Introduction Plant propagation structures plays vital role in propagation of various seedlings and grafts in nurseries. These structures helps to maintain.

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Presentation transcript:

Introduction Plant propagation structures plays vital role in propagation of various seedlings and grafts in nurseries. These structures helps to maintain congenial climatic conditions for better germination, easy rooting and hardening of seedling. Plant propagation structures helps the successful and healthy production of seedlings. Plant Propagation Structures in Nursery: 1.Poly-houses 2.Net houses 3.Plastic tunnels 4.Mist Chambers

Poly-house Poly-house is widely used for prorogating off season seedlings which fetch better price in the market. Modern poly-house are automated for temperature and humidity control to assist propagation In poly-houses, plant are propagated using pro-trays or poly- bags on ground or benches. In Poly-houses, thermostat, hygrometer, automatic ventilation system is maintained to facilitate micro-climate. Irrigation and fertigation systems in poly-houses is automated to provide measured quantity of water and nutrients to plants.

Poly-house Structure for Nursery Net house Structure for Nursery Polyhouse

Net House Net houses are widely used as propagation structure in tropical areas, where artificial heating is not required and artificial cooling is expensive. The roof of net house may be covered with gunny cloth or even with live plant creeper to cut off the solar radiation and to keep the house cool. Different type of shade nets are available in the market for shade purpose. Net houses can be constructed as per need of propagation and therefore its size of net houses varies.

Plastic Tunnels Plastic tunnel is a simple but effective method of protective cultivation, used by many nurserymen throughout the world. The three feet wide loops which support the polyethylene are made from 0.2 inch diameter wire and are erected at 30 inches intervals. A white translucent polyethylene sheet of 6 feet wide is then stretched over the loops and is fastened to the frame of the tunnel. Plastic tunnels prove effective for seed germination as well as vegetative propagation of nursery plants in winter season.

Plastic Tunnels Plastic Tunnels Used in Nursery

Mist Chamber Nursery plants propagated by cuttings are grown in mist chambers. In Mist Chamber, Relative humidity is maintained artificially at high level (95 %) with the help of mist installations, which spray water under pressure. High relative humidity facilitate better root initiation and cooling effect prevents the cutting from drying out.

Mist Chamber Mist Chamber Used in Nursery

Advantages This method results in faster rooting of the cuttings. Create optimum Microclimate for better root initiation and development. Higher success rate found in propagation of hard wood cuttings. Disadvantages Hardening of rooted cuttings is more difficult and requires careful attention. Selection of right medium is very important. Under mist conditions oxygen deficiency can create problem. Mist Chamber