Mineral
Urea یوریا
The most concentrated nitrogen fertilizer in common use.
N 46%P₂O₅ 0%K₂O 0%
What it is
Urea carries 46% nitrogen — the highest N concentration of any common solid fertilizer. Plants take up its nitrogen as ammonium and then nitrate after soil microbes convert it. Because the nitrogen is highly soluble, it is normally split into two or three applications rather than applied all at once.
Benefits
- Highest nitrogen per kilogram, so less product to transport and handle
- Suitable for basal and top-dressing applications
- Works across cereals, cotton, sugarcane, maize and vegetables
Precautions
- Nitrogen can volatilize as ammonia if urea sits on the ground surface — on hot, windy days losses start within hours, so irrigate or incorporate within a day of application
- Avoid mixing with superphosphate in the same application heap for long storage
- Do not exceed the recommended dose: excess nitrogen causes lodging and delays maturity
Application guidance
Apply as per the calculated dose, split into basal + 1–2 top-dressings at active growth stages (e.g. wheat: sowing, crown-root initiation ~21 days, flowering). Broadcast evenly and irrigate lightly afterwards where possible.
Pertanyaan umum tentang Urea
Berapa lama Urea bertahan di dalam tanah?
Urea berubah menjadi amonium yang tersedia bagi tanaman dalam waktu sekitar 2–4 hari, kemudian menjadi nitrat selama 2–4 minggu berikutnya tergantung suhu dan kelembapan tanah. Secara praktis, satu aplikasi Urea memberi makan tanaman selama kurang lebih 4–6 minggu — itulah sebabnya nitrogen biasanya dibagi menjadi 2–3 aplikasi selama musim tanam.
Urea vs NPK — apa bedanya?
Urea hanya memasok nitrogen (46% N), sedangkan pupuk NPK memasok nitrogen, fosfor, dan kalium sekaligus — misalnya, NPK 19-19-19 mengandung 19% dari masing-masing unsur. Jika hanya nitrogen yang kurang, Urea saja sudah cukup; jika ketiganya dibutuhkan, gunakan NPK atau kombinasi pupuk tunggal.