Seed Rate

Description

Advanced Agronomy (Seeds/Seed Rate) Mind Map on Seed Rate, created by labradorlass on 18/05/2013.
labradorlass
Mind Map by labradorlass, updated more than 1 year ago
labradorlass
Created by labradorlass over 11 years ago
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Resource summary

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