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.
Jumlah dosis, waktu dan metode yang tepat untuk aplikasi pemupukan tergantung pada jenis tanaman, tipe tanah, fase pertumbuhan dan metode penerapanya.
Beberapa jenis nitrogen yang biasa digunakan antara lain urea, amonium nitrate dan kalsium amonium nitrate.
*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.