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Horticulture Principles and Practices

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(a)<br />

(b)<br />

FIGURE 9–12 (a) Sowing seed in flat. (b) Covering seed in flat. (Source: For (a) Dave King © Dorling Kindersley, (b) Paul Goff © Dorling Kindersley)<br />

FIGURE 9–13 Sowing seed<br />

in cavity tray. (Source: Peter Anderson<br />

© Dorling Kindersley)<br />

9.15.5 AFTER-SOWING CARE<br />

Mechanized sowing by mechanical seeders (plug seed production) has revolutionized<br />

the bedding plant industry. However, sowing certain popular seeds such as zinnia <strong>and</strong><br />

marigold is problematic because of anatomical features that interfere with the<br />

process.<br />

Moisture<br />

Seeds should be watered immediately after sowing, using a fine mist of a fine-spray<br />

nozzle to apply water to avoid washing seeds away or burying them too deeply.<br />

Excessive moisture is undesirable. Where possible, the container may be watered from<br />

the bottom (subirrigation) by placing the flat in water. If cavity seeding trays are used,<br />

the water may be added to the bottom of the holding tray. The flat may be covered with<br />

a pane of glass or plastic sheet to retain moisture in the soil. It is important to keep the<br />

soil surface moist throughout the germination period until seedlings emerge. A seed will<br />

die if allowed to dry after imbibing water or initiating sprouting.<br />

9.15 Seed Nursery Activities 307

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