Wednesday, April 2, 2008

Fruit development


A fruit is a ripened ovary. After the ovule in an ovary is fertilized in a process known as pollination, the ovary begins to ripen. The ovule develops into a seed and the ovary wall pericarp may become fleshy (as in berries or drupes), or form a hard outer covering (as in nuts). In some cases, the sepals, petals and/or stamens and style of the flower fall off. Fruit development continues until the seeds have matured. With some multiseeded fruits the extent to which the flesh develops is proportional to the number of fertilized ovules.
The wall of the fruit, developed from the ovary wall of the flower, is called the pericarp. The pericarp is often differentiated into two or three distinct layers called the exocarp (outer layer - also called epicarp), mesocarp (middle layer), and endocarp (inner layer). In some fruits, especially simple fruits derived from an inferior ovary, other parts of the flower (such as the floral tube, including the petals, sepals, and stamens), fuse with the ovary and ripen with it. The plant hormone ethylene causes ripening. When such other floral parts are a significant part of the fruit, it is called an accessory fruit. Since other parts of the flower may contribute to the structure of the fruit, it is important to study flower structure to understand how a particular fruit forms.
Fruits are so varied in form and development, that it is difficult to devise a classification scheme that includes all known fruits. Many common terms for seeds and fruit are incorrectly applied, a fact that complicates understanding of the terminology. Seeds are ripened ovules; fruits are the ripened ovaries or carpels that contain the seeds. To these two basic definitions can be added the clarification that in botanical terminology, a nut is not a type of fruit and not another term for seed, on the contrary to common terminology.

Wednesday, March 26, 2008

Entering the Underwater Forest


Underwater Harvester represents the first true arrival of viable marine technology in underwater forests. Developed and manufactured by Triton, it is the world's only deep-water logging machine, combining proven elements from timber-harvesting and submarine vehicle technology on an innovative platform.
Deepwater Access The Sawfish™ not only navigates precisely by a remote pilot, it can operate to any depth. Alternative systems (grapples or divers) are limited to approximately 25 m, even though 80 percent of submerged timber resources are found at greater depths.
Economical and Efficient While alternative systems use the same mechanism to cut and retrieve trees, The Sawfish™ achieves significant efficiencies by de-coupling the cutting and surfacing processes, enabling it to perform multiple cuts without returning to the surface. And with no new roads to build and no fires or pests to control, Triton’s system becomes even more economical.
Safety Triton’s harvesting operation does not involve falling trees or working with heavy machinery in tight spaces or sloped terrain. And by removing hazardous trees from reservoirs, Triton creates safer environments for recreational and commercial use.
7000 lbs on land and slightly buoyant in water
Fully remote with 8 video cameras and sonar
Powered by a 75 HP electric motor, using biodegradable and vegetable oil-based hydraulic fluids
Feller grapple and 55-inch chainsaw
Handles larger trees than any land-based mechanical harvester due to water buoyancy
50 inflatable/reusable airbags to float trees to surface (one bag per tree)

Monday, March 24, 2008

Bees and Trees

The Green World Campaign is funding the planting of Calliandra trees in Ethiopia. These fast growing, multi-purpose trees increase soil fertility, prevent landslides and erosion, have leaves that support livestock, and turn unproductive land into agricultural fields.

And the sweetest part: of all: honeybees adore Calliandra flower pollen, supporting honey production that adds to family income. We’re also growing moringa trees, which not only heal the land but have delicious edible leaves and pods that contain up to 40 percent protein.

Thursday, March 20, 2008

What Type of Fertilizer Do I Need?

Fertilizers are made up of macronutrients (Nitrogen, Phosphorus, and Potassium) and micronutrients (such as Iron, Magnesium and Manganese). These minerals all have different effects on the growth of a tree and different trees need different formulations. It is important to ensure that you use the right fertilizer for your tree. To find out how to obtain the correct fertilizer for your trees or shrubs

Tuesday, March 18, 2008

Does My Tree Need Fertilizer?

Trees growing in their natural habitat should have access to all of the minerals they need to survive and grow. Anything you can do to mimic that habitat can reduce the need for fertilizer. This may include letting leaves remain on the ground in the fall instead of raking them up. Chances are, though, that despite your best efforts, the need for fertilizer will not be entirely eliminated.

When Should I Fertilize My Tree?
A good time to fertilize trees in most Northern temperate climates is from fall to mid-spring. At these times the tree's roots take the nutrients from the soil and apply them to important health-promoting functions such as root development and disease resistance, rather than simply putting out new growth.

During the growing season, fertilizing can help a tree overcome mineral deficiencies and fight off infections. If you are fertilizing in mid- to late summer, avoid formulations high in nitrogen as this will just promote weak, new growth that may be easily damaged in the winter.