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I can report. I had to destroy to do this not even a sheet. Last year had planted 2 22 g tubers in equal standing side by side pots. One of the bulbs pushed 2 leaves, where the 2nd right came early, the other only a sheet with wider pinnae (no IG). She made it with 2 leaves on 220 g, with only only on about 140-150 g (for accurate weight I have to look after).

I would not draw but still conclusions from this. For this, the sample is too small.

Hello Olvi, Hello Cistbeetle,

what crap beetles describes is exactly what I would expect.

To make a large tuber, it takes a lot of assimilation products, which basically all go back to photosynthesis.
And for that, leaf space is needed; the more leaf area, the more photosynthesis and assimilation.

Therefore, a plant with more leaves will also lead to thicker tubers.
The effort to make more leaves is certainly overcompensated by the increased photosynthesis and assimilation over the growing season and leads to thicker tubers than with just one leaf.

Olvi, with me or with my IG, the three to four leaves have already grown rel early in the year and there is therefore a lot of time until autumn or until the first frost to supply the tubers with photosynthesis products, so that they can form a lot of mass.

Happy growing, Bernhard.

Hello Olvi,

did I understand correctly that you calculated the values from the start and end weight, time and number of leaves in a time-pro-rata manner?
I suspect, however, that on the one hand the performance of the leaves decreases sharply in old age (a leaf is only a human) and of course the light supply becomes less later in the year, which would probably change the table a lot. I usually have no problem in autumn to cap leaves early.
Nevertheless, an interesting overview, thank you for taking the trouble. To prove this with a test series would be great (smaller hint to you Klaus with your billions of maturing seeds!)

Michael

Hello Olvi,
100g that would be 3 kg per month vegetation phase! That's a nod! At Amo titanum this is certainly possible, but the leaf surface also goes into the square meters...
Michael

Hello Olvi,

interesting considerations and an interesting model!

I can think of the following:

1. I think that Wilbert Hetterscheid once said that the old tuber is not eaten up in a compute. Typhonium venosum in its original state?
This would mean that only a part of the old tuber is needed to make roots and the first leaf.
I cannot assess whether the first is enough to supply the substances that make the second leaf; possibly also material from the old tuber is needed for this.
But for the overall view about the vegetation period, both are actually not important....

2. The daily growth should actually be relatively easy to determine.
To do this, one would have to weigh the pot after pouring on flow, so the substrate is always water-saturated. The difference from the previous day should then be the mass increase of the tuber.
If you want to do this over a later time, however, the pot should certainly be quite large, since a growing tuber compacts the substrate and thus reduces the pore volume of the substrate, i.e. the maximum water holding force.

3. Influence of temperature and light
The heat sum certainly goes in, but I don't know how that can get into a model.
In the case of light, it is probably the case that a minimum exposure strength is necessary for the assimilation to exceed the dissimilation and that from a certain exposure strength a further increase of the same no longer results in an increase in photosynthesis performance.
Unfortunately, I can't give details, because the study was just too long ago....
I think that such models certainly already exist for cereal crops; if I find the time, I will inquire.

OK, just Aunt google tries:
https://www.gabot.de/ansicht/forscherung... elt-241629.html
https://www.haz.de/Hannover/Aus-der-Stad... au-simplify
Whether the Program Progkoli is freely available, I can ask....
I can also ask if there is a similar one for tuber vegetables (e.g. kohlrabi or agricultural tuber or beet crops).

Happy calculating/modelling, Bernhard.

««Originally posted by» musa»

100 g that would be 3 kg per month growing season!

And 9 kg in 3 months. So much longer the growing season in my Venosums did not take in the last few years. They were recovered about 3.5 months after the full development of the first sheet. Oh yeah, Bernhardt reached tubers weights again and again to 9 kg at its IGs. I don't know how long was the period of vegetation in these plants.

Taking into account that at the beginning of the vegetation period while other leaves are formed, the formation of tubers is certainly curbed and that look similar at the end due to shorter days with low light intensity and lower temperatures may, 100 g increase of in tuber weight per day are at least temporarily no longer unrealistic.