by Did67 » 02/07/17, 10:02
Are you sure it's the temperature of the ground ??? It plays on the growth of the roots and the development of the plants, that's for sure: my tomatoes planted early have stagnated and vegetated for almost 2 months, with leaves that turn blue, a sign of a phosphorus deficiency, itself a sign roots that do not explore because they do not grow ... The tomato is, from this point of view, to be considered as a "tropical" plant which needs a warm soil ... Indirectly, of course , the lack of development will result in a delay in flowering. But about the rate of flowers which fertilize, I don't know?
Conversely, above a certain temperature air, fertilization no longer takes place: it is difficult to grow tomatoes in tropical conditions. The day / night temperature alternation plays a role. When the temperature is high and fairly stable, it plummets (I had experienced this in Chad, where production was only good in "cool" seasons - this corresponds, in central Chad to + 30 ° in the shade. during the day and another 10 to 15 at night! -; I observed this during the heatwave in my greenhouse, which was then close to 50 °).
Of course, foragers play a role: in intensive cultivation in greenhouses, bumblebees are introduced. The suspended threads are "shaken" by shakers to promote self-fertilization: the pollen falls on the pistil in the leaf (it would seem that these "shakes" are one of the effective roles of bumblebees!)
0 x
and it's DAMAGE considering the richness of all this unfortunately scattered content
that makes one more reference ... it's true that Damien is rather 
cool
,