MARGINAL ZONE

What pasture cultivars?

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Farming zones in WANA

Overview of the zone

GUIDE  FOR FARMERS AND EXTENSION AGENTS

TECHNICAL BACKUP FOR EXTENSION PROGRAMS

POLICY MAKERS AND PROJECT PLANNERS

 HIGH   RAINFALL  ZONE

  ABOVE 500 mm

CEREAL  ZONE

     500 mm  to 200 mm 

    Medic overview

Deep ploughing overview

What cultivar?

 How does your medic grow?

   MARGINAL  ZONE 
   

  250 mm  to 150 mm

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 Tenure and grazing management

RANGELAND

Below 200  mm

Rangeland overview

Action plan for flockowners

Water harvesting

Physical characteristics

    The marginal zone is defined in land use and tenure terms rather than rainfall. It is the zone between the Cereal Zone and the Rangeland where cereal crops are sown for pasture to establish tenure rights over common property rangeland or parcour.

    In rainfall terms it is usually 250 to 150 mm. Soils are alkaline and suited to medic.
 

Cultivars.

    There are some excellent cultivars available for this rainfall zone. Refer to the selection of cultivars for the cereal zone for a more comprehensive account. What cultivar?

    Swani disc medic

    Serena burr medic

    Herald strand medic

    are all suitable for early season and extremely early season cereal and the Marginal Zones from 250 to 150 mm.

    Sava snail medic

    Parabinga barrel medic

    are suitable for early season in the Marginal Zone perhaps 250 to 200 mm.
 

Seed size

    Swani, Serena and Herald have the advantage of small seed. Grazing management will be difficult in this zone as large numbers of sheep cross the zone in spring from the rangeland to the cereal stubbles.

Small seeded medic survive better under conditions of overgrazing.

The snail medics are not recommended and barrel (an intermediate pod size) medic should only form a small part of the mixture.

Practical experience

    Libya has the greatest amount of experience in sowing large areas (5,000 to 10,000 ha) of the marginal zone and rangeland to medic.

    Large areas of medic were sown using imported seed from Australia and conventional seeding equipment.

The cultivars used were the older ones than have been replaced by the ones listed above.

For example Harbinger was used rather than the newer Herald and Cyprus rather than the newer Parabinga.

    Some of the principle areas in eastern Libya were:

    Benghazi plain between Benghazi and Jebel al Akhdar.

    Wadi Karouba south of the jebel.

    Wadi al Bab south of the jebel.

    In the west there were many areas sown but the medic pastures at Adjulat near the Tunisian border are of the greatest interest as the rainfall is below 150 mm.