Seed Rate

Seed Rate

800 ears/m2
1. Approx 3 tillers per plant
  1. Affects no of ears per plant
  2. Spring plant population = 266
    1. established plants = 296
      1. 10% loss over winter
      2. rate = 350seeds/m2
        15% loss prior to establishment
      3. less plants/m2 means more shoots/plant
        HGCA 2000
    2. HGCA recommended populations
      1. Sept - 62
      2. Oct - 90
      3. Nov - 142
      4. Actual population is irrelevant
        Plant will grow to componsate
        hence no yield effect
      5. Minimum - no safety margin
        Every plant lost directly affects yield
As SR increases...
1. ...Yield increases
2. ...TGW increases, then decreases
  1. Hence quality effect if too high
3. ...HFN decreases and then increases
4. ...grain protein decreases
5. ...percentage of disease increases
  1. as more seeds
6. No specific weight relationship
7. Gooding et al 2002
Yield decreases linearly with date after 21st Sept
1. Green & Ivins 1985
Date of sowing
1. later date requires higher optimum no of plants/m2
  1. Spink et al 2000

Resource summary

	Created by labradorlass about 11 years ago