Mix around 5lbs of aluminium sulphate around the base of the plant you want the soil ph lowered to reduce the ph by around 1 unit. To make the ph higher less acidic try adding a form of lime such as finely ground agricultural limestone.
What Is Alum Used For Suggestions For Using Alum In The Garden
For other plants safer options are available such as ammonium sulfate.
Aluminum sulfate for potted plants. Many experts now recommend that aluminum sulfate is used only on hydrangeas where the aluminum helps create the vivid blue flowers that are prized. Reapply aluminum sulfate annually to your garden according to package directions to maintain the soil ph and add nitrogen. Sulfur and aluminum sulfate can lower soil ph.
Apply early spring using 500 g per 10 m 1 lb 100 ft or 45 60 ml 3 4 tbsp per medium sized individual plant. You need 0 6 pound of aluminum sulfate per 0 5 drop in ph you want to achieve per 10 square feet of planting area in loam soil. Increase the rate by one half for clay soil or decrease it by.
I ve found that adding 4 grams of aluminum sulfate per gallon of soil will lower the ph to 6 3 6 4. Mix sphagnum peat moss into the soil before planting a garden to improve drainage and add acidity to the soil. Dissolve 3 ml per 1 l of water tsp 1 qt and drench soil with the mixture.
Work into the surface of the soil and water well. Spread it on the soil and hoe it in gently around existing plants. Then the acidified soils.
I use pro mix which is usually 7 right out of the bag. The amounts of sulfur aluminum sulfate. Always check the dosage on your label before application.
Aluminum sulfate shouldn t be used for large applications because it can lead to aluminum accumulation or even aluminum toxicity in the soil. Apply every 3 4 weeks as needed. Aluminum sulfate is very effective at lowering the ph of soil.
Aluminum can be absorbed from drinking water and excessive use of aluminum sulfate as a soil amendment can contribute to the contamination of groundwater supplies. As the soil dries out the ph will slowly rise back up to around 6 7 but will go back down again with the next watering. If soil is alkaline ph exceeds 7 use aluminum sulphate to lower the ph.
The estimated quantities of aluminum sulfate 380 g and calcium carbonate 48 g were thoroughly mixed through 100 kg batches of the soil which was potted 2 kg pot.
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