Podcast
Questions and Answers
What is the wavelength range for solar radiation that crops utilize for photosynthesis?
What is the wavelength range for solar radiation that crops utilize for photosynthesis?
- 0.15 - 3.0 microns
- 0.94 - 1.5 microns
- 3 - 100 microns
- 0.4 - 0.7 microns (correct)
Which factor is NOT mentioned as an important factor in agricultural production processes?
Which factor is NOT mentioned as an important factor in agricultural production processes?
- Soil Type (correct)
- Quality
- Duration
- Intensity
What percentage of energy received at the top of the atmosphere reaches the earth’s surface after losses?
What percentage of energy received at the top of the atmosphere reaches the earth’s surface after losses?
- 47% (correct)
- 53%
- 25%
- 75%
How much of the energy incident on the crop is utilized for photosynthesis?
How much of the energy incident on the crop is utilized for photosynthesis?
Which device is used to measure sunshine hours?
Which device is used to measure sunshine hours?
What is the main process by which crops convert solar energy into chemical energy?
What is the main process by which crops convert solar energy into chemical energy?
What percentage of energy is used for heating after reaching the crop?
What percentage of energy is used for heating after reaching the crop?
What is considered as Photosynthetically Active Radiation (PAR)?
What is considered as Photosynthetically Active Radiation (PAR)?
Which instrument is primarily used to measure solar radiation at the crop canopy level?
Which instrument is primarily used to measure solar radiation at the crop canopy level?
What is the significance of spectral quality of sunlight for crop growth?
What is the significance of spectral quality of sunlight for crop growth?
Which of the following months has the highest normal number recorded?
Which of the following months has the highest normal number recorded?
What effect does solar radiation have on micro-climates?
What effect does solar radiation have on micro-climates?
Which of the following instruments is NOT mentioned as used for measuring radiation?
Which of the following instruments is NOT mentioned as used for measuring radiation?
Which month has the lowest normal number recorded in the data provided?
Which month has the lowest normal number recorded in the data provided?
What role do radiometers play in understanding micro-climatic regimes?
What role do radiometers play in understanding micro-climatic regimes?
Which month has a normal number above 13.0 but below 14.0?
Which month has a normal number above 13.0 but below 14.0?
What is the formula used to calculate temperature T based on T1, T2, and G?
What is the formula used to calculate temperature T based on T1, T2, and G?
Using the provided values, what is the calculated temperature T when T1 = 20, T2 = 15, and G = 1.79?
Using the provided values, what is the calculated temperature T when T1 = 20, T2 = 15, and G = 1.79?
At the dew point temperature of 11.05°C, what is the saturated vapor pressure according to the given information?
At the dew point temperature of 11.05°C, what is the saturated vapor pressure according to the given information?
What is the relative humidity (RH) calculated from the saturated vapor pressures at the dew point and room temperature?
What is the relative humidity (RH) calculated from the saturated vapor pressures at the dew point and room temperature?
What Glashier factor is used at a dry bulb temperature of 23°C?
What Glashier factor is used at a dry bulb temperature of 23°C?
Which calculation step directly leads to the calculation of relative humidity (RH)?
Which calculation step directly leads to the calculation of relative humidity (RH)?
If the wet bulb thermometer reads 18°C, which of the following temperature readings is incorrect based on the calculation process?
If the wet bulb thermometer reads 18°C, which of the following temperature readings is incorrect based on the calculation process?
In the calculation provided, what happens to the value of T if G increases?
In the calculation provided, what happens to the value of T if G increases?
What is the formula for calculating wind speed using an anemometer reading?
What is the formula for calculating wind speed using an anemometer reading?
How is the mean daily wind speed computed?
How is the mean daily wind speed computed?
What wind speed was calculated from the readings on 4.6.2011?
What wind speed was calculated from the readings on 4.6.2011?
If an anemometer reading at 7 hrs LMT was 4005.6 and the next reading was 4006.8, what would be the wind speed?
