palmzaad kiemen in 1,5 tot 2,5 week.

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#1 za, 21/10/2006 - 23:15
satmeel

palmzaad kiemen in 1,5 tot 2,5 week.

Gevonden op internet:

Germinating Palm Seeds
Getting palm seed to germinate can be frustrating and painfully slow. It can take months - or even years for some species. Are there ways to speed up the process? ... Yes!

Chuck Huxford, of The Creative Native, brought to my attention a paper entitled Promoting the Rapid Germination of Needle Palm Seed, published in The Proceedings of the Florida State Horticultural Society no. 106 in 1993 by William J. Carpenter, Eric C. Ostmark, and Kathleen C. Ruppert.

Through their experiments, the researchers identified two different methods, which yielded high germination (80% to 98%) in a short time (1-1/2 to 2-1/2 weeks). The procedures used were very exacting and were described in great detail. But, they can be summarized simply as follows:

METHOD 1

Surface sterilize and rinse the seed. Using a sharp knife, remove the embryo cap (a little bump on the side of the seed.) Germinate in a sterile soiless medium at 30 deg C.

METHOD 2

Presoak the seed for 7 days in distilled water, changing the water daily. Germinate in a sterile soiless medium, maintaining a daily temperature cycle of 6 hours at 40 deg C, followed by 18 hours at 25 deg C.

https://goo.gl/smfpsS

za, 21/10/2006 - 23:55
Anoniem (anoniem geplaatst)

Dit gaat dus op voor 1 palmsoort en wat hier weggelaten is, is dat het zaad daarvoor al 12 maanden een speciale behandeling ondergaan heeft:

Résumé / Abstract
High synchrony, rate, and germination of needle palm [Rhapidophyllum hystrix (Pursh) H.A. Wendle & Drude] seeds were achieved only after removing the sclerotesta and embryo cap, which imposed physical dormancy. After scarification, recently harvested seeds or seeds stored for 12 months at SC and 100% relative humidity had 96% and 98% final germination (G), with 9 to 11 days required to achieve 50% of final germination (T[50]) at 30C. Germination temperature controlled G, T[50], and days between 10% and 90% of final germination (T[90]-T[10]) of scarified seeds, with respective values of 98%, 9 days, and 5 days at 30C, and 18%, 31 days, and 12 days at ISC [...]

Ruud

zo, 22/10/2006 - 00:16
satmeel

Hallo Ruud,

heb je dat uit dezelfde publicatie? Kun je me vertellen waar ik het volledige onderzoek kan vinden?

Misschien is het toch een keer de moeite van het proberen waard. Ik wil het in ieder geval eens proberen met de eerste methode. De 2e is me qua temperatuur wat te lastig.

Alvast bedankt,

Paul

zo, 22/10/2006 - 00:44
satmeel

Wat ik er van begrijp is dat het allemaal gaat om het zogenaamde ontwaken van de zaden uit hun slaapstand.

Het volgende artikel (helaas Engels) verklaart hier meer over. Eenmaal ontwaakt, zal het zaad snel kiemen. Bovengenoemde publicatie stelt als voorwaarde redelijk vers zaad of zaad dat 12 maanden onder bepaalde condities is bewaard.

Seed dormancy is nature's way of setting a time clock that allows seeds to initiate germination when conditions are normally favorable for germination and survival of the seedlings. For example, dogwoods produce mature seeds in the fall, but conditions are not suitable for seedling survival at that time. Thus, dogwoods have developed a mechanism that keeps the seeds dormant until spring when conditions are favorable for germination, as well as, seedling growth and survival.

Viable seeds that do not germinate are said to be dormant. Dormancy can be regulated by the environment or by the seed itself. If a seed is not exposed to sufficient moisture, proper temperature, oxygen, and for some species light, the seed will not germinate. In this case, the seed's dormancy is due to unfavorable environmental conditions. On the other hand, some seeds may not germinate because of some inhibitory factor of the seed itself. This particular kind of dormancy consists of two general types:

seed coat or external dormancy
internal (endogenous) dormancy
Techniques to Break Dormancy

Seed Scarification -- Seed coat (external dormancy) results from a seed's hard seed coat that is impervious to water and gases. The seed will not germinate until the seed coat is altered physically. Any process of breaking, scratching, or mechanically altering the seed coat to make it permeable to water and gases is known as scarification. In nature, this often occurs by fall seeding. Freezing temperatures or microbial activities modify the seed coat during the winter. Scarification can also occur as seeds pass through the digestive tract of various animals.

Scarification also can be forced, rather than waiting for nature to alter the seed coats. Commercial growers scarify seeds by soaking them in concentrated sulfuric acid. Seeds are placed in a glass container and covered with sulfuric acid. The seeds are gently stirred and allowed to soak for 10 minutes to several hours, depending on the species. Various reference books provide appropriate concentrations and durations of treatment. When the seed coat has been modified (thinned), the seeds are removed, washed, and sown. Sulfuric acid can, however, be very dangerous for an inexperienced individual and should be used with extreme caution! Vinegar is safer (but less effective treatment) and can be used for species that do not have an extremely hard seed coat; the technique is the same as with sulfuric acid.

For mechanical scarification, seed coats can also be filed with a metal file, rubbed with sandpaper, nicked with a knife, or cracked gently with a hammer to weaken the seed coat. Another method is hot water scarification. Bring water to a boil (212oF), remove the pot from the stove, and place the seeds into the water. Allow the seeds to soak until the water cools to room temperature. Remove the seeds from the water and sow.

ma, 23/10/2006 - 14:26
JP.Bosch

Hallo Satmeel,
Is juist hoor wat Ruud zegt.
De versheid van het zaad is zeer belangrijk,ongeacht wat men schrijft,daarnaast zou ik je toch willen zeggen dat je de samenstelling van de grond,vochtigheidsgraad en de konstante temperatuur niet mag uit het oog verliezen.
Groetjes,JP

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