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Transcript
First Grade New Plants FOSS Plant Care Notes Brassica Seeds In the New Plants Module, brassica is used as an example of a typical flowering plant. By providing ideal (albeit unnatural) conditions of perfect nutrition and continuous light, students can observe germination, leaf formation, budding, flowering, and seed development in a few weeks rather than a few months. This brassica is completely dependent on continuous cool light, or it will fail to grow at all. Cool does not refer to the temperature, but rather to the color of the light. Brassica needs light that is strong in the blue (cold) wavelengths of light, rather than the red (warm) wavelengths. For this reason, if you need to replace a fluorescent lamp in the light source, specify a cool bulb. Brassica grows best when it is kept moist and well fertilized. To do this we suggest putting water in the tray in which the planter cups stand. The water will soak up into the cups. Add water only after all of the water has been soaked up (or evaporated). At that time add four drops of liquid fertilizer to 1/2 liter of water and pour it into the tray. The light that falls on the brassica plants should be as intense as possible. Therefore the distance from the bulbs to the plants should be between 3 and 7 cm (between 1"and 3")—never more than 8 cm (31/4"). As the plants grow, the lamp should be raised using the chainand-hook system. Other than that, just keep the soil moist, and you can almost watch the plants grow. The Brassica rapa seeds were developed at the University of Wisconsin and are widely used in education at many levels. There is a phone hot line in Wisconsin for teachers who are using the seeds and have questions about their growth or need more information for extension activities. That hot line is 1-800-462-7417. The website is www.fastplants.org. BULBS Bulbs are most often found in the subterranean world along with roots, but are not roots themselves. A bulb is a short piece of stem with a bud at one end and roots at the other. Around the bud is a compact capsule of modified leaves. The leaves are thick with water, sugars, and starch. The aerial parts of the plant can die back completely at the end of a growing season, leaving the bulb underground to nourish and protect the bud that will produce next year's plant. Some bulbs, like onions, garlic, and shallots, start growing whenever moisture is provided. Others start growing only after they have been cold for awhile and then warm up. Such a triggering mechanism is essential to the survival of plants that live in areas that experience hard freezes during the winter. Bulbs that normally bloom in the spring can be induced to start their growth early, providing bright, fragrant flowers in the dead of winter. Fooling bulbs into growing early by putting them in the refrigerator for a few weeks in the fall is called forcing and is a common practice with hyacinths, tulips, and daffodils and their relatives.