Explain why we don't water plants when strong sun light is present
2007-09-21 19:58:33 · 4 answers · asked by harry4 2 in Science & Mathematics ➔ Physics
duh.
i think that your not supposed to water plants when the sun is strong because the water acts as a magnifying glass on the leaves and it actually damages the plant that you were trying to help.
2007-09-21 20:07:43 · answer #1 · answered by Kurtis J 2 · 0⤊ 1⤋
Because radiant heat from the sun is absorbed by the water. Every 540 joules that are absorbed causes a loss of 1 gram of water(1mL). If you water before or after the times when the sun is strong then you can avoid the IR absorbtion period. Also, the Delta T will be less (Newtons Second Law). This will cause the water to take longer to heat up before it gets to the point of vaporization in the first place.
Overall. I would estimate that you would need to use twice as much water at noon as you would need to use at 6:00 pm or 6:00 am to have the same amount absorbed in the soil and plants. That's half the efficiency of watering during cooler hours.
2007-09-21 20:39:07 · answer #2 · answered by Anonymous · 0⤊ 0⤋
The plants will not have enough time to absorb the water and the sun light dries out the leaves and the soil fast. So, watering at cooler hours is better.
2007-09-21 22:08:15 · answer #3 · answered by Swamy 7 · 0⤊ 0⤋
yeah...
I'm pretty sure thats common knowledge...
always water your yard in the evening...
2007-09-21 20:12:18 · answer #4 · answered by Anonymous · 0⤊ 1⤋