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Diapositiva 1

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Title: Diapositiva 1 Author: Antonella Morea Last modified by: squartini Created Date: 6/28/2011 4:50:49 PM Document presentation format: Presentazione su schermo – PowerPoint PPT presentation

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Title: Diapositiva 1


1
How fertile is your soil?
Stick a Fertimeter in it and watch
2
Snap !
3
An indicator stick got released and popped up
A silk filament has broken in the soil
4
What happened?
5
Soil contains bacteria and fungi
The more they are, the more they work
The more they work, the more organic matter is
mineralized and nutrients are released for the
plant roots
The faster they work, the more your soil is
FERTILE
6
How does it work inside?
And the indicator stick pops up
The threads are kept in tension by springs
When microbes in soil have chewed off half of
the resistance of the thread it breaks
7
There are six threads
Three are made of cotton Cellulose
(Plant fibers)
Three are made of silk Proteins
(Animal fibers)
1) Silk 2) Silk Nitrogen (was soaked in
NH4NO3) 3) Silk Phosphorus (Was soaked in
Na2HPO4 KH2PO4)
1) Cotton 2) Cotton Nitrogen (was soaked in
NH4NO3) 3) Cotton Phosphorus (Was soaked in
Na2HPO4 KH2PO4)
8
1) Cotton 2) Cotton Nitrogen
What are the threads N and P for?
Bacteria are made of Carbon, Nitrogen,
Phosphorus etc..
Cotton cellulose carbon
One bacterium chews cotton and gets carbon to
make a second bacterium
But it takes also N to build its sister cell
It can find N in the soil
Now two cells chew the carbon thread TWICE AS FAST
9
1) Cotton 2) Cotton Nitrogen
But what if the soil is POOR in Nitrogen
The earlier the thread with N will break in
comparison to the one without it, the more your
soil needs nitrogen
The bacterium can not reproduce
X
The same concept applies to Phosphorus and tells
you if your soil needs P
But if there is N on the thread
IT CAN
Cotton reports on the cellulosolysis and silk on
the proteolytic activities, The combined
information gives you a full insight on organic
matter mineralization in your soil
And the thread with N will BREAK EARLIER THAN THE
ONE WITHOUT IT
10
Your result
What do you record?
At which time from planting has each thread
broken?
Interpretive Chart
Did the thread Nitrogen (or Phosphorus) snap
earlier that the one without nutrients? How much
earlier?
11
Thread n. 3 in Fertimeter unit n.24 in field
n.12 has snapped at 12.33 p.m.
Wireless sensing evolved version Instead of
indicator sticks, it mounts a transducer sending
data to a PC
12
Thank you for your attention
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