance between water retention and adequate drainage for optimal health. To find this balance you need to consider watering routines as well as soil drainage. If there is not enough water, the plant cannot grow. If soil is inadequately drained, the water build-up prevents aeration of the soil. This creates an environment where harmful bacteria and fungus can multiply and attack the roots, leading to root rot (a large part of The Carbon Garden program, is all about promoting healthy, good bacteria and fungus, but harmful microbes can cause serious problems if left unattended.) If oxygen is lacking in the soil, there is interference of nutrient uptake into the plant and photosynthesis which creates energy for the plant.

You can use your included 3-in-1 Garden Meter for an easy option to understand whether your plants are ready to be watered or not. Alternatively, you can insert a finger into the soil to test the moisture. It is important to know that different plant types have individual watering requirements, and you should always read their labels for a better understanding of their needs.

Plants show signs as well. Underwatered plants may have brown crispy tips of leaves. Overwatered plants may be wilted despite moist soil, brown limp leaves or yellowing.

To increase water retention To increase water drainage
Add vermiculite Add perlite or pumice
Add peat moss Add sand
Ensure adequate holes at bottom of pot
Add charcoal
Add layer of gravel at the bottom of your pot

 

Nutrients

Soil provides the major source of nutrition for plants. As we have discussed, pH and water retention in the soil play an important role in the availability of nutrients for a plant. The main nutrients required are nitrogen, phosphorus and potassium which together form the trio NPK. Plants also need calcium, magnesium, sulphur, iron, manganese, zinc, copper, boron, and molybdenum.

Humus is nutrient rich and a great way to replenish nutrients in your garden. It is the decomposed product that results from composting. Another natural fertiliser is manure which can be added to your garden. To complement the addition of nutrients, using CropBioLife helps your plant to utilize available nutrients better. It aids uptake of nutrients, transport of nutrients around the plant and utilization of the nutrients.


Older post Newer post