NPK 21-16-8 — Spring Growth Formula for Cereals & Cotton
Spring top-dress demands high nitrogen with supporting phosphorus and a modest potassium fraction — 21-16-8 matches this profile for wheat, barley and cotton at tillering and squaring stages. The 45% total nutrient content keeps application rates practical on large arable units. From 1,000 MT.
Quality Parameters
- FOB
- CFR
- CIF
- Agriculture
- Blending
- Fertigation
Top-Dress Timing
Apply 21-16-8 at 150–250 kg/ha at GS 25–30 (stem extension) on winter wheat. Cotton receives 200–300 kg/ha at first square formation. The N-forward ratio supports tiller survival and boll set respectively.
FAQ
Should 21-16-8 replace urea top-dress on wheat?
Where soil P and K are adequate, straight urea is cheaper per kg N. 21-16-8 suits fields needing simultaneous P and K correction alongside the spring N boost.
Is 21-16-8 suitable for rice?
Yes, at panicle initiation in rice — the 21% N supports spikelet formation while P and K aid grain filling. Apply to moist soil and incorporate where possible in flooded systems.
What spreader settings suit 21-16-8 granules?
Standard 2–4 mm NPK settings on twin-disc spreaders. Check overlap pattern at 18–24 m bout width; granule density is typical for compound NPK.