growing winter wheat
Safe rates of seed-placed nitrogen fertilizer using ammonium nitrate (34-0-0) and urea (46-0-0) at two seedbed utilization levels and three moisture levels
- Nitrogen Fertilizer1
- % Available soil moisture
- – lb N / acre –
- 10% SBU2
- 50%
- Ammonium Nitrate
- > 75%
- 65
- 80
- (34-0-0)
- 50% – 75%
- 50
- 65
- < 50%
- 40
- 50
- Urea
- > 75%
- 55
- 70
- (46-0-0)
- 50% – 75%
- 40
- 50
- < 50%
- 30
- 40
1 Available soil moisture is stated in per cent of field capacity for medium (loam) to fine textured (clay loam) soils. Assumes soil moisture will not change significantly during germination and emergence of winter wheat. If soil moisture decreases after seeding,
then some fertilizer injury may occur.
2 SBU – seedbed utilization is the per cent of the seedbed over which fertilizer and seed are spread.
then some fertilizer injury may occur.
2 SBU – seedbed utilization is the per cent of the seedbed over which fertilizer and seed are spread.