Develop your ability to select and cultivate appropriate varieties of Australian Native Trees different situations.
1. Introduction
2. Maple (Acer)\
3. Birch (Betula)
4. Ash (Fraxinus)
5. Oak (Quercus)
6. Prunus
7. Other Deciduous Trees
8. Special Project
This is an individual module course. The individual module courses are 100 hour long usually and can be taken on their own or as part of a larger program of study.
If you wish to take an individual module course as a stand alone course, you can elect to sit an optional exam at the end of it.
If you successfully pass the exam and all assignments, you will receive a Statement of Attainment. You can take examinations at a time and location to suit you. If you enrol, you will be sent further information on how to arrange examinations at the end of the course.
If you do not wish to take the exam, you will receive a Course Completion letter when you have passed all assignments.
There is an assignment at the end of each lesson. So for example, if an individual module course contains ten lessons, you will need to complete ten assignments. Assignments can be sent to us via email, post or fax.
Other qualifications, such as certificates, diplomas etc may require examinations to be taken as part of the overall assessment process.
You can find further information on the examinations process by clicking on the “Enrolment” link above.
You can find further information on other courses by clicking on the “Courses” link above.
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Extract from the Course:
WHAT MAKES FOLIAGE CHANGE COLOUR IN AUTUMN?
Deciduous plants shed their leaves in autumn or early winter, and are fully or partially devoid of foliage over the colder months of the year. This is an adaptation that allows the plant to better survive unfavourable conditions (such as extreme cold).
Prior to leaves dropping they undergo a period of senescence.
Senescence is the period during which leaf cells progressively die.
Over this senescence period, tissue at the leaf base progressively dies, until finally a complete section of tissue between the leaf and the stem is dead (At this point there is nothing left to hold the leaf to the stem; so it detaches and drops to the ground).
As senescence occurs, the amount of chlorophyll in the leaf (which gives it the normal green colour) reduces. Chlorophyll is actually only one of many pigments that generally occur in leaves; but it is usually the strongest pigment, and for that reason alone, most leaves usually appear green if the plant is healthy.
Other types of pigment chemicals commonly found in leaves include:
- Anthocyanins –Reds, Blues and Purples
- Carotenoids –Yellows and Oranges
Generally Carotenoids also decompose rapidly in Autumn, but Anthrocyanins break down much more slowly.
Often Anthrocyanins can still be at close to 100% normal levels when only 40% of normal chlorophyll and carotenoids remain.
Anthrocyanins are produced through chemical processes, from excess sugars in the leaves, particularly in the presence of bright light. In view of this fact; the level of anthrocyanins will be stronger if the plant has been actively photosynthesising (producing sugars) over summer, combined with lots of bright autumn days (if weather is frequently overcast and dull in late summer and autumn; the production of anthrocyanins is decreased).
Lower temperatures in autumn reduce the movement of sugar around the leaf, so if the weather changes from warm to cool fast, the leaf sugar remains high and anthrocyanins build up; otherwise the levels of these pigments might not be so high.
High levels of anthrocyanins will generally result in more vivid autumn foliage colours.
ENROL NOW AND BECOME A DECIDUOUS TREE EXPERT
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