10 Watering Tips to Give Your Lawn the Best of Care

Hi Paul,
Thanks for the great information,
I would however offer some information contrary to the "expert advice" your referenced article provided.

Useful Tips on Watering and Caring for your Beautiful Lawn:

"2.Choose the right time of the day. The best time to water your lawn is early morning from 8am to 9am and late evening from 10pm to midnight."

From a water conservation standpoint it is important to understand that no plant processes occur without the presence of photosynthesis, if you water plants during the time of 10 to midnight no water uptake by the plants will take place until the sun rises, and any water peculating below the root zone (approx. 2 inches or so) will be wasted.
In particularly loamy and rich soil this might result in minimal waste but in more sandy soil the waste could be substantial.

"it is important to understand that no plant processes occur without the presence of photosynthesis"

Umm, no. Photosynthesis is only one metabolic process of plants, and none of the other processes require photosynthesis to be occurring. In fact, plants respire all day and all night long. Like every other living organism, plants use stored chemical energy to perform their life functions (grow, transport nutrients, reproduce, etc). They do this all the time, using free oxygen from the air and the sugars that they have stored inside, and release carbon dioxide (and water). Just like all of us.

As I'm sure you know, Paul, plants can only perform photosynthesis during the day when there is sunlight to provide energy. They also respire all day long too, of course, but during the day the photosynthesis reaction produces more oxygen than the plants use for respiration, thus giving a net release of oxygen. (Well, except during the winter for trees that lose their leaves, during which time the produce no oxygen.)

So there are lots of reasons why early morning watering is better than evening (reduced chance of fungal growth for one, and the aforementioned water conservation), but "no plant processes occur without the presence of photosynthesis" isn't one of them.