A. Practical implementation
Practicum undertaken at :
Day: Wednesday
Date: 6 November 2013
Place: Garden of practice Wedomartani
Date: 6 November 2013
Place: Garden of practice Wedomartani
B. Purpose
Knowing how to measure the intensity of light
C. Basic Theory
The light intensity is the amount of energy received by a plant per unit area and per unit time (cal / cm 2 / day). Definition of intensity here has included in it a long time irradiation, the sun shines long in one day, because of the time using the unit.
The magnitude of the intensity of light received by the plant is not the same for every place and time, as it depends :
1 The distance between the sun and the earth, for example in the morning and afternoon of lower intensity than during the day because the sun farther distances.
2 Depending on the season, for example, in the rainy season intensity lower than during the dry season.
3 Geographical location, for example in the area of mountainside north / south lot more intensity than the west / east less intensity because of the west / east long penyinarannya shorter due to obstructed by mountains.
Effect of light intensity on the growth and development of plants is closely linked to the process of photosynthesis. In this process light energy necessary for the ongoing unification of CO2 and water to form carbohydrates.
To measure the level of illumination (strong light) used an instrument called the luxmeter. Luxmeter is a tool used to measure the strong lighting (illumination level) in a particular area or region (Anonymous, 2013).
The magnitude of the intensity of light received by the plant is not the same for every place and time, as it depends :
1 The distance between the sun and the earth, for example in the morning and afternoon of lower intensity than during the day because the sun farther distances.
2 Depending on the season, for example, in the rainy season intensity lower than during the dry season.
3 Geographical location, for example in the area of mountainside north / south lot more intensity than the west / east less intensity because of the west / east long penyinarannya shorter due to obstructed by mountains.
Effect of light intensity on the growth and development of plants is closely linked to the process of photosynthesis. In this process light energy necessary for the ongoing unification of CO2 and water to form carbohydrates.
To measure the level of illumination (strong light) used an instrument called the luxmeter. Luxmeter is a tool used to measure the strong lighting (illumination level) in a particular area or region (Anonymous, 2013).
D. Tools and Materials
1. Plant kale
2. The gauges light intensity (Light meter)
E. How it Works
1. In luxmeter operate or run very simple. In use should be properly addressed because sensornyalah sensor is a device that will measure the illumination of a light. Therefore, the sensor should be placed on the area to be engraved power level of light (illumination) is appropriate for the results shown were accurate. The procedure for using this tool are as follows:
a. Shifts the "off / 0n" On direction.
b. Select the range to be measured range (2,000 lux, 20,000 lux or 50,000 lux) at the Range.
c. Directing the light sensor by hand on the surface area to be measured strong illumination.
2. Measure the intensity of light on plant kale.
3. Measure the canopy above and below the canopy of leaves.
4. Record the intensity, by making 6 samples (3 samples on kale plants with spacing of 10 cm x 10 cm and 3 samples on kale plants with a spacing of 15 cm x 15 cm).
a. Shifts the "off / 0n" On direction.
b. Select the range to be measured range (2,000 lux, 20,000 lux or 50,000 lux) at the Range.
c. Directing the light sensor by hand on the surface area to be measured strong illumination.
2. Measure the intensity of light on plant kale.
3. Measure the canopy above and below the canopy of leaves.
4. Record the intensity, by making 6 samples (3 samples on kale plants with spacing of 10 cm x 10 cm and 3 samples on kale plants with a spacing of 15 cm x 15 cm).
F. Practical results
1. Measurement of light intensity on kale plants with spacing
Samples
|
10 cm x 10 cm
|
15 cm x 15 cm
|
||
Upper leaves
|
Down leaves
|
Upper leaves
|
Down leaves
|
|
I
|
700 lux
|
520 lux
|
638 lux
|
223 lux
|
II
|
740 lux
|
617 lux
|
672 lux
|
340 lux
|
III
|
757 lux
|
607 lux
|
688 lux
|
603 lux
|
G. Discussion
In observational measurement of light intensity on spinach crops that is carried out at 2 in the Embankment Embankment with spacing of 10 cm x 10 cm and 15 cm x 15 cm 3 samples taken every Embankment to itensitas light observation, measurement itensitas way to measure light in the canopy of leaves and under the canopy of leaves.
With a spacing of 10 cm x 10 cm at the canopy of leaves is the first sample of 700 lux, a second sample of 740 lux, and a third sample of 757 lux. At the leaf canopy is the first sample of 520 lux, the second sample of 617 lux and 607 lux of the third sample.
To measure the intensity of light on spinach plants with spacing of 15 cm x 15 cm at the canopy of leaves is the first sample of 638 lux, a second sample of 672 lux and 688 lux of the third sample. At the leaf canopy is the first sample of 223 lux, the second sample of 340 lux and 603 lux of the third sample.
With a spacing of 10 cm x 10 cm at the canopy of leaves is the first sample of 700 lux, a second sample of 740 lux, and a third sample of 757 lux. At the leaf canopy is the first sample of 520 lux, the second sample of 617 lux and 607 lux of the third sample.
To measure the intensity of light on spinach plants with spacing of 15 cm x 15 cm at the canopy of leaves is the first sample of 638 lux, a second sample of 672 lux and 688 lux of the third sample. At the leaf canopy is the first sample of 223 lux, the second sample of 340 lux and 603 lux of the third sample.
H. Conclusion
From the above observations it can be concluded that the results of the intensity of the light on top of the leaf canopy is larger than under the leaf canopy as canopy of leaves to get the intensity of light (the sun) is directly compared with the underside of the leaf canopy.
I. Bibliography
Anonymous. 2013, Practical Handbook of Engineering Fundamentals Cultivation
Plants. Faculty of Agriculture UPN "Veteran" Yogyakarta.
Plants. Faculty of Agriculture UPN "Veteran" Yogyakarta.
Yogyakarta.
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