Soils and flower color

Sun, 17 May 2015 12:10:02 PDT
>It does not go into the electrostatic behaviour of clay particles. Nor does
it cover the degree drying out when wilting occurs, reducing
transpiration), and remaining soil moisture serves to maintain plants in
drought mode. That period of semi-dryness so important for bulbs lasts
longer in small particle soils than in granular, when soils are drying out
and bulbs are 'dormant'

I think I’ve read that before, and it makes perfect sense, but a climate with 100 cm of precipitation spread throughout the year. It fails to take into account the evaporative potential of intense sunlight coupled with low humidity, and long periods of drought. 
That’s why the “inverse texture effect” has been proposed to explain the greater water-delivering efficiency of coarse-textured soils in semi-arid and arid regions. Most of the water is delivered by thunderstorms. 
I’m not aware of any studies that have been done on the ecology of plants (like bulbs) adapted to heavy soils and extended drought. Are there any?
Bob Nold
Denver, Colorado USA
pbs mailing list

More information about the pbs mailing list