If an anemometer reading at 7 hrs LMT was 4005.6 and the next reading was 4006.8, what would be the wind speed?
What does an anemometer measure?
What does an anemometer measure?
What is the significance of the time 0700 hrs LMT in calculating mean daily wind speed?
What is the significance of the time 0700 hrs LMT in calculating mean daily wind speed?
What is the required difference between the two readings in order to calculate wind speed?
What is the required difference between the two readings in order to calculate wind speed?
At what local mean time is the anemometer reading observed for the mean daily speed calculation?
At what local mean time is the anemometer reading observed for the mean daily speed calculation?
What is the calculated evaporation for the day on 10.7.2011?
What is the calculated evaporation for the day on 10.7.2011?
What was the change in water level when 33 cm of water was added on 5.6.2011?
What was the change in water level when 33 cm of water was added on 5.6.2011?
What was the total evaporation for the day on 5.6.2011?
What was the total evaporation for the day on 5.6.2011?
How much rainfall was recorded at 0830 hrs on 10.7.2011?
How much rainfall was recorded at 0830 hrs on 10.7.2011?
If rainfall is recorded as 17.8 mm and 135 cm was removed, what is being calculated?
If rainfall is recorded as 17.8 mm and 135 cm was removed, what is being calculated?
What role does the 'Pocket' register serve in data recording?
What role does the 'Pocket' register serve in data recording?
What is the evaporation calculated when 65 cm of water is added and rainfall is nil?
What is the evaporation calculated when 65 cm of water is added and rainfall is nil?
What is recorded in the daily register after applying corrections?
What is recorded in the daily register after applying corrections?
Study Notes
Solar Radiation and Crop Growth
- Solar radiation significantly impacts micro-climate, crop growth, and yield.
- Spectral quality of sunlight intercepted by the crop canopy and light penetration through the canopy are critical factors.
- Measurements help assess the photosynthetic efficiency of the system.
- Instruments used for radiation measurement include line quantum sensor, net radiometer, spectroradiometer, pyranometer, and pyrano-albedometer.
Sunshine Hours and Crop Growth
- The sun provides energy for crop life within the 0.15-3.0 u wavelength range, known as shortwave radiation.
- Earth emits longwave radiation (3-100 u).
- Intensity, quality, quantity, duration, and periodicity of solar radiation are essential for agricultural production.
- Photosynthesis occurs in visible light (0.4-0.7 micron), also referred to as Photosynthetically Active Radiation (PAR).
- PAR converts solar energy into chemical energy during photosynthesis.
- Transpiration also requires a substantial amount of energy.
- Pest and disease infestations are often associated with prolonged periods of continuous cloudy days during the crop growing season.
Measuring Sunshine Hours
- Campbell-Stokes Sunshine Recorder measures the duration of sunshine.
- It measures hourly or daily totals.
- It functions by concentrating sun's rays onto a piece of paper that burns a trace.
Wind Speed Measurement
- The difference between dry and wet bulb thermometer readings (multiplied by 20) provides wind speed in kilometers per hour.
- Anemometers, calibrated in kilometers, measure wind speed.
- Mean daily wind speed is calculated at the one-hour observation time (7 hrs local mean time).
- The anemometer reading at 7 hrs LMT of the previous day is subtracted from the reading of the current day to determine mean daily wind speed.
Evaporation Measurement
- Pan evaporimeters measure evaporation.
- Water added or removed is measured along with rainfall to determine the evaporation rate.
Agrometeorological Data Management
- Agrometeorological data involves observation, transmission, storage, and analysis.
- Initial recording of observations is made on a "Pocket" register.
- Daily register records final observations after applying corrections to the raw data.
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Description
This quiz explores the critical role of solar radiation in crop growth and yield. It examines how sunlight quality and intensity affect photosynthetic efficiency and agricultural productivity. Participants will learn about the relevant measurements and instruments used in assessing solar radiation impact on crops.
