Nutrient imbalance

An excess of one nutrient results in a generalized yellowing of the foliage called chlorosis.

In the case of magnesium deficiency, yellowing frequently occurs between the leaf veins in broadleaf trees.

Excessive sodium (and chlorine) uptake after salting roads in winter or on naturally salty soils quickly causes browning of the foliage.

In case of acute deficiency or toxicity, there can be a significant loss of vitality and growth, even leading to the death of some plants.

• However, only a leaf analysis can identify the elements involved.

Chestnut can be satisfied with a pH between 4.5 and 6.5. It is a calcifuge species, i.e. it shows signs of distress in soils with labile limestone in the so-called "active" soil (at a rate of >5%). On soils with a high concentration of active limestone, excess calcium disrupts the uptake of other elements such as nitrogen, iron and manganese.