Miyerkules, Oktubre 3, 2012

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Seed Propagation

INTRODUCTION

I. METHODS OF PROPAGATION

A. SEEDS OR SEXUAL PROPAGATION



  • Crown: has well-balanced crown



  • Strong and hardy trunk/bole

  • Regularity in bearing fruits
  • High yield
  • Free from pests and diseases
    • - excellent eating quality
    • - skin that easily peels off and does not adhere to flesh
    • - seeds that does not also adhere to flesh
Know a healthy seedling when you see one

  • It is free from diseases such as abnormal development and discoloration of plant parts.

  • It has a relatively thick or woody stem.

  • For a bareroot seedling, it has a firm and fresh rootsystem with many rootlets.
Ensure healthy seedlings thru proper procedures/ technologies
Healthy seedlings can be produced through proper procedures and technologies.
Seed Collection

  • (Diospyros philippinensis), Santol (Sandoricum koetjape), Mahogany (Swietenia macrophylla), and Katmon (Dillenia philippinensis).

  • Collection from standing trees
  • (Vitex parviflora), Bagras (Eucalyptus deglupta), Agoho (Casuarina equisetifolia), or Banaba (Lagerstroemia specbsa).





  • (Refer to Seed Collection Calendar in Annex A)
Seed Processing

  • Floatation


  • Winnowing or Blowing


  • Screening or Sieving


  • Sorting

Seed Testing
  • Viability test. This is done by germinating randomly sampled seeds using appropriate pre-germination treatment to determine how many will germinate.
  • Seed health test.
Seed Storage and Handling
Seed storage is a technique where seeds are kept under favorable environmental conditions to maintain seed viability. This is to keep excess viable seeds for future use when seeds are no longer available for collection.

(Refer to Annex B for moisture content determination)




Seed Germination
  • Treatment before germination
    • breaking of hard seed coats
    • cold water soak
    • hot water soak
    • alternate hot and cold water soak
    • dry heat treatment

  • (Refer to Annex C for Seed Technology)
  • Methods of sowing
    1. Sowing in seedboxes
    2. Direct sowing or sowing in seedbeds
  • Preparation of potting materials

    • apply chemical disinfectant (fungicide)
    • pour boiling water

  • Transplanting
    1. Seedlings from seedboxes or seedbeds






    2. Wildlings






B. VEGETATIVE OR ASEXUAL PROPAGATION
Instead of seeds, this method of propagating trees uses plant parts, such as stems, leaves, roots, twigs, single cells, and tissues as initial material. This is done especially in plants that do not fruit regularly (seed-off) or when earlier fruiting is desired.
(Pterocarpus indicus), Mahogany (Swietenia macrophylla), Yemane (Gmelina arborea), dipterocarp and bamboo species . Grafting, marcotting and budding are used for most fruit trees such as Pomelo (Citrus grandis), Santol (Sandoricum koetjape), and Mango (Mangifera indica).




  • For root containers, plastic hiko tray or plastic bags filled with rooting media can be used.









    10. Plant each in a plastic pot of mixed garden soil and river sand.


Grafting
  • Hasten reproductive maturity of seedlings
  • Establish clonal seed orchards, clonal tests and clonal banks
  • Obtain benefits of rootstocks.











Marcotting







Budding
  • Shield Budding. This is widely used on citrus.
    Procedure:






  • Patch Budding. This is widely used on fruit trees with thick bark.
    Procedure:








Tissue Culture
Tissue culture can produce a larger number of quality seedlings. This method however, is more expensive.



  1. Sterilize young shoots using disinfectants.





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