The main symptom is leaf chlorosis. Individual leaves will become pale and yellow. In cereals, yellow discoloration from the leaf tip creates a “V” shape.
Nitrogen is a macronutrient that all plants need and is a key component in many important organic compounds such as amino acids, nucleic acids, and proteins.
Nitrogen uptake in plants occurs in the form of NO3− (ammonium nitrate), NH4+ from the soil, or N2 from the atmosphere with the aid of nitrogen-fixing bacteria.
All in all, the total content of nitrogen varies from 2 to 4% in dry plant matter.
A quantidade exata, o tempo e o método para a aplicação de fertilizantes variam dependendo da planta, do tipo de solo, da fase de crescimento e do método de implementação.
Alguns fertilizantes comuns à base de nitrogénio são ureia, nitrato de amónio e nitrato de cálcio e amónio.
*Names marked in red are considered to be highly poisonous to beneficial insects.
*Names marked in green are considered to be organic and IPM (integrated pest management) compatible.