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.
تتباين الكمية الدقيقة، ووقت، وطريقة تطبيق الأسمدة تبعاً للنبتة، ونوعية التربة، ومرحلة النمو، وطريقة التطبيق.
هناك بعض الأنواع الشائعة من الأسمدة النيتروجينية مثل اليوريا، ونيترات الأمونيوم، ونيترات الكالسيوم والأمونيوم.
*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.