Symptoms of excessive trace elements

Calcium: A large amount of lime inhibits the absorption of magnesium, potassium, and phosphorus; when the pH is high, the solubility of manganese, boron, iron, etc. decreases, which promotes the occurrence of these element deficiencies.

Magnesium: When the Mg/Ca ratio in the soil is high, crop growth is inhibited.

Sulfur: No symptoms of over-sulfur in crops have been seen; large-scale application of sulfate fertilizers can cause soil acidification; in recent years, as an element of smoke damage, sulfurous acid gas poisoning has appeared.

Iron: A large amount of iron-containing substances increase the fixation of phosphoric acid, thereby reducing the fertilizer efficiency of phosphorus.

Manganese: The roots turn brown, the leaves appear brown spots, or the leaves turn white or purple; it is reported that the abnormal deciduous leaves of fruit trees and the red blight that occurs after the humus soil is cultivated into paddy fields are all due to excessive manganese; Too much iron deficiency.

Boron: Yellowing and browning of leaf margins.

Zinc: The new leaves are yellowed, and the leaves and petioles produce reddish brown spots.

Mo: Plants generally do not have symptoms of excessive molybdenum; the leaves appear chlorosis; the young plants of potatoes are red-yellow, and tomatoes are golden-yellow.