Agriculture

Soil pH and nutrient availability


The soil pH it is a fundamental property so much that it can influence many physical, chemical and biological processes, consequently it has a significant impact on crops.

The soil pH oscillates between a value of 4 and 9. Up to 5.5, the ground it is defined strongly acidic, for soil pH between 5.6 and 6 we speak of ground moderately acidic“, From 6.1 to 6.5 we are dealing with a ground weakly acidic". A soil by pH neutral has values ​​between 6.6 and 7.3 and, exceeding this value, we speak of ground alkaline.

The soil pH influences the solubility of nutrients and the activity of microorganisms present, for this reason, the pH regulates the availability of many plant nutrients.

What is the pH optimal for a ground?
Much depends on the type of plants we intend to grow, in fact there are plants acidophilic and plants basophilic, plant organisms which respectively prefer a ground tending towards acid or alkaline (values ​​higher than 7.4).

Nutrient availability based on soil pH
Generalizing it can be said that a soil by pH between 6 and 7 is favorable to plant growth because most of the nutrients are present in this range.

THE land with pH less than 5.5, in general, they have a low availability of calcium, magnesium and phosphorus; on the contrary, they offer a high presence of aluminum, iron and boron.

Conversely, at pH around 8, calcium and magnesium are very abundant. On the other hand, an alkaline pH can determine a low availability of nutrients such as iron, manganese, copper, zinc and especially boron and phosphorus.

What does the soil pH?
The pH of the soil it depends on a number of factors and again, to simplify, we will be forced to generalize. It can be said that the soil pH it mainly depends on the climatic conditions of the territory.

In areas with high rainfall and wetlands, soils will tend to be acidic. Irrigation also lowers the soil pH, so cultivated land will be more acidic than uncultivated ones. On the contrary, in arid and dry areas, the soils will tend to be basic, this is because the release of the bases is favored through the demolition of minerals present in the soil.


Video: Why is soil pH important to farmers? #aumsum #kids #science #education #children (October 2020).