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How to increase the pH of the soil. All the instructions for making a groundalkalineorbasicand raise the soil pH.
Before you seehow to raise the pH of the soillet's see why it matters. The pH influences the fertility of the soil, especially the availability of micro and macro nutrients.
A soil with an alkaline pH (8.5) will be characterized by a good availability of Potassium (K) but will be deficient in Iron (Fe) and Phosphorus (P). This is why the basophilic plantsthey are all those plant species that have a reduced need for iron and phosphorus but a considerable need for potassium to thrive. Calcium and magnesium are more effective if the pH is slightly basic.
Usually sandy soils and those rich in humus are acidic, while calcareous ones have an alkaline reaction and therefore more suitable for the cultivation of so-called basophilic plants.
How to increase the pH of the soil
It is clear that he intends to cultivate us in pots, he will only have to buy atopsoilfor plantsbasophilicwithout using any amendments. Those who cultivate in the open field, on the other hand, will be forced to modify the chemical properties of the soil by increasing itspH.
The modification of thealkalinityof the soil must be performed at least one month before planting the basophilic plants. After the first treatment, others will have to follow also during cultivation. Due to rainwater and the presence of organic fertilizers, many soils tend to acidify.
To decrease or increase the pH of the soil, it takes time, so make sure to intervene at least one month before implantation.
For make a soil alkalineand raise its pH, you can add simple elements such as:
- wood ash
- calcium carbonate
Wood ash, to alkalize the soil, must be mixed with the soil in large quantities.
As far as calcium carbonate is concerned, it will be necessary to act more expertly: the dosages to add depend on the type of soil. To find out how much calcium carbonate to add to the soil, read the instructions on the manufacturer's label. In general, the quantities to be added for each square meter of soil are:
- 120 grams in case of sandy soil
- 240 grams in case of moderately clayey soil
- 360 grams in the case of completely clayey soil
- 750 grams in case of peaty soil
Calcium carbonate is added to the soil by the formulas of sodium hydroxide(NaOH) and sodium carbonate (Na2CO3). The same formulations are used for the extraction of cyanides present in the soil in order toinvigoratethe fertility of the soil.
As stated, it takes time to alkalize the soil. When the soil is very acidic and structurally littlereceptive, it may take years to reach thepHdesired. To monitor the pH values reached, we recommend that you follow the instructions given in the guide article:How to check the pH of the soil. In this guide you will find directions for using litmus papers.
If you have acidic soil and are unable to alkalize it, you can always grow acidophilic plants. In this perspective, you can consult the list of acidophilic plants in the guide article entitled "How to take care of acidophilic plants ".
How to decrease the pH of the soil
For all those who wonderwhat to do with an alkaline soilor how to correct basic soil, help is availableHow to lower the pH of the soil. To make the soil acidic, you can count on the use of various soil improvers, the most common being coffee. Even irrigation with rainwater, in the long run, can lower the pH of the soil.