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Sowing

Seed

The Teagasc current recommended seeding rates see below:
Spring Cereal Seeding Rate Calculator 2016 (Excel).

Certified seed offers growers high germination capacity, purity of sample, free of weed seeds within tolerance levels and is treated against seed borne diseases. The DAFM has produced a comprehensive guide on seed certification

Where seed is home-saved then it is important that it is tested for germination, Micodochium (Fusarium) seedling blight, etc. to ensure that it is suitable for use as seed.

As spring barley drilling dates are delayed, you should adjust seed rates (upwards) to take into account of higher expected estabilishment rates and lower tillering capacity.

Use the following calculation to set your drill:

  • Target Plant Population   X   TGW
  • Estimated plant establishment % = seed rate in kg/ha
  • E.g. if you are drilling Propino with a TGW of 50.9 g and you want to establish 280 plants/m2 with a germination test is 95% and you estimate potential field losses (pests, capping etc) to be 10% then you should drill.
  • 280   X   50.9 ÷ 85 = 168kg/ha

The following video highlights the importance of using thousand grain weight to calculate the seed rate; Calculate seed rate(Youtube).

Assumes *85% establishmentSpring Oats  The following video describes how to calibrate the seed drill to achieve the correct seed rate Calibrate seed drill(Youtube)After drilling and when the seed emerges it is important to carry out a plant count as this will help to determine if the correct seed rate was used.Carrying out a plant count

Spring Barley    

Sow 350seeds/M2

To establish 300 seeds/M2

TGW  Check seed bag for TGW   Kg/ha* St/ac* 
40.0  141 9.0 
42.0 148 9.4
44.0 155 9.9
46.0 162 10.3
48.0 169 10.8 
50.0 176 11.2
52.0 184 11.7 
54.0 191 12.1
56.0 198 12.6
58.0 205 13.0
Assumes *85% establishment  

 

Spring Wheat  

Sow 350seeds/M2

To establish 300 seeds/M2

TGW  Check seed bag for TGW  Kg/ha* St/ac* 
35.0  144 9.2
37.0 152 9.7
39.0 161 10.2
41.0 169 10.8
43.0 172 11.4

 

Spring Oats 

Sow 350seeds/M2

To establish 300 seeds/M2

TGW  Check seed bag for TGW  Kg/ha* St/ac* 
29.0  119 7.2
31.0 121 7.7
33.0 128 8.2
35.0 136 8.7
37.0 144 9.2