Re: The great water parady

>Brock:
>
>You pose two interesting questions......when stomates open and close
>relative to CO2 usage and O2 evolution and also whether its best to water
>at night or during the day.  Believe it or not the two are unrelated.
>
>The greatest dilema plants face is that they have to absorb sunlight when
>its sunny out.    Plants really don't want to open their stomates at all
>because when they do they loose water.  Even if its 100% RH outside the
>plant will still loose water by opening its stomates.  But in order to
>photosythesize they need to have a supply of CO2 and be able to exhale O2
>gases.   During the day the stomates have to reluctantly open in order to
>allow photosynthesis to occur.  Some of the Light independant parts of the
>process will occur and night, so that some stomates are occassionally open
>to allow CO2 in.  I hope this answers the question.
>
>As far as when to water most growers will agree that early in the AM is
>best, unless you are misting for evaporitve cooling.  The only reason why
>AM is best is because it gives the leaves the best opportunity to dry off
>before sunset.  Wet leaves at sunset set you up for disease problems.  Many
>fungal and bacterial diseases need free moisture to infect your plants.
>
>Water spots concentrating light and buring the leaves is an unfounded wives
>tale, don't buy this  line from anyone it simply doesn't happen.
>
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Rick thanks for the quick reply!  So if the stomates seem to be reluctant
to open then the plant stomates would really be reluctant during a hot day
thats kinda what i am thinking..... thinking that plants are very oriented
to adaption like little computers that can change things to help there
survival..so who knows what there doing at night.....some farmers think
that pumpkins like a little stress .....it triggers something,,I am not too
sure...,but if the plant is relunctant to open its stomates because of fear
of evaporation then the most important factor is sufficient water to help
the plant be more relaxed or comfortable opening its stomates and sucking
more Co2 ........Rick what do think of drip line watering at night?  I know
the wetness on the leaves can be trouble............but water water water
seems key!!!......... now heres a plan that i would love to try  With the
increase water  the soil would have breathing probs so what if you put
perferated pipes down under for more air..........I think we need to get
research grants to further the cultural studies of the giants.......brock


